Technical Exhibit G-Div 06 WOOD-PLASTICS-AND COMPOSITES 23 May 2023.pdf

MOTCO Job Order Contract (SATOC) 2487

SECTION TABLE OF CONTENTS

DIVISION 06 - WOOD, PLASTICS, AND COMPOSITES

SECTION 06 10 00

ROUGH CARPENTRY

PART 1 GENERAL

1.1 REFERENCES

1.2 SUBMITTALS

1.3 DELIVERY AND STORAGE

1.4 GRADING AND MARKING

1.4.1 Lumber

1.4.2 Structural Glued Laminated Timber

1.4.3 Plywood

1.4.4 Structural-Use and OSB Panels

1.4.5 Preservative-Treated Lumber and Plywood

1.4.6 Fire-Retardant Treated Lumber

1.4.7 Hardboard, Gypsum Board, and Fiberboard

1.5 SIZES AND SURFACING

1.6 MOISTURE CONTENT

1.7 PRESERVATIVE TREATMENT

1.8 FIRE-RETARDANT TREATMENT

1.9 QUALITY ASSURANCE

1.9.1 Drawing Requirements

1.9.2 Data Required

1.9.3 Plastic Lumber Performance

1.10 CERTIFICATIONS

1.10.1 Certified Wood Grades

1.10.2 Indoor Air Quality Certifications

1.10.2.1 Adhesives and Sealants

1.10.2.2 Composite Wood, Wood Structural Panel and Agrifiber

Products

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 Virgin Lumber

2.1.2 Natural Decay- and Insect-Resistant Wood

2.1.3 Plastic Lumber

2.1.3.1 Shear Parallel to Length

2.1.3.2 Density

2.1.3.3 Compressive Strength

2.1.3.4 Flexural Strength

2.1.3.5 Tensile Strength

2.1.3.6 Coefficient of Thermal Expansion

2.1.3.7 Screw Withdrawal

2.1.3.8 Nail Withdrawal

2.2 LUMBER

2.2.1 Structural Lumber

2.2.2 Framing Lumber

2.2.3 Structural Glued Laminated Timber

SECTION 06 10 00 Page 1

2.3 PLYWOOD, STRUCTURAL-USE, AND ORIENTED STRAND BOARD (OSB) PANELS

2.3.1 Subflooring

2.3.1.1 Plywood

2.3.1.2 Structural-Use and OSB Panels

2.3.2 Combination Subfloor-Underlayment

2.3.2.1 Plywood

2.3.2.2 Structural-Use Panel

2.3.3 Wall Sheathing

2.3.3.1 Plywood

2.3.3.2 Structural-Use and OSB Panels

2.3.4 Roof Sheathing

2.3.4.1 Plywood

2.3.4.2 Structural-Use Panel

2.3.5 Diaphragms

2.3.5.1 Plywood

2.3.5.2 Structural-Use and OSB Panels

2.3.6 Shear Walls

2.3.6.1 Plywood

2.3.6.2 Structural-Use and OSB Panels

2.4 UNDERLAYMENT

2.4.1 Hardboard

2.4.2 Plywood

2.4.3 Oriented Strand Board

2.5 OTHER MATERIALS

2.5.1 Hardboard Underlayment

2.5.2 Gypsum Wall Sheathing

2.5.3 Foil-Faced Insulative Sheathing

2.5.4 Building Paper

2.5.5 Trussed Rafters

2.5.6 Trussed Joists

2.5.7 Miscellaneous Wood Members

2.5.7.1 Nonstress Graded Members

2.5.7.2 Wood Bumpers

2.5.7.3 Sill Plates

2.5.7.4 Blocking

2.5.7.5 Rough Bucks and Frames

2.5.8 Adhesives

2.6 ROUGH HARDWARE

2.6.1 Bolts, Nuts, Studs, and Rivets

2.6.2 Anchor Bolts

2.6.3 Expansion Shields

2.6.4 Lag Screws and Lag Bolts

2.6.5 Wood Screws

2.6.6 Nails

2.6.7 Wire Nails

2.6.8 Timber Connectors

2.6.9 Clip Angles

2.6.10 Joist Hangers

2.6.11 Tie Straps

2.6.12 Joist Anchors

2.6.13 Door Buck Anchors

2.6.14 Metal Bridging

2.6.15 Toothed Rings and Shear Plates

2.6.16 Beam Anchors

2.6.17 Metal Framing Anchors

2.6.18 Panel Edge Clips

2.7 AIR INFILTRATION BARRIER

PART 3 EXECUTION

SECTION 06 10 00 Page 2

3.1 INSTALLATION

3.1.1 Sills

3.1.1.1 Anchors in Masonry

3.1.1.2 Anchors in Concrete

3.1.2 Beams and Girders

3.1.3 Roof Framing or Rafters

3.1.4 Joists

3.1.4.1 Floor (Ceiling) Framing

3.1.4.2 Doubled Joists

3.1.4.3 Tie Straps

3.1.4.4 Joist Anchors

3.1.5 Bridging

3.1.5.1 Wood Cross-Bridging

3.1.5.2 Metal Cross-Bridging

3.1.6 Subflooring

3.1.6.1 Plywood, Structural-Use, and OSB Panels

3.1.6.2 Combination Subfloor-Underlayment

3.1.6.3 Wood

3.1.6.4 Depressed Subfloors

3.1.7 Underlayment

3.1.8 Columns and Posts

3.1.9 Wall Framing

3.1.9.1 Studs

3.1.9.2 Plates

3.1.9.3 Firestops

3.1.9.4 Diagonal Bracing

3.1.10 Wall Sheathing

3.1.10.1 Plywood, Structural-Use, and OSB Panel Wall Sheathing

3.1.10.2 Fiberboard Wall Sheathing

3.1.10.3 Gypsum Sheathing Board

3.1.10.4 Foil-Faced Insulative Sheathing

3.1.10.5 Particleboard

3.1.10.6 Cellulose Honeycomb Panels

3.1.11 Wood Sheathing

3.1.12 Building Paper

3.1.13 Ceiling Joists

3.1.14 Metal Framing Anchors

3.1.15 Trusses

3.1.16 Structural Glued Laminated Timber Members

3.1.17 Plywood and Structural-Use Panel Roof Sheathing

3.1.18 Stair Framing

3.2 MISCELLANEOUS

3.2.1 Wood Roof Nailers, Edge Strips, Crickets, Curbs, and Cants

3.2.1.1 Roof Nailing Strips

3.2.1.2 Roof Edge Strips and Nailers

3.2.1.3 Crickets, Cants, and Curbs

3.2.2 Wood Blocking

3.2.3 Wood Grounds

3.2.4 Wood Furring

3.2.5 Wood Bumpers

3.2.6 Temporary Closures

3.2.7 Temporary Centering, Bracing, and Shoring

3.2.8 Wood Sleepers

3.2.9 Diaphragms

3.2.10 Shear Walls

3.2.11 Bridging

3.2.12 Corner Bracing

3.2.13 Sill Plates

SECTION 06 10 00 Page 3

3.3 INSTALLATION OF TIMBER CONNECTORS

3.4 ERECTION TOLERANCES

3.5 WASTE MANAGEMENT OF WOOD PRODUCTS

-- End of Section Table of Contents --

SECTION 06 10 00 Page 4

SECTION 06 10 00

ROUGH CARPENTRY

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN HARDBOARD ASSOCIATION (AHA)

AHA A135.4 (1995; R 2004) Basic Hardboard

AMERICAN INSTITUTE OF TIMBER CONSTRUCTION (AITC)

AITC 111 (2005) Recommended Practice for Protection of Structural Glued Laminated Timber During Transit, Storage and Erection

AITC TCM (2012) Timber Construction Manual, 5th Edition

ANSI/AITC A190.1 (2007) American National Standard, Structural Glued Laminated Timber

AMERICAN LUMBER STANDARDS COMMITTEE (ALSC)

ALSC PS 20 (2015) American Softwood Lumber Standard

AMERICAN RAILWAY ENGINEERING AND MAINTENANCE-OF-WAY ASSOCIATION

(AREMA)

AREMA Eng Man (2017) Manual for Railway Engineering

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

ASME B18.2.1 (2012; Errata 2013) Square and Hex Bolts and Screws (Inch Series)

ASME B18.2.2 (2022) Nuts for General Applications:

Machine Screw Nuts, and Hex, Square, Hex Flange, and Coupling Nuts (Inch Series)

ASME B18.5.2.1M (2006; R 2011) Metric Round Head Short Square Neck Bolts

ASME B18.5.2.2M (1982; R 2010) Metric Round Head Square Neck Bolts

ASME B18.6.1 (2016) Wood Screws (Inch Series)

SECTION 06 10 00 Page 5

AMERICAN WOOD COUNCIL (AWC)

AWC NDS (2015) National Design Specification (NDS) for Wood Construction

AWC WFCM (2012) Wood Frame Construction Manual for One- and Two-Family Dwellings

AMERICAN WOOD PROTECTION ASSOCIATION (AWPA)

AWPA M2 (2019) Standard for the Inspection of Preservative Treated Wood Products for Industrial Use

AWPA M6 (2013) Brands Used on Preservative Treated Materials

APA - THE ENGINEERED WOOD ASSOCIATION (APA)

APA E30 (2016) Engineered Wood Construction Guide

APA E445 (2002) Performance Standards and Qualification Policy for Structural-Use Panels (APA PRP-108)

APA EWS R540 (2013) Builder Tips: Proper Storage and Handling of Glulam Beams

APA EWS T300 (2007) Technical Note: Glulam Connection Details

APA F405 (19) Product Guide: Performance Rated Panels

APA L870 (2010) Voluntary Product Standard, PS 1-09, Structural Plywood

APA S350 (2014) PS 2-10, Performance Standard for Wood-Based Structural-Use Panels

ASTM INTERNATIONAL (ASTM)

ASTM A153/A153M (2016a) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware

ASTM A307 (2021) Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength

ASTM A653/A653M (2020) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM C1136 (2021) Standard Specification for Flexible, Low Permeance Vapor Retarders for Thermal Insulation

SECTION 06 10 00 Page 6

ASTM C1396/C1396M (2017) Standard Specification for Gypsum Board

ASTM D198 (2015) Standard Test Methods of Static Tests of Lumber in Structural Sizes

ASTM D696 (2016) Standard Test Method for Coefficient of Linear Thermal Expansion of Plastics Between -30 degrees C and 30 degrees C With a Vitreous Silica Dilatometer

ASTM D1435 (2013) Standard Practice for Outdoor Weathering of Plastics

ASTM D2344/D2344M (2016) Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates

ASTM D2898 (2010; R 2017) Standard Practice for Accelerated Weathering of Fire-Retardant-Treated Wood for Fire Testing

ASTM D3498 (2019a) Standard Specification for Adhesives for Field-Gluing Wood Structural Panels (Plywood or Oriented Stand Board) to Wood Based Floor System Framing

ASTM D6108 (2013) Standard Test Method for Compressive Properties of Plastic Lumber and Shapes

ASTM D6109 (2013) Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastic Lumber and Related Products

ASTM D6111 (2013a) Standard Test Method for Bulk Density and Specific Gravity of Plastic Lumber and Shapes by Displacement

ASTM D6112 (2013) Compressive and Flexural Creep and Creep-Rupture of Plastic Lumber and Shapes

ASTM D6117 (2016) Standard Test Methods for Mechanical Fasteners in Plastic Lumber and Shapes

ASTM E96/E96M (2022) Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials

ASTM F547 (2017) Standard Terminology of Nails for Use with Wood and Wood-Base Materials

ASTM F1667/F1667M (2021a) Standard Specification for Driven Fasteners: Nails, Spikes, and Staples

SECTION 06 10 00 Page 7

CALIFORNIA AIR RESOURCES BOARD (CARB)

CARB 93120 (2007) Airborne Toxic Control Measure (ATCM) to Reduce Formaldehyde Emissions from Composite Wood Products

CALIFORNIA DEPARTMENT OF PUBLIC HEALTH (CDPH)

CDPH SECTION 01350 (2010; Version 1.1) Standard Method for the Testing and Evaluation of Volatile Organic Chemical Emissions from Indoor Sources using Environmental Chambers

FM GLOBAL (FM)

FM 4435 (2013) Roof Perimeter Flashing

GREEN SEAL (GS)

GS-36 (2013) Adhesives for Commercial Use

INTERNATIONAL CODE COUNCIL (ICC)

ICC IBC (2021) International Building Code

NATIONAL HARDWOOD LUMBER ASSOCIATION (NHLA)

NHLA Rules (2015) Rules for the Measurement & Inspection of Hardwood & Cypress

NORTHEASTERN LUMBER MANUFACTURERS ASSOCIATION (NELMA)

NELMA Grading Rules (2013) Standard Grading Rules for Northeastern Lumber

REDWOOD INSPECTION SERVICE (RIS) OF THE CALIFORNIA REDWOOD

ASSOCIATION (CRA)

RIS Grade Use (1998) Redwood Lumber Grades and Uses

SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT (SCAQMD)

SCAQMD Rule 1168 (2017) Adhesive and Sealant Applications

SOUTHERN CYPRESS MANUFACTURERS ASSOCIATION (SCMA)

SCMA Spec (1986; Supple. No. 1, Aug 1993) Standard Specifications for Grades of Southern Cypress

SOUTHERN PINE INSPECTION BUREAU (SPIB)

SPIB 1003 (2014) Standard Grading Rules for Southern Pine Lumber

TRUSS PLATE INSTITUTE (TPI)

TPI 1 (2014) National Design Standard for Metal Plate Connected Wood Truss Construction, SECTION 06 10 00 Page 8

Including Commentary and Appendices

TPI HIB (1991) Commentary and Recommendations for Handling, Installing and Bracing Metal Plate Connected Wood Trusses

U.S. DEPARTMENT OF COMMERCE (DOC)

DOC/NIST PS58 (1973) Basic Hardboard (ANSI A135.4)

U.S. GENERAL SERVICES ADMINISTRATION (GSA)

CID A-A-1923 (Rev A; Notice 3) Shield, Expansion (Lag, Machine and Externally Threaded Wedge Bolt Anchors)

CID A-A-1924 (Rev A; Notice 3) Shield, Expansion (Self Drilling Tubular Expansion Shell Bolt Anchors

CID A-A-1925 (Rev A; Notice 3) Shield Expansion (Nail Anchors)

FS UU-B-790 (Rev A; Notice 2) Building Paper Vegetable Fiber: (Kraft, Waterproofed, Water Repellent and Fire Resistant)

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

40 CFR 770 Formaldehyde Standards for Composite Wood Products

UNDERWRITERS LABORATORIES (UL)

UL 2818 (2013) GREENGUARD Certification Program For Chemical Emissions For Building Materials, Finishes And Furnishings

WEST COAST LUMBER INSPECTION BUREAU (WCLIB)

WCLIB 17 (2015) Standard Grading Rules

WESTERN WOOD PRODUCTS ASSOCIATION (WWPA)

WWPA G-5 (2017) Western Lumber Grading Rules

1.2 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are for Contractor Quality Control approval. When used, a code following the "G" classification identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Structural Glued Laminated Members; G

SECTION 06 10 00 Page 9

Trussed Rafters; G

Trussed Joists; G

Fabricated Structural Members; G

Modifications of Structural Members; G

Drawings of structural laminated members, fabricated wood trusses, engineered wood joists and rafters, and other fabricated structural members indicating materials, shop fabrication, and field erection details; including methods of fastening.

Nailers and Nailing Strips; G

Drawings of field erection details, including materials and methods of fastening nailers in conformance with Factory Mutual wind uplift rated systems specified in other Sections of these specifications.

SD-03 Product Data

Underlayment

Plastic Lumber

Fire-retardant Treatment

Structural-use and OSB Panels

Oriented Strand Board

Adhesives

Recycled Content for Plastic Lumber; S

SD-05 Design Data

Modifications of Structural Members; G

Design analysis and calculations showing design criteria used to accomplish the applicable analysis.

SD-06 Test Reports

Preservative-treated Lumber and Plywood

SD-07 Certificates

Certificates of Grade

Certified Sustainably Harvested Virgin Lumber; S

Certified Sustainably Harvested Natural-decay and Insect-resistant Wood; S

Certified Sustainably Harvested Framing Lumber; S

Certified Sustainably Harvested Structural Glued Laminated Timber;

SECTION 06 10 00 Page 10

S

Certified Sustainably Harvested Plywood Subflooring; S

Certified Sustainably Harvested Structural-use and OSB Panel Subfloor Sheathing; S

Certified Sustainably Harvested Plywood Combination Subfloor Underlayment; S

Certified Sustainably Harvested Plywood Wall Sheathing; S

Certified Sustainably Harvested Structural-use and OSB Panel Wall Sheathing; S

Certified Sustainably Harvested Plywood Roof Sheathing; S

Certified Sustainably Harvested Plywood Diaphragm; S

Certified Sustainably Harvested Structural-use and OSB Panel Diaphragm; S

Certified Sustainably Harvested Plywood Shear Wall; S

Certified Sustainably Harvested Structural-use and OSB Panel Shear Wall; S

Certified Sustainably Harvested Plywood Underlayment; S

Preservative Treatment

Indoor Air Quality for Aerosol Adhesives; S

Indoor Air Quality for Non-aerosol Adhesives; S

SD-10 Operation and Maintenance Data

1.3 DELIVERY AND STORAGE

Deliver materials to the site in an undamaged condition. Store, protect, handle, and install prefabricated structural elements in accordance with manufacturer's instructions and as specified. Store materials off the ground to provide proper ventilation, with drainage to avoid standing water, and protection against ground moisture and dampness. Store materials with a moisture barrier at both the ground level and as a cover forming a well ventilated enclosure. Store wood I-beams and glue-laminated beams and joists on edge. Adhere to requirements for stacking, lifting, bracing, cutting, notching, and special fastening requirements. Handle and store laminated timber in accordance with AITC 111 or APA EWS R540. Do not use materials that have visible moisture or biological growth. Remove defective and damaged materials and provide new materials. Store separated reusable wood waste convenient to cutting station and area of work.

SECTION 06 10 00 Page 11

1.4 GRADING AND MARKING

1.4.1 Lumber

Mark each piece of framing and board lumber or each bundle of small pieces of lumber with the grade mark of a recognized association or independent inspection agency. Such association or agency must be certified by the Board of Review, American Lumber Standards Committee, to grade the species used. Surfaces that are to be exposed to view must not bear grademarks, stamps, or any type of identifying mark. Hammer marking will be permitted on timbers when all surfaces will be exposed to view.

1.4.2 Structural Glued Laminated Timber

Mark each member with the mark of a recognized association or independent inspection agency that maintains continuing control over the quality of structural glued laminated timber products. The marking must indicate compliance with ANSI/AITC A190.1 and must include all identification information required by ANSI/AITC A190.1 . Structurally end-jointed lumber must also be certified and grade marked in accordance with ANSI/AITC A190.1 .

1.4.3 Plywood

Mark each sheet with the mark of a recognized association or independent inspection agency that maintains continuing control over the quality of the plywood. The mark must identify the plywood by species group or span rating, exposure durability classification, grade, and compliance with APA L870 . Surfaces that are to be exposed to view must not bear grademarks or other types of identifying marks.

1.4.4 Structural-Use and OSB Panels

Mark each panel with the mark of a recognized association or independent inspection agency that maintains continuing control over the quality of the panel. The mark must indicate end use, span rating, and exposure durability classification. Oriented Strand Board (OSB), APA F405 .

1.4.5 Preservative-Treated Lumber and Plywood

The Contractor is responsible for the quality of treated wood products.

Each treated piece must be inspected in accordance with AWPA M2 and permanently marked or branded, by the producer, in accordance with AWPA M6.

The Contractor must provide Contracting Officer's Representative (COR) with the inspection report of an approved independent inspection agency that offered products comply with applicable AWPA Standards. The appropriate Quality Mark on each piece will be accepted, in lieu of inspection reports, as evidence of compliance with applicable AWPA treatment standards.

1.4.6 Fire-Retardant Treated Lumber

Mark each piece in accordance with AWPA M6, except pieces that are to be natural or transparent finished. In addition, exterior fire-retardant lumber must be distinguished by a permanent penetrating blue stain.

Labels of a nationally recognized independent testing agency will be accepted as evidence of conformance to the fire-retardant requirements of

AWPA M6.

SECTION 06 10 00 Page 12

1.4.7 Hardboard, Gypsum Board, and Fiberboard

Mark each sheet or bundle to identify the standard under which the material is produced and the producer.

1.5 SIZES AND SURFACING

ALSC PS 20 for dressed sizes of yard and structural lumber. Lumber must be surfaced four sides. Size references, unless otherwise specified, are nominal sizes, and actual sizes must be within manufacturing tolerances allowed by the standard under which the product is produced. Other measurements are IP or SI standard.

1.6 MOISTURE CONTENT

Air-dry or kiln-dry lumber. Kiln-dry treated lumber after treatment.

Maximum moisture content of wood products must be as follows at the time of delivery to the job site:

a. Framing lumber and board, 19 percent maximum

b. Timbers 5 inches and thicker, 25 percent maximum

c. Roof planking, 15 percent maximum

d. Materials other than lumber; moisture content must be in accordance with standard under which the product is produced

1.7 PRESERVATIVE TREATMENT

a. 0.25 pcf intended for above ground use.

b. 0.40 pcf intended for ground contact and fresh water use. 0.60 pcf intended for Ammoniacal Copper Quaternary Compound (ACQ)-treated foundations. 0.80 to 1.00 pcf intended for ACQ-treated pilings. All wood must be air or kiln dried after treatment. Specific treatments must be verified by the report of an approved independent inspection agency, or the AWPA Quality Mark on each piece. Brush coat areas that are cut or drilled after treatment with either the same preservative used in the treatment or with a 2 percent copper naphthenate solution.

Plastic lumber must not be preservative treated. The following items must be preservative treated:

(1) Wood framing, woodwork, and plywood up to and including the subflooring at the first-floor level of structures having crawl spaces when the bottoms of such items are 24 inches or less from the earth underneath.

(2) Wood members that are in contact with water.

(3) Exterior wood steps, platforms, and railings; and all wood framing of open, roofed structures.

(4) Wood sills, soles, plates, furring, and sleepers that are less than 24 inches from the ground, furring and nailers that are set into or in contact with concrete or masonry.

(5) Nailers, edge strips, crickets, curbs, and cants for roof decks.

SECTION 06 10 00 Page 13

1.8 FIRE-RETARDANT TREATMENT

Fire-retardant treated wood must be pressure treated Treatment and performance inspection must be by an independent and qualified testing agency that establishes performance ratings. Each piece or bundle of treated material must bear identification of the testing agency to indicate performance in accordance with such rating. Treated materials to be exposed to rain wetting must be subjected to an accelerated weathering technique in accordance with ASTM D2898 prior to being tested. Such items which will not be inside a building, and such items which will be exposed to heat or high humidity, must receive exterior fire-retardant treatment.

Fire-retardant-treated wood products must be free of halogens, sulfates, ammonium phosphate, and formaldehyde. Items to be treated will be indicated on the drawings.

1.9 QUALITY ASSURANCE

1.9.1 Drawing Requirements

For fabricated structural members, trusses, qlu-lam members, indicate materials, details of construction, methods of fastening, and erection details. Include reference to design criteria used and manufacturers design calculations. Submit drawings for all proposed modifications of structural members. Do not proceed with modifications until the submittal has been approved.

1.9.2 Data Required

Submit calculations and drawings for all proposed modifications of structural members. Do not proceed with modifications until the submittal has been approved.

1.9.3 Plastic Lumber Performance

Plastic lumber intended for use in exterior applications must have no fading or discoloration and no change in dimensional stability as tested in accordance with ASTM D1435 for a period of 5 years.

1.10 CERTIFICATIONS

1.10.1 Certified Wood Grades

Provide certificates of grade from the grading agency on graded but unmarked lumber or plywood attesting that materials meet the grade requirements specified herein.

1.10.2 Indoor Air Quality Certifications

Submit required indoor air quality certifications in one submittal package.

1.10.2.1 Adhesives and Sealants

Provide products certified to meet indoor air quality requirements by UL 2818 (Greenguard) Gold, SCS Global Services Indoor Advantage Gold or provide certification or validation by other third-party programs that products meet the requirements of this Section. Provide current product certification documentation from certification body. When product does not have certification, provide validation that product meets the indoor air quality product requirements cited herein.

SECTION 06 10 00 Page 14

1.10.2.2 Composite Wood, Wood Structural Panel and Agrifiber Products

For purposes of this specification, composite wood and agrifiber products include particleboard, medium density fiberboard (MDF), strawboard, panel substrates, and door cores. Provide products certified to meet requirements of both 40 CFR 770 and CARB 93120 . Provide current product certification documentation from certification body.

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 Virgin Lumber

Lumber fabricated from old growth timber is not permitted. Avoid companies who buy, sell, or use old growth timber in their operations, when possible. Provide certified sustainably harvested virgin lumber.

2.1.2 Natural Decay- and Insect-Resistant Wood

Naturally durable wood must be certified sustainably harvested natural-decay and insect-resistant wood. An occasional piece with corner sapwood is permitted if 90 percent or more of the width of each side on which the sapwood occurs is heartwood.

2.1.3 Plastic Lumber

HDPE lumber must contain a minimum of 90 percent total recycled content.

Mixed plastics and cellulose lumber must contain a minimum of 100 percent total recovered materials content, with a minimum of 50 percent post-consumer recycled content. HDPE/fiberglass lumber must contain a minimum of 95 percent total recovered materials content with a minimum of 75 percent post-consumer recycled content. Other mixed resin lumber must contain a minimum of 95 percent total recovered materials content with a minimum of 50 percent post-consumer recycled content. Provide data identifying percentage of recycled content for plastic lumber.

2.1.3.1 Shear Parallel to Length

Maximum 1,000 psi in accordance with ASTM D2344/D2344M .

2.1.3.2 Density

ASTM D6111.

2.1.3.3 Compressive Strength

a. Secant Modulus: Minimum 70,000 psi in accordance with ASTM D6108.

b. Stress at 3 percent strain: Minimum 1,500 psi in accordance with

ASTM D6108.

c. Compression Parallel to Grain: Minimum 3,000 psi in accordance with

ASTM D6112.

d. Compression Perpendicular to Grain: Minimum 1,000 psi in accordance with ASTM D6112.

SECTION 06 10 00 Page 15

2.1.3.4 Flexural Strength

Minimum 2,000 psi in accordance with ASTM D6109.

2.1.3.5 Tensile Strength

Minimum 1,250 psi in accordance with ASTM D198.

2.1.3.6 Coefficient of Thermal Expansion

Maximum 0.000080 in/in/degree F in accordance with ASTM D696.

2.1.3.7 Screw Withdrawal

350 lbs in accordance with ASTM D6117.

2.1.3.8 Nail Withdrawal

150 lbs in accordance with ASTM D6117.

2.2 LUMBER

2.2.1 Structural Lumber

Use grades and species of lumber as indicated on the drawings.

2.2.2 Framing Lumber

Framing lumber such as studs, plates, caps, collar beams, cant strips, bucks, sleepers, nailing strips, and nailers and board lumber such as subflooring and wall and roof sheathing must be one of the species listed in the table below. Minimum grade of species must be as listed. Provide certified sustainably harvested framing lumber.

SECTION 06 10 00 Page 16

Table of Grades for Framing and Board Lumber

Grading Rules Species Framing Board Lumber

WWPA G-5 standard grading rules

Aspen, Douglas Fir-Larch, Douglas Fir South, Engelmann Spruce-Lodgepole Pine, Engelmann Spruce, Hem-Fir, Idaho White Pine, Lodgepole Pine, Mountain Hemlock, Mountain Hemlock-Hem-Fir, Ponderosa Pine-Sugar Pine, Ponderosa Pine-Lodgepole Pine, Subalpine Fir, White Woods, Western Woods, Western Cedars, Western Hemlock

All Species:

Standard Light Framing or No. 3 Structural Light Framing (Stud Grade for 2x4 nominal size, 10 feet and shorter)

All Species:

No. 3 Common

WCLIB 17 standard grading rules

Douglas Fir-Larch, Hem-Fir, Mountain Hemlock, Sitka Spruce, Western Cedars, Western Hemlock

All Species:

Standard Light Framing or No. 3 Structural Light Framing (Stud Grade for 2x4 nominal size, 10 feet and shorter)

All Species:

Standard

SECTION 06 10 00 Page 17

Grading Rules Species Framing Board Lumber

SPIB 1003 standard grading rules

Southern Pine All Species:

Standard Light Framing or No. 3 Structural Light Framing (Stud Grade for 2x4 nominal size, 10 feet and shorter)

No. 2 Boards

SCMA Spec standard specifications

Cypress No. 2 Common No. 2 Common

NELMA Grading Rules standard grading rules

Balsam Fir, Eastern Hemlock-Tamarack, Eastern Spruce, Eastern White Pine, Northern Pine, Northern Pine-Cedar

All Species:

Standard Light Framing or No. 3 Structural Light Framing (Stud Grade for 2x4 nominal size, 10 feet and shorter)

All Species:

No. 3 Common except Standard for Eastern White and Northern Pine

RIS Grade Use standard specifications

Redwood All Species:

Standard Light Framing or No. 3 Structural Light Framing (Stud Grade for 2x4 nominal size, 10 feet and shorter)

Construction Heart

SECTION 06 10 00 Page 18

Grading Rules Species Framing Board Lumber

NHLA Rules rules for the measurement and inspection of hardwood and cypress lumber

Cypress No. 2 Dimension No. 2 Common

2.2.3 Structural Glued Laminated Timber

ANSI/AITC A190.1 , allowable working stress values for loads of normal duration in pounds per square inch (psi) shall be per the grade indicated on the drawings.

Fabricated with wet-use adhesives. Beams must use glue-laminated lumber.

Posts and studs must use laminated-strand lumber. Joists must use laminated-veneer lumber. Members must be Architectural Appearance Grade, sealed with a penetrating sealer, and bundle wrapped as standard with the manufacturer and approved. Members must be complete with hardware for joining laminated members and for their connection to other construction.

Provide certified sustainably harvested structural glued laminated timber.

When located on the interior of buildings, provide products with no added urea-formaldehyde resins.

2.3 PLYWOOD, STRUCTURAL-USE, AND ORIENTED STRAND BOARD (OSB) PANELS

APA L870 , APA S350 , APA E445 , and APA F405 respectively.

2.3.1 Subflooring

2.3.1.1 Plywood

C-D Grade, Exposure 1 durability classification, Span rating of 48/24 or greater. Provide certified sustainably harvested plywood subflooring.

2.3.1.2 Structural-Use and OSB Panels

Sheathing grade with durability equivalent to Exposure 1, Span Rating of 48/24 or greater. OSB, APA E445 , Rated Sturd-I-Floor. Provide certified sustainably harvested structural-use and OSB panel subfloor sheathing.

2.3.2 Combination Subfloor-Underlayment

2.3.2.1 Plywood

Exterior Type, C-C (Plugged) Grade. Provide certified sustainably harvested plywood combination subfloor underlayment. Minimum thickness must be as listed below except where indicated to have greater thickness.

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Support Spacing Underlayment Minimum Thickness

16 inches 1/2 inch for Group 1 species

19/32 inch for Group 2 and 3 species

23/32 inch for Group 4 species

24 inches 23/32 inch for Group 1 species

7/8 inch for Group 2 and 3 species

1 inch for Group 4 species

2.3.2.2 Structural-Use Panel

Combination subfloor-underlayment grade with durability equivalent to Interior plywood with Exterior glue (Exposure 1), Span Rating of 48 or greater.

2.3.3 Wall Sheathing

2.3.3.1 Plywood

C-D Grade, Exposure 1, and a minimum thickness of 1/2 inch , except where indicated to have greater thickness. Provide certified sustainably harvested plywood wall sheathing.

2.3.3.2 Structural-Use and OSB Panels

Sheathing grade with durability equivalent to Exposure 1, Span Rating of 24/0 or greater. OSB, APA Rated Sheathing. OSB must be a phenolic-glued board. Provide certified sustainably harvested structural-use and OSB panel wall sheathing.

2.3.4 Roof Sheathing

2.3.4.1 Plywood

C-D Grade, Exposure 1, with an Identification Index of not less than 24/0.

Provide certified sustainably harvested plywood roof sheathing. Provide exterior grade material with phenol resin for all applications.

2.3.4.2 Structural-Use Panel

Sheathing grade with durability equivalent to Exposure 1, Span Rating of 24/0 or greater.

2.3.5 Diaphragms

2.3.5.1 Plywood

Structural I, C-D grade, Exposure 1, and a minimum thickness of 1/2 inch.

Provide certified sustainably harvested plywood diaphragm.

SECTION 06 10 00 Page 20

2.3.5.2 Structural-Use and OSB Panels

Sheathing grade with durability equivalent to Exposure 1 and a minimum thickness of 1/2 inch. Provide certified sustainably harvested structural-use and OSB panel diaphragm.

2.3.6 Shear Walls

2.3.6.1 Plywood

Structural I, C-D Grade and a minimum thickness of 1/2 inch. Provide certified sustainably harvested plywood shear wall.

2.3.6.2 Structural-Use and OSB Panels

Sheathing grade with durability equivalent to Interior plywood with Exterior glue (Exposure 1) and a minimum thickness of 1/2 inch. Provide certified sustainably harvested structural-use and OSB panel shear wall.

2.4 UNDERLAYMENT

Underlayment must conform to one of the following:

2.4.1 Hardboard

AHA A135.4 service class, sanded one side, 1/4 inch thick, 4 feet wide.

2.4.2 Plywood

Plywood must conform to APA L870 , underlayment grade with exterior glue, or C-C (Plugged) exterior grade 11/32 inch thick, 4 feet wide. Provide certified sustainably harvested plywood underlayment.

2.4.3 Oriented Strand Board

OSB underlayment grade 0.225 inch.

2.5 OTHER MATERIALS

2.5.1 Hardboard Underlayment

DOC/NIST PS58 , service class, sanded on one side, 1/4 inch thick 4 feet wide.

2.5.2 Gypsum Wall Sheathing

ASTM C1396/C1396M , 1/2 inch thick ; 4 feet wide with square edge for supports 16 inches o.c. with or without corner bracing of framing or for supports 24 inches o.c. with corner bracing of framing; 2 feet wide with V-tongue and groove (T&G) edge for supports 16 or 24 inches o.c. with corner bracing of framing, unless greater thickness or fire retardant (Type X) is indicated on the drawings.

2.5.3 Foil-Faced Insulative Sheathing

Wood fiber core, chemically treated for water resistance, with aluminum foil laminated under pressure to both sides with water-resistant adhesive;

48 inches or 48 3/4 inches wide; 0.078 inch thick when used with corner

SECTION 06 10 00 Page 21 bracing, 0.115 inch thick with studs up to 16 inches o.c. without corner bracing, or 0.137 inch thick with studs up to 24 inches o.c. without corner bracing. The sheathing and installation must have been accepted by ICC as conforming to ICC IBC . The sheathing alone must have a thermal resistance value (R value) of not less than 0.20.

2.5.4 Building Paper

FS UU-B-790 , Type I, Grade D, Style 1.

2.5.5 Trussed Rafters

Metal plate connected trusses designed in accordance with TPI 1 and TPI HIB and fabricated in accordance with TPI 1 .

2.5.6 Trussed Joists

Metal plate connected parallel chord wood trusses designed and fabricated in accordance with TPI 1 .

2.5.7 Miscellaneous Wood Members

2.5.7.1 Nonstress Graded Members

Members must include bridging, corner bracing, furring, grounds, and nailing strips. Members must be in accordance with TABLE I for the species used. Sizes must be as follows unless otherwise shown:

Member Size inch

Bridging 1 x 3 or 1 x 4 for use between members 2 x 12 and smaller; 2 x 4 for use between members larger than 2 x 12.

Corner bracing 1 x 4.

Furring 1 x 2

Grounds Plaster thickness by 38.

Nailing strips 1 x 3 or 1 x 4 when used as shingle base or interior finish, otherwise 2 inch stock.

2.5.7.2 Wood Bumpers

AREMA Eng Man, Industrial grade cross ties

2.5.7.3 Sill Plates

Sill plates must be standard or number 2 grade.

2.5.7.4 Blocking

Blocking must be standard or number 2 grade.

SECTION 06 10 00 Page 22

2.5.7.5 Rough Bucks and Frames

Rough bucks and frames must be straight standard or number 2 grade.

2.5.8 Adhesives

Comply with applicable regulations regarding toxic and hazardous materials and as specified. Provide non-aerosol adhesive products used on the interior of the building (defined as inside of the weatherproofing system) meeting either emissions requirements of CDPH SECTION 01350 (limit requirements for either office or classroom spaces regardless of space type) or VOC content requirements of SCAQMD Rule 1168 . Provide aerosol adhesives used on the interior of the building meeting either emissions requirements of CDPH SECTION 01350 (limit requirements for either office or classroom spaces regardless of space type) or VOC content requirements of GS-36. Provide certification or validation of indoor air quality for non-aerosol adhesives applied on the interior of the building (inside of the weatherproofing system). Provide certification or validation of indoor air quality for aerosol adhesives used on the interior of the building (inside of the weatherproofing system).

2.6 ROUGH HARDWARE

Unless otherwise indicated or specified, rough hardware must be of the type and size necessary for the project requirements. Sizes, types, and spacing of fastenings of manufactured building materials must be as recommended by the product manufacturer unless otherwise indicated or specified. Rough hardware exposed to the weather or embedded in or in contact with preservative treated wood, exterior masonry, or concrete walls or slabs must be hot-dip zinc-coated in accordance with ASTM A153/A153M . Nails and fastenings for fire-retardant treated lumber and woodwork exposed to the weather must be copper alloy or hot-dipped galvanized fasteners as recommended by the treated wood manufacturer.

2.6.1 Bolts, Nuts, Studs, and Rivets

ASME B18.2.1 , ASME B18.5.2.1M , ASME B18.5.2.2M and ASME B18.2.2 .

2.6.2 Anchor Bolts

ASTM A307, size as indicated, complete with nuts and washers.

2.6.3 Expansion Shields

CID A-A-1923 , CID A-A-1924 , and CID A-A-1925 . Except as shown otherwise, maximum size of devices must be 3/8 inch.

2.6.4 Lag Screws and Lag Bolts

ASME B18.2.1 .

2.6.5 Wood Screws

ASME B18.6.1 .

2.6.6 Nails

ASTM F547, size and type best suited for purpose. For sheathing and subflooring, length of nails must be sufficient to extend 1 inch into

SECTION 06 10 00 Page 23 supports. In general, 8-penny or larger nails must be used for nailing through 1 inch thick lumber and for toe nailing 2 inch thick lumber;

16-penny or larger nails must be used for nailing through 2 inch thick lumber. Nails used with treated lumber and sheathing must be hot-dipped galvanized in accordance with ASTM A153/A153M . Nailing must be in accordance with the recommended nailing schedule contained in AWC WFCM.

Where detailed nailing requirements are not specified, nail size and spacing must be sufficient to develop an adequate strength for the connection. The connection's strength must be verified against the nail capacity tables in AWC NDS. Reasonable judgment backed by experience must ensure that the designed connection will not cause the wood to split. If a load situation exceeds a reasonable limit for nails, a specialized connector must be used.

2.6.7 Wire Nails

ASTM F1667/F1667M .

2.6.8 Timber Connectors

Unless otherwise specified, timber connectors must be in accordance with TPI 1 , APA EWS T300 or AITC TCM.

2.6.9 Clip Angles

Steel, 3/16 inch thick, size best suited for intended use; or zinc-coated steel or iron commercial clips designed for connecting wood members.

2.6.10 Joist Hangers

Steel or iron, zinc coated, sized to fit the supported member, of sufficient strength to develop the full strength of the supported member in accordance with ICC IBC , and furnished complete with any special nails required.

2.6.11 Tie Straps

For joists supported by the lower flange of steel beams, provide 1/8 by 1-1/2 inch steel strap, 2 feet long, except as indicated otherwise.

2.6.12 Joist Anchors

For joists supported by masonry walls, provide anchors 3/16 by 1 1/2 inch steel tee or strap, bent and of length to provide 4 inches embedment into wall and 12 inches along joist except as indicated otherwise. For joists parallel to masonry or concrete walls, provide anchors 1/4 by 1-1/4 inch minimum cross-sectional area, steel strap, length as necessary to extend over top of first three joists and into wall 8 inches, and with wall end of bend or pin type, except as indicated otherwise.

2.6.13 Door Buck Anchors

Metal anchors, 1/8 by 1-1/4 inch steel, 12 inches long, with ends bent 2 inches, except as indicated otherwise. Anchors must be screwed to the backs of bucks and built into masonry or concrete. Locate 8 inches above sills and below heads and not more than 24 inches intermediately between.

Anchorage of bucks to steel framing must be as necessary to suit the conditions.

SECTION 06 10 00 Page 24

2.6.14 Metal Bridging

Where not indicated or specified otherwise, No. 16 U.S. Standard gage, cadmium-plated or zinc-coated.

2.6.15 Toothed Rings and Shear Plates

AWC NDS.

2.6.16 Beam Anchors

Steel U-shaped strap anchors 1/4 inch thick by 1-1/2 inches wide, except as indicated otherwise.

2.6.17 Metal Framing Anchors

Construct anchors to the configuration shown using hot dip zinc-coated steel conforming to ASTM A653/A653M , G90. Except where otherwise shown, Steel must be not lighter than 18 gage. Special nails supplied by the manufacturer must be used for all nailing.

2.6.18 Panel Edge Clips

Extruded aluminum or galvanized steel, H-shaped clips to prevent differential deflection of roof sheathing.

2.7 AIR INFILTRATION BARRIER

Air infiltration barrier must be building paper meeting the requirements of ASTM C1136, Type IV, style optional or a tear and puncture resistant olefin building wrap (polyethylene or polypropylene) with a moisture vapor transmission rate of 125 g per square meter per 24 hours in accordance with ASTM E96/E96M, Desiccant Method at 23 degrees C or with a moisture vapor transmission rate of 670 g per square meter per 24 hours in accordance with ASTM E96/E96M, Water Method at 23 degrees C.

PART 3 EXECUTION

3.1 INSTALLATION

Do not install building construction materials that show visual evidence of biological growth.

Conform to AWC WFCM unless otherwise indicated or specified. Select lumber sizes to minimize waste. Fit framing lumber and other rough carpentry, set accurately to the required lines and levels, and secure in place in a rigid manner. Do not splice framing members between bearing points. Set joists, rafters, and purlins with their crown edge up. Frame members for the passage of pipes, conduits, and ducts. Do not cut or bore structural members for the passage of ducts or pipes without approval.

Reinforce all members damaged by such cutting or boring by means of specially formed and approved sheet metal or bar steel shapes, or remove and provide new, as approved. Provide as necessary for the proper completion of the work all framing members not indicated or specified.

Spiking and nailing not indicated or specified otherwise must be in accordance with the Nailing Schedule contained in ICC IBC ; perform bolting in an approved manner. Spikes, nails, and bolts must be drawn up tight.

Timber connections and fastenings must conform to AWC NDS. Use slate or steel shims when leveling joists, beams, and girders on masonry or

SECTION 06 10 00 Page 25 concrete. Do not use shimming on wood or metal bearings. When joists, beams, and girders are placed on masonry or concrete, a wood base plate must be positioned and leveled with grout. The joist, beam, or girder must then be placed on the plate. When joists, beams, and girders are set into masonry or concrete, a pocket must be formed into the wall. The joist, beam, or girder must then be placed into the pocket and leveled with a steel shim.

3.1.1 Sills

Set sills level and square and wedge with steel or slate shims; point or grout with non-shrinking cement mortar to provide continuous and solid bearing. Anchor sills to the foundations as indicated. Where sizes and spacing of anchor bolts are not indicated, provide not less than 5/8 inch diameter bolts at all corners and splices and space at a maximum of 6 feet o.c. between corner bolts. Provide at least two bolts for each sill member. Lap and splice sills at corners and bolt through the laps or butt the ends and through-bolt not more than 6 inches from the ends. Provide bolts with plate washers and nuts. Bolts in exterior walls must be zinc-coated.

3.1.1.1 Anchors in Masonry

Except where indicated otherwise, Embed anchor bolts not less than 15 inches in masonry unit walls and provide each with a nut and a 2 inch diameter washer at bottom end. Fully grout bolts with mortar.

3.1.1.2 Anchors in Concrete

Except where indicated otherwise, Embed anchor bolts not less than 8 inches in poured concrete walls and provide each with a nut and a 2 inch diameter washer at bottom end. A bent end may be substituted for the nut and washer; bend must be not less than 90 degrees. Powder-actuated fasteners spaced 3 feet o.c. may be provided in lieu of bolts for single thickness plates on concrete.

3.1.2 Beams and Girders

Set beams and girders level and in alignment and anchor to bearing walls, piers, or supports with U-shaped steel strap anchors. Embed anchors in concrete or masonry at each bearing and through-bolt to the beams or girders with not less than two bolts. Provide bolts not less than 1/2 inch in diameter and with plate washers under heads and nuts. Install beams and girders not indicated otherwise with 8 inch minimum end bearing on walls or supports. Install beams and girders into walls with 1/2 inch clearance at the top, end, and sides or standard steel wall-bearing boxes.

Provide joints and splices over bearings only and bolt or spike together.

3.1.3 Roof Framing or Rafters

Tops of supports or rafters must form a true plane. Valley, ridge, and hip members must be of depth equal to cut on rafters where practicable, but in no case less than depth of rafters and nominally 2 inches thick.

Rafters must have full and solid bearing on plates. Valleys, hips, and ridges must be straight and true intersections of roof planes. Necessary crickets and watersheds must be formed. Rafters, except hip and valley rafters, must be spiked to wall plate and to ceiling joists with no less than three 8-penny nails or bolted by angles. Rafters must be toe-nailed to ridge, valley, or hip members with at least three 8-penny nails.

SECTION 06 10 00 Page 26

Rafters must be braced to prevent movement until permanent bracing, decking or sheathing is installed. Hip and valley rafters must be secured to wall plates by clip angles. Openings in roof must be framed with headers and trimmers. Unless otherwise indicated, headers carrying more than two rafters and trimmers supporting headers carrying more than one rafter must be double. Hip rafters longer than the available lumber must be butt jointed and scabbed. Valley rafters longer than the available lumber must be double, with pieces lapped not less than 4 feet and well spiked together. Install trussed rafters in accordance with TPI HIB .

Install engineered wood joists in accordance with distributor's instructions.

3.1.4 Joists

Provide joists of the sizes and spacing indicated, accurately and in alignment, and of uniform width. Joists must have full bearing on sills, plates, beams, girders, and trusses; provide laps over bearing only and spike. Where joists are of insufficient length to produce a 12 inch lap, butt joists over bearing and provide wood scabs 2 nominal inches thick by depth of joists by 24 inches long or metal straps 1/4 by 1 1/2 inch by not less than 18 inches long nailed to each joist with not less than four 10-penny nails, or approved sheet metal connectors installed in accordance with the manufacturer's recommendations. Provide joists built into masonry with standard steel wall bearing boxes. Provide metal hangers for joists framing into the side of headers, beams, or girders. When a portion of the joist extends above the top flange of a steel beam or girder, provide a 3/8 inch space between the top flange and the extended portion of the joists to allow for shrinkage of joists. The minimum joist end bearing must be 4 inches, and joists built into concrete or masonry must have a 1/2 inch minimum clearance at the top, end, and sides. For joists approved to be bored for the passage of pipes or conduits, bore through the neutral axis of the joist. Provide steel joist hangers of proper size and type to receive the ends of all framed joists.

3.1.4.1 Floor (Ceiling) Framing

Except where otherwise indicated joists must have bearings not less than 4 inches on concrete or masonry and 1-1/2 inches on wood or metal. Joists, trimmers, headers, and beams framing into carrying members at the same relative levels must be carried on joist hangers. Joists must be lapped and spiked together at bearings or butted end-to-end with scab ties at joint and spiked to plates. Openings in floors must be framed with headers and trimmers. Headers carrying more than two tail joists and trimmers supporting headers carrying more than one tail joist must be doubled, unless otherwise indicated. Joists built into masonry must be provided with standard steel wall bearing boxes. Install engineered wood joists in accordance with distributor's instructions.

3.1.4.2 Doubled Joists

Provide under bearing walls and partitions running parallel with the floor joists, around stairways, and at other openings where joists are cut and framed. Double, space for clearance, block apart 4 feet on center, rigidly frame, and spike together joists under partitions that are to receive ducts, pipes, and conduits.

3.1.4.3 Tie Straps

For joists supported by the lower flange of steel beams, provide straps at

SECTION 06 10 00 Page 27 every fourth joist and the corresponding fourth joist on the opposite side. Tie joists across the top of the steel beam with a steel strap.

Form straps to lie flat across the top of the beam and twist at the ends to provide flat contact with the side of each joist. Nail each strap at each end with three 10-penny nails spaced 2 inches o.c.

3.1.4.4 Joist Anchors

Provide anchors for each fourth joist supported by a masonry wall. Build wall end of anchors into the wall. Nail anchor to the joist with three 10-penny nails spaced 2 inches o.c. Anchor the first three joists parallel to concrete or masonry walls at bridging points, but not less than 8 feet o.c. from end walls. Let anchors into the tops of each joist and spike to the top of joist with one 10-penny nail. Extend anchors at least 8 inches into the wall.

3.1.5 Bridging

Provide bridging for floor and ceiling joists and for roof rafters having slopes of less than 1/3. Locate bridging as indicated and as specified herein. Provide bridging for spans greater than 6 feet, but do not exceed 8 feet maximum spacing between rows of bridging. Install rows of bridging uniformly. Provide metal or wood cross-bridging, except where solid bridging is indicated. Do not nail the bottom end of cross-bridging until the subfloor has been laid.

3.1.5.1 Wood Cross-Bridging

Provide wood cross-bridging not less than 2 by 4 nominal size. Nail wood cross-bridging at each end with three 8-penny nails for 2 by thick material.

3.1.5.2 Metal Cross-Bridging

Must be the manufacturer's standard product, not less than 16 gage before forming and coating. Metal bridging must be the compression type, lodged into or nailed to the wide faces of opposite joists at points diagonally across from each other near the bottoms and tops of joists.

3.1.6 Subflooring

3.1.6.1 Plywood, Structural-Use, and OSB Panels

Apply best side up with the grain of outer plies or the long dimension at right angles to joists. Stagger end joints and locate over the centerline of joists. Support panel edges by nominal 2 by 4 members framed between joists so the edge joints of subfloor occur over the centerline of blocking. Allow 1/8 inch spacing at panel ends and 1/4 inch at panel edges. Panels must be continuous over two or more spans. Nail panels 6 inches o.c. at supported edges and 10 inches o.c. over intermediate bearing. Nails must be 8-penny common or 6-penny threaded. Provide at least 1/2 inch clearance between subflooring and masonry or concrete walls. Subflooring may be installed with adhesive conforming to ASTM D3498 and nails spaced at 12 inches on center unless otherwise shown.

3.1.6.2 Combination…