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IDIQ ROOF MAINTENANCE/REPAIR/REPLACEMENT VNVP 111080

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November 2011

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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 FOREST & PAPER ASSOCIATION (AF&PA)

AF&PA T10 (2001) Wood Frame Construction Manual for One- and Two-Family

Dwellings

AF&PA T101 (2001) National Design Specification (NDS) for Wood Construction

AMERICAN LUMBER STANDARDS COMMITTEE (ALSC)

ALSC PS 20 (1970) American Softwood Lumber Standard

AMERICAN WOOD PROTECTION ASSOCIATION (AWPA)

AWPA BOOK (2009) AWPA Book of Standards

AWPA M2 (2007) Standard for Inspection of Treated Wood Products

AWPA M6 (2007) Brands Used on Forest Products

AWPA P5 (2009) Standard for Waterborne Preservatives

AWPA T1 (2009) Use Category System: Processing and Treatment Standard

AWPA U1 (2009) Use Category System: User Specification for Treated Wood

APA - THE ENGINEERED WOOD ASSOCIATION (APA)

APA E30 (2005) Engineered Wood Construction Guide

APA E445S (2001; R 2002) Performance Standards and Qualification Policy for

Structural-Use Panels (APA PRP-108)

APA F405L (1999) Performance Rated Panels

APA PS 1 (1995) Voluntary Product Standard for Construction and Industrial

Plywood

APA PS 2 (2004) Voluntary Product Standard for Wood-Based Structural-Use

Panels

ASME INTERNATIONAL (ASME)

ASME B18.2.1. (1996; R 2005) Square and Hex Bolts and Screws (Inch Series)

ASME B18.2.2. (1987; R 2005) Standard for Square and Hex Nuts

ASME B18.6.1. (1981; R 2008) Wood Screws (Inch Series)

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ASTM INTERNATIONAL (ASTM)

ASTM A 307 (2007b) Standard Specification for Carbon Steel Bolts and Studs, 60

000 PSI Tensile Strength

ASTM A 687 (1993) Standard Specification for High-Strength Nonheaded Steel

Bolts and Studs

ASTM D 6330 (1998; R 2008) Standard Practice for Determination of Volatile

Organic Compounds (Excluding Formaldehyde) Emissions from Wood-Based

Panels Using Small Environmental Chambers Under Defined Test Conditions

ASTM F 1667 (2005) Driven Fasteners: Nails, Spikes, and Staples

FM GLOBAL (FM)

FM DS 1-49 (2000) Perimeter Flashing

FOREST STEWARDSHIP COUNCIL (FSC)

FSC STD 01 001 (2000) Principles and Criteria for Forest Stewardship

GREEN SEAL (GS)

GS-36 (2000) Commercial Adhesives

INTERNATIONAL CODE COUNCIL (ICC)

ICC IBC (2009; Errata First Printing) International Building Code

NATIONAL HARDWOOD LUMBER ASSOCIATION (NHLA)

NHLA Rules (2007) Rules for the Measurement & Inspection of Hardwood &

Cypress

NORTHEASTERN LUMBER MANUFACTURERS ASSOCIATION (NELMA)

NELMA Grading Rules (2006) 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 (1989; R 2005) 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 (2002) Standard Grading Rules for Southern Pine Lumber

TRUSS PLATE INSTITUTE (TPI)

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TPI HIB (1991) Commentary and Recommendations for Handling, Installing and

Bracing Metal Plate Connected Wood Trusses

U.S. GENERAL SERVICES ADMINISTRATION (GSA)

CID A-A-1923 (Rev A; Notice 1) Shield, Expansion (Lag, Machine and Externally

Threaded Wedge Bolt Anchors)

CID A-A-1924 (Rev A; Notice 1) Shield, Expansion (Self Drilling Tubular

Expansion Shell Bolt Anchors

CID A-A-1925 (Rev A; Notice 1) Shield Expansion (Nail Anchors)

FS FF-B-588 (Rev E) Bolt, Toggle: and Expansion Sleeve, Screw

FS FF-T-1813 (Basic) Tack

U.S. GREEN BUILDING COUNCIL (USGBC)

LEED (2002; R 2005) Leadership in Energy and Environmental Design(tm) Green

Building Rating System for New Construction (LEED-NC)

WEST COAST LUMBER INSPECTION BUREAU (WCLIB)

WCLIB 17 (2000) Standard Grading Rules

WESTERN WOOD PRODUCTS ASSOCIATION (WWPA)

WWPA G-5 (1998) Western Lumber Grading Rules

1.2. SUBMITTALS: The following shall be submitted in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

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

Local/Regional Materials; (LEED)

Submit documentation indicating distance between manufacturing facility and the project site. Indicate distance of raw material origin from the project site.

Indicate relative dollar value of local/regional materials to total dollar value of products included in project.

Salvaged Lumber; (LEED)

Recovered Lumber; (LEED)

Documentation certifying products are from salvaged/recovered lumber sources. Indicate relative dollar value of salvaged content products to total dollar value of products included in project.

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Underlayment; (LEED)

Documentation indicating type of biobased material in product and biobased content. Indicate relative dollar value of biobased content products to total dollar value of products included in project. Documentation indicating relative dollar value of rapidly renewable materials to total dollar value of products included in project. Submit documentation indicating percentage of post-industrial and post-consumer recycled content per unit of product. Indicate relative dollar value of recycled content products to total dollar value of products included in project. Where recycled lumber materials are used for structural applications, include lumber certification and quality grading.

Engineered wood products; (LEED)

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

Forest Stewardship Council (FSC) Certification; (LEED)

Certificates of grade

Manufacturer's certificates (approved by an American Lumber Standards approved agency) attesting that lumber and material not normally grade marked meet the specified requirements. Certificate of Inspection for grade marked material by an American Lumber Standards Committee (ALSC) recognized inspection agency prior to shipment.

Preservative treatment

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. Remove defective and damaged materials and provide new materials. Store separated reusable wood waste convenient to cutting station and area of work.

1.4. GRADING AND MARKING: Finger-jointed lumber shall not be used.

1.4.1. Lumber:

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1.4.1.1. Finger jointed lumber shall not be used.

1.4.1.2. 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 shall be certified by the Board of

Review, American Lumber Standards Committee, to grade the species used.

Surfaces that are to be exposed to view shall 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. 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 shall identify the plywood by species group or span rating, exposure durability classification, grade, and compliance with APA PS 1.Surfaces that are to be exposed to view shall not bear grademarks or other types of identifying marks.

1.4.3. Preservative-Treated Lumber and Plywood: The Contractor shall be responsible for the quality of treated wood products. Each treated piece shall be inspected in accordance with AWPA M2 and permanently marked or branded, by the producer, in accordance with AWPA M6. The Contractor shall provide Contracting Officer and the construction inspector 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.

1.4.4. 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 shall be surfaced four sides. Size references, unless otherwise specified, are nominal sizes, and actual sizes shall 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 shall be as follows at the time of delivery to the job site:

a. Framing lumber and boards - 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 shall be in accordance with standard under which the product is produced

1.7. PRESERVATIVE TREATMENT:

1.7.1. Treat wood products with waterborne wood preservatives conforming to AWPA

P5. Pressure treatment of wood products shall conform to the requirements of AWPA

BOOK Use Category System Standards U1 and T1. Pressure-treated wood products shall not contain arsenic, chromium, or other agents classified as carcinogenic, probably

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November 2011 carcinogenic, or possibly carcinogenic to humans (compounds in Groups 1, 2A, or 2B) by the International Agency for Research on Cancer (IARC), Lyon, France. Pressure-treated wood products shall not exceed the limits of the U.S. EPA's Toxic Characteristic

Leaching Procedure (TCLP), and shall not be classified as hazardous waste. Submit certification from treating plant stating chemicals and process used and net amount of preservatives retained are in conformance with specified standards.

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 shall be air or kiln dried after treatment. Specific treatments shall be verified by the report of an approved independent inspection agency, or the AWPA Quality Mark on each piece. Do not incise surfaces of lumber that will be exposed. Minimize cutting and avoid breathing sawdust. 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. All lumber and woodwork shall be preservative treated. The following items shall 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.

1.7.2. Existing Structures: Use borate, permathrin, or a sodium silicate wood mineralization process to treat wood. Use borate for interior applications only.

1.7.3. New Construction: Use a boron-based preservative conforming to AWPA P18, sodium silicate wood mineralization process, or Ammoniacal Copper Quaternary

Compound to treat wood. Use boron-based preservatives for above-ground applications only.

1.8. QUALITY ASSURANCE

1.8.1. Drawing Requirements: Submit drawings for all proposed modifications of structural members. Do not proceed with modifications until the submittal has been approved.

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

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1.8.3. Certificates of Grade: Submit certificates attesting that products meet the grade requirements specified in lieu of grade markings where appearance is important and grade marks will deface material.

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. Lumber shall be FSC-certified.

2.1.2. Salvaged Lumber: Provide salvaged lumber where specified. Unless otherwise noted, salvaged lumber shall be delivered clean, denailed, and free of paint, finish materials, and other contamination.

2.1.3. Recovered Lumber: Not Used.

2.1.4. Engineered Wood Products: Products shall be FSC-certified and shall contain no added urea-formaldehyde. Determine Volatile Organic Compounds (VOCs), excluding formaldehyde, emitted from manufactured wood-based panels in accordance with

ASTM D 6330.

2.1.5. Natural Decay- and Insect-Resistant Wood: Naturally durable wood shall be

FSC-certified or salvaged. An occasional piece with corner sapwood shall be permitted if 90 percent or more of the width of each side on which the sapwood occurs is heartwood.

2.2. LUMBER:

2.2.1. Framing Lumber:

2.2.1.1. Finger jointed lumber shall not be used.

2.2.1.2. 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 shall be one of the species listed in the table below.

Minimum grade of species shall be as listed.

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

All Species:

Standard Light

Framing or No. 3

Structural Light

Framing (Stud Grade for 2x4 nominal size, All Species:

No. 3 Common

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Grading

Rules

Species Framing Board

Lumber

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

10 feet and shorter)

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

SPIB 1003

standard grading rules

Southern Pine 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 astern 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 Redwood All Species: Construction Heart

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Grading

Rules

Species Framing Board

Lumber standard specifications

Standard Light

Framing or No. 3

Structural Light

Framing (Stud Grade for 2x4 nominal size, 10 feet and shorter)

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

Cypress No. 2 Dimension No. 2 Common

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

PANELS: APA PS 1, APA PS 2, APA E445S, and APA F405L respectively.

2.3.1. Roof Sheathing:

2.3.1.1. Plywood: C-D Grade, Exposure 1, with an Identification Index of not less than 24/0. FSC-certified. Provide exterior grade particleboard with phenol resin for interior and exterior applications.

2.3.1.2. Structural-Use Panel Sheathing grade with durability equivalent to

Exposure 1, Span Rating of 24/0 or greater.

2.4. OTHER MATERIALS:

2.4.1. Roof Decking: Roof decking shall be commercial grade. Thickness of new decking shall match thickness of adjacent decking.

2.4.2. Miscellaneous Wood Members:

2.4.2.1. Blocking: Blocking shall be standard or number 2 grade.

2.4.3. Adhesives: Comply with applicable regulations regarding toxic and hazardous materials, GS-36, SCAQMD Rule 1168, and as specified.

2.5. ROUGH HARDWARE: Unless otherwise indicated or specified, rough hardware shall be of the type and size necessary for the project requirements. Sizes, types, and spacing of fastenings of manufactured building materials shall be as recommended by the product manufacturer unless otherwise indicated or specified. When possible, Fasteners shall be fabricated from 100 percent re-melted steel. Rough hardware exposed to the weather or embedded in or in contact with preservative treated wood, exterior masonry, or concrete walls or slabs shall be zinc-coated.

2.5.1. Bolts, Nuts, Studs, and Rivets: ASME B18.2.1, ASME B18.5.2.1M, ASME

B18.5.2.2M, ASME B18.2.2, and ASTM A 687.

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2.5.2. Anchor Bolts: ASTM A 307, size as indicated, complete with nuts and washers.

2.5.3. Expansion Shields: CID A-A-1923, CID A-A-1924, and CID A-A-1925. Except as shown otherwise, maximum size of devices shall be 3/8 inch.

2.5.4. Lag Screws and Lag Bolts: ASME B18.2.1.

2.5.5. Toggle Bolts: FS FF-B-588.

2.5.6. Wood Screws: ASME B18.6.1.

2.5.7. Nails: For sheathing and subflooring, length of nails shall be sufficient to extend

1 inch into supports. In general, 8-penny or larger nails shall be used for nailing through

1 inch thick lumber and for toe nailing 2 inch thick lumber; 16-penny or larger nails shall be used for nailing through 2 inch thick lumber. Nails used with treated lumber and sheathing shall be galvanized. Nailing shall be in accordance with the recommended nailing schedule contained in AF&PA T10. Where detailed nailing requirements are not specified, nail size and spacing shall be sufficient to develop an adequate strength for the connection. The connection's strength shall be verified against the nail capacity tables in AF&PA T101. Reasonable judgment backed by experience shall 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 shall be used.

2.5.8. Wire Nails: ASTM F 1667.

2.5.9. Tacks: FS FF-T-1813.

2.4.10. 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.

2.4.11. Toothed Rings and Shear Plates: AF&PA T101.

2.5.12. Panel Edge Clips: Extruded aluminum or galvanized steel, H-shaped clips to prevent differential deflection of roof sheathing.

PART 3 - EXECUTION:

3.1. INSTALLATION: Conform to AF&PA T10 and install in accordance with the

National Association of Home Builders (NAHB) Advanced Framing Techniques: Optimum

Value Engineering, 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. Provide adequate support as appropriate to the application, climate, and modulus of elasticity of the product. 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 shall be in accordance with the Nailing Schedule contained in ICC IBC; perform bolting in an approved manner. Spikes, nails, and bolts shall

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November 2011 be drawn up tight. Provide 2 inch minimum clearance between chimneys and wood framing;

provide 4 inch minimum clearance at fireplaces. Fill the spaces with strips of approved noncombustible material. Use slate or steel shims when leveling joists, beams, and girders on masonry or 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 shall be positioned and leveled with grout. The joist, beam, or girder shall then be placed on the plate. When joists, beams, and girders are set into masonry or concrete, a pocket shall be formed into the wall. The joist, beam, or girder shall then be placed into the pocket and leveled with a steel shim.

3.1.1. Roof Framing or Rafters: Tops of supports or rafters shall form a true plane.

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

Rafters shall be toe-nailed to ridge, valley, or hip members with at least three 8-penny nails. Rafters shall be braced to prevent movement until permanent bracing, decking or sheathing is installed. Hip and valley rafters shall be secured to wall plates by clip angles. Openings in roof shall be framed with headers and trimmers. Unless otherwise indicated, headers carrying more than two rafters and trimmers supporting headers carrying more than one rafter shall be double. Hip rafters longer than the available lumber shall be butt jointed and scabbed. Valley rafters longer than the available lumber shall be double, with pieces lapped not less than 4 feet and well spiked together.

Trussed rafters shall be installed in accordance with TPI HIB. Engineered wood joists shall be installed in accordance with distributor's instructions.

3.1.2. Wood Sheathing; Sheathing end joints shall be made over framing members and so alternated that there will be at least two boards between joints on the same support.

Each board shall bear on at least three supports. Boards shall be nailed at each support using two nails for boards 6 inches and less in width and three nails for boards more than 6 inches in width. Roof sheathing shall not be installed where roof decking is installed.

3.1.3. Plywood and Structural-Use Panel Roof Sheathing: Install with the grain of the outer plies or long dimension at right angles to supports. Stagger end joints and locate over the centerlines of supports. Allow 1/8 inch spacing at panel ends and 1/4 inch at panel edges. Nail panels with 8-penny common nails or 6-penny annular rings or screw-type nails spaced 6 inches O.C. at supported edges and 12 inches O.C. at intermediate bearings. Do not use staples in roof sheathing. Where the support spacing exceeds the maximum span for an unsupported edge, provide adequate blocking, tongue-and-groove edges, or panel edge clips, in accordance with APA E30.

3.2. MISCELLANEOUS;

3.2.1. Wood Roof Nailers, Edge Strips, Crickets, Curbs, and Cants: Provide sizes and configurations indicated or specified and anchored securely to continuous construction.

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3.2.1.1. Roof Nailing Strips: Provide roof nailing strips for roof decks. Apply nailing strips in straight parallel rows in the direction and spacing.

a. Surface-Applied Nailers: Shall be 3 inches wide and of thickness to finish flush with the top of the insulation. Anchor strips securely to the roof deck with powder actuated fastening devices or expansion shields and bolts, spaced not more than 24 inches O.C. On decks with slopes of one inch or more, provide surface applied wood nailers for securing insulation and for nailing of roofing felts.

b. Embedded Nailers: Shall be nominal 2 by 3 with 2 inch sides beveled. Set and anchor nailers to finish flush with the roof deck surface.

3.2.1.2. Roof Edge Strips and Nailers: Provide at perimeter of roof, around openings through roof, and where roofs abut walls, curbs, and other vertical surfaces. Except where indicated otherwise, nailers shall be 6 inches wide and the same thickness as the insulation. Anchor nailers securely to underlying construction. Anchor perimeter nailers in accordance with FM DS 1-49. Strips shall be grooved for edge venting; install at walls, curbs, and other vertical surfaces with a 1/4 to 1/2 inch air space.

3.2.1.3. Crickets, Cants, and Curbs: Provide cant strips, curbs for scuttles and ventilators, and wood nailers bolted to tops of concrete or masonry curbs and at expansion joints, specified, or necessary and of lumber.

3.2.2. Wood Blocking: Provide proper sizes and shapes at proper locations for the installation and attachment of wood and other finish materials, fixtures, equipment, and items indicated or specified.

3.2.3. Wood Furring: Provide where shown and as necessary for facing materials specified. Except as shown otherwise, furring strips shall be nominal one by 3, continuous, and spaced 16 inches O.C. Erect furring vertically or horizontally as necessary. Nail furring strips to masonry. Do not use wood plugs. Provide furring strips around openings, behind bases, and at angles and corners. Furring shall be plumb, rigid, and level and shall be shimmed as necessary to provide a true, even plane with surfaces suitable to receive the finish required. Form furring for cornices, offsets and breaks in walls or ceilings on 1 by 4 wood strips spaced 16 inches O.C.

3.2.4. Temporary Closures: Provide with hinged doors and padlocks and install during construction at exterior doorways and other ground level openings that are not otherwise closed. Cover windows and other unprotected openings with polyethylene or other approved material, stretched on wood frames. Provide dustproof barrier partitions to isolate areas as directed.

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