07 61 14 Steel Standing Seam Roofing-1111(Nov).pdf

IDIQ ROOF MAINTENANCE/REPAIR/REPLACEMENT VNVP 111080

07 61 14 Steel Standing Seam Roofing

Page 1 of 32 Pages

November 2011

07 61 14

STEEL STANDING SEAM ROOFING

PART 0 - INTENT

0.1. This section covers the requirements for steel standing seam roofing, a Structural

Standing Seam Metal Roofing Systems (SSMRS), i.e. Self-Supporting Systems designed to span from purlin to purlin at slopes as low as 1/4 inch per foot.

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 IRON AND STEEL INSTITUTE (AISI)

AISI SG03-3 (2002) Cold-Formed Steel Design Manual Set

ASTM INTERNATIONAL (ASTM)

ASTM A 1008/A 1008M (2009a) Standard Specification for Steel, Sheet, Cold-

Rolled, Carbon, Structural, High-Strength Low-Alloy and High-Strength Low-

Alloy with Improved Formability, Solution Hardened, and Bake Hardened

ASTM A 1011/A 1011M (2009b) Standard Specification for Steel, Sheet, and

Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy and High-

Strength Low-Alloy with Improved Formability and Ultra-High Strength

ASTM A 36/A 36M (2008) Standard Specification for Carbon Structural Steel

ASTM A 366/A 366M (1997e1) Standard Specification for Commercial Steel, Sheet, Carbon,(0.15 Maximum Percent Cold-Rolled

ASTM A 653/A 653M (2009a) Standard Specification for Steel Sheet, Zinc-Coated

(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip

Process

ASTM A 792/A 792M (2009a) Standard Specification for Steel Sheet, 55%

Aluminum-Zinc Alloy-Coated by the Hot-Dip Process

ASTM B 117 (2009) Standing Practice for Operating Salt Spray (Fog) Apparatus

ASTM D 1654 (2008) Evaluation of Painted or Coated Specimens Subjected to

Corrosive Environments

ASTM D 2244 (2009a) Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates

ASTM D 2247 (2002) Testing Water Resistance of Coatings in 100% Relative

Humidity

07 61 14 Steel Standing Seam Roofing

Page 2 of 32 Pages

November 2011

ASTM D 226/D 226M (2009) Standard Specification for Asphalt-Saturated

Organic Felt Used in Roofing and Waterproofing

ASTM D 4214 (2007) Standard Test Method for Evaluating the Degree of

Chalking of Exterior Paint Films

ASTM D 522 (1993a; R 2008) Mandrel Bend Test of Attached Organic Coatings

ASTM D 523 (2008) Standard Test Method for Specular Gloss

ASTM D 714 (2002; R 2009) Evaluating Degree of Blistering of Paints

ASTM D 968 (2005e1) Abrasion Resistance of Organic Coatings by Falling

Abrasive

ASTM E 1592 (2005) Structural Performance of Sheet Metal Roof and Siding

Systems by Uniform Static Air Pressure Difference

ASTM E 84 (2009c) Standard Test Method for Surface Burning Characteristics of

Building Materials

ASTM G 23 (1996) Operating Light-Exposure Apparatus (Carbon-Arc Type) With and Without Water for Exposure of Nonmetallic Materials

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL

ASSOCIATION (SMACNA)

SMACNA 1793 (2003) Architectural Sheet Metal Manual, 6th Edition

1.2. DEFINITIONS:

1.2.1. Field-Formed Seam: Seams of panels so configured that when adjacent sheets are installed the seam is sealed utilizing mechanical or hand seamers. Crimped (45 degree bend), roll formed (180 degree bend), double roll formed (2 - 180 degree bends), and roll and lock systems are types of field-formed seam systems.

1.2.2. Snap Together Seam: Panels so configured that the male and female portions of the seam interlock through the application of foot pressure or tamping with a mallet.

Snap-on cap configurations are a type of snap together system.

1.2.3. Pre-Formed: Formed to the final, less field-formed seam, profile and configuration in the factory.

1.2.4. Field-Formed: Formed to the final, less field-formed seam, profile and configuration at the site of work prior to installation.

1.2.5. Roofing System: The roofing system is defined as the assembly of roofing components, including roofing panels, flashing, fasteners, and accessories which, when assembled properly result in a watertight installation.

1.3. SYSTEM DESCRIPTION:

1.3.1. GENERAL: Contract drawings indicate the extent and general assembly details of the metal roofing and siding specified. Items and connections not indicated on drawings shall be designed by the metal roofing system manufacturer. Structural

07 61 14 Steel Standing Seam Roofing

Page 3 of 32 Pages

November 2011 roofing membranes shall be of such configuration as to provide the minimum section properties indicated herein. Metal roofing membranes shall be steel designed in accordance with the AISI publication, Specification for the Design of Cold-Formed

Steel Structural Members. The contractor shall provide and install all roof panels, equipment curbs, rake and eave fascia, custom flashing, ridge flashing, wall panels

(siding), sub-purlins, hat-channels, framing, girts, vent flashings, louvers, gable vents, ridge vents, soffits, hangars, brackets, gutters, downspouts and any and all related accessories and flashings to provide a complete and weather tight metal roofing/siding system.

1.3.1.1. Roof Slope Change: During the performance of the contract, the contractor will be required to install metal roofing systems that are at a steeper slope than the roofing system existing on the facility being reroofed. Increases in roof slope shall be accomplished by the installation of a steel structural framing system located between the existing roofing/framing system and the new metal roofing membrane.

Contractor shall provide the design of the steel structural framing system and the metal roofing membrane. Shop drawings for the steel structural framing system and metal roofing membrane shall be submitted for review and contracting officer’s approval. Shop Drawings shall be approved by contracting officer prior to commencing any field work on project

1.3.1.2. Experience Requirements: Applicator of Metal Roofing System shall be skilled in the trade with a minimum of (2) years experience in installation of metal roofing and siding, and shall be authorized (licensed) by the Metal Roofing/Siding

Manufacturer to install the proposed roofing system.

1.3.2. Design Requirements:

a. Panels shall be continuous lengths up to manufacturer's standard longest lengths, with no joints or seams, except where indicated or specified. Ribs of adjoining sheets shall be in continuous contact from eave to ridge. Individual panels of snap together type systems shall be removable for replacement of damaged material.

b. There shall be no exposed or penetrating fasteners except where shown on approved shop drawings. Fasteners into steel shall be stainless steel, zinc cast head, or cadmium plated steel screws inserted into predrilled holes. There shall be a minimum of two fasteners per clip. Single fasteners will be allowed when supporting structural members are prepunched or predrilled.

c. Snap together type systems shall have a capillary break and a positive side lap locking device. Field-formed seam type systems shall be mechanically locked closed by the manufacturer's locking tool. The seam shall include a continuous factory applied sealant when required by the manufacturer to withstand the wind loads specified.

d. Roof panel anchor clips shall be concealed and designed to allow for longitudinal thermal movement of the panels, except where specific fixed points are indicated. Provide for lateral thermal movement in panel configuration or with clips designed for lateral and longitudinal movement.

07 61 14 Steel Standing Seam Roofing

Page 4 of 32 Pages

November 2011

1.3.3. Design Conditions: The system shall be designed to resist positive and negative loads specified herein in accordance with the AISI SG03-3. Panels shall support walking loads without permanent distortion or telegraphing of the structural supports.

1.3.3.1. Wind Uplift:

1.3.3.1.1. Contractor shall determine appropriate pressures that apply to various portions of roof using MIL-HDBK 1002/2 for structural design and wind load information. Use criteria of local building code when their provisions exceed Air Force criteria. Insert calculated pressures in table;

regardless of calculated value, use 45 psf minimum for Class 90 systems.

1.3.3.1.2. The design uplift pressures for the roof system shall be computed and applied using a basic wind speed of 95 miles per hour (mph). Roof system and attachments shall resist the following wind loads, in pounds per square foot (psf):

Negative

a. At eaves 45 psf

b. At rakes 45 psf

c. At ridge 45 psf

d. At building corners 45 psf

e. At central areas 45 psf

1.3.3.1.3. The design uplift force for each connection assembly shall be that pressure given for the area under consideration, multiplied by the tributary load area of the connection assembly, and multiplied by the appropriate factor of safety, as follows:

a. Single fastener in a connection: 3.0

b. Two or more fasteners in each connection: 2.25

1.3.3.2. Roof Live Loads:

1.3.3.2.1. Contractor shall refer to MIL-HDBK 1002/2 for additional requirements.

1.3.3.2.2. Loads shall be applied on the horizontal projection of the roof structure. The minimum roof design live load shall be 20 psf.

1.3.3.3. Thermal Movement: System shall be capable of withstanding thermal movement based on a temperature range of 10 degrees F below zero degrees F and

180 degrees F.

1.3.3.4. Deflection: Panels shall be capable of supporting design loads between unsupported spans with deflection of not greater than L/180 of the span.

07 61 14 Steel Standing Seam Roofing

Page 5 of 32 Pages

November 2011

1.3.4. Structural Performance: The structural performance test methods and requirements of the Standing Seam Roofing Systems (SSRS) shall be in accordance with ASTM E 1592.

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

SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Roofing; G

SHOP DRAWINGS: Shop Drawings shall be approved by contracting officer prior to commencing any field work on project. Shop drawings shall be submitted for approval in accordance with the CONTRACT CLAUSES. Shop drawings shall consist of catalog cuts, design and erection drawings, coating and finishing specifications, and other data as necessary to clearly describe design, materials, sizes, layouts, construction details, fasteners, and erection.

Shop drawings shall indicate the structural properties of roofing membrane panels provided by the contractor. Section modulus and moment of inertia of steel sheet shall be determined in accordance with the AISI publication, Specification for the Design of Cold-Formed Steel Structural Members.

Submit roofing drawings to supplement the instructions and diagrams.

Drawings shall include design and erection drawings containing an isometric view of the roof showing the design uplift pressures and dimensions of edge, ridge and corner zones; and show typical and special conditions including flashings, materials and thickness, dimensions, fixing lines, anchoring methods, sealant locations, sealant tape locations, fastener layout, sizes, and spacing, terminations, penetrations, attachments, and provisions for thermal movement. Details of installation shall be in accordance with the manufacturer's Standard Instructions and details or the SMACNA 1793. Prior to submitting shop drawings, have drawings reviewed and approved by the manufacturer's technical engineering department.

SD-03 Product Data

Roofing panels; G

Attachment clips, G

Closures, G

Accessories

Fasteners

Sealants

Insulation, including joint sealing measures for vapor barrier facing

Sample warranty certificate; G

Submit for materials to be provided. Submit data sufficient to indicate conformance to specified requirements.

07 61 14 Steel Standing Seam Roofing

Page 6 of 32 Pages

November 2011

SD-04 Samples and descriptive data of materials proposed for use during the performance of the contract shall be submitted for approval. The following items shall, as a minimum, be submitted for approval:

Accessories: One sample of each type of flashing, rake fascia, eave fascia, ridge flashing, roof penetration flashing, closures, caps, gutter, gutter hangars, downspout and similar items. Sample size shall be sufficient to show construction and configuration.

Covering, Roof Panel: One piece of each type to be used, 9 inches long, full width, accompanied by certified laboratory test reports showing that the sheets to be furnished are produced under a continuing quality control program.

Fasteners: Two samples of each type to be used with statement regarding intended use.

Gaskets, Insulating Compounds, Tape Sealer or Spray Adhesive: Descriptive data, representative samples.

Sealant: One sample, approximately 1 pound, and descriptive data.

Thermal Spacer: One piece, 9 inches long.

Concealed Deck Clips: One each.

Sub-Purlin: One piece, 9 inches long.

Hat-Channel: One piece, 9 inches long.

Gutter: One piece, 9 inches long.

Gutter Hanger: One each.

Downspout: One piece, 9 inches long.

Downspout Hanger: One each.

Wall Panel (Siding): One piece, 9” long, full width.

Soffit Panel: One piece, 9” long, full width.

Hip Flashing: One piece, 9” long.

Ridge Flashing: One piece, 9” long.

Wall to Roof Flashing: One piece, 9” long.

SD-05 Design Data

Design calculations, G

SD-06 Test Reports

Field Inspection; G

Submit manufacturer's technical representative's field inspection reports as specified in paragraph entitled "Manufacturer's Field Inspection."

Structural performance tests

07 61 14 Steel Standing Seam Roofing

Page 7 of 32 Pages

November 2011

Finish tests

SD-07 Certificates

Manufacturer's Technical Representative's Qualifications

Statement of Installer's Qualifications

Submit documentation from roofing manufacturer proving the manufacturer's technical representative meets below specified requirements. Include name, address, telephone number, and experience record. Submit documentation proving the installer is factory-trained, has the specified experience, and authorized by the manufacturer to install the products specified.

Coil stock compatibility; G

Provide certification of coil compatibility with roll forming machinery to be used for forming panels without warping, waviness, and rippling not part of panel profile; to be done without damage, abrasion or marking of finish coating.

SD-08 Manufacturer's Instructions

Installation manual; G

Submit manufacturers printed installation manual, instructions, and standard details.

SD-11 Closeout Submittals

Information card

For each roofing installation, submit a typewritten card or photoengraved aluminum card containing the information listed on Form 1 located at the end of this section.

1.5. DESIGN CALCULATIONS: Provide design calculations prepared by a professional engineer specializing in structural engineering verifying that system supplied and any additional framing meets design load criteria indicated. Coordinate calculations with manufacturer's test results. Include calculations for:

Wind load uplift design pressure at roof locations specified in paragraph entitled "Wind

Uplift."

Clip spacing and allowable load per clip.

Fastening of clips to structure or intermediate supports.

Intermediate support spacing and framing and fastening to structure when required.

Allowable panel span at anchorage spacing indicated.

Safety factor used in design loading.

Governing code requirements or criteria.

Edge and termination details.

07 61 14 Steel Standing Seam Roofing

Page 8 of 32 Pages

November 2011

1.6. QUALITY ASSURANCE:

1.6.1. Preroofing Conference: After submittals are received and approved but before roofing and insulation work, including associated work, is preformed, the Contracting

Officer will hold a preroofing conference in order for the contractor to provide a briefing on the following:

a. The individual project drawings and specifications

b. Procedure for on site inspection and acceptance of the roofing substrate and pertinent structural details relating to the roofing system

c. Contractor's plan for coordination of the work of the various trades involved in providing the roofing system and other components secured to the roofing

d. Safety requirements: The preroofing conference shall be attended by the

Contractor and personnel directly responsible for the roofing and insulation installation, mechanical and electrical work, and the roofing manufacturer's technical representative. Conflicts among those attending the preroofing conference shall be resolved and confirmed in writing before roofing work, including associated work, is begun. The contractor shall prepare written minutes of the preroofing conference and submit to the Contracting Officer.

1.6.2. Manufacturer: The SSMRS shall be the product of a metal roofing industry -recognized manufacturer who has been in the practice of manufacturing SSMRS for a period of not less than 5 years and who has been involved in at least 5 projects similar in size and complexity to this project.

1.6.3. Manufacturer's Technical Representative: NOT USED.

1.6.4. Installer's Qualifications: The roofing system installer shall be factory-trained, approved by the metal roofing system manufacturer to install the system, and shall have a minimum of three years experience as an approved applicator with that manufacturer.

The applicator shall have applied five installations of similar size and scope as this project within the previous 5 years.

1.6.5. Single Source: Roofing panels, clips, closures, and other accessories shall be standard products of the same manufacturer; shall be the latest design by the manufacturer; and shall have been designed by the manufacturer to operate as a complete system for the intended use.

1.6.6. Laboratory Tests For Panel Finish: The term "appearance of base metal" refers to the metal coating on steel. Panels shall meet the following test requirements:

a. Formability Test: When subjected to a 180 degree bend over a 1/8 inch diameter mandrel in accordance with ASTM D 522, exterior coating film shall show only slight microchecking and no loss of adhesion.

b. Accelerated Weathering Test: Withstand a weathering test for a minimum of

2000 hours in accordance with ASTM G 23, Method 1 without cracking, peeling, blistering, loss of adhesion of the protective coating, or corrosion of the base metal.

07 61 14 Steel Standing Seam Roofing

Page 9 of 32 Pages

November 2011

Protective coating that can be readily removed from the base metal with a penknife blade or similar instrument shall be considered to indicate loss of adhesion.

c. Chalking Resistance: After the 2000-hour weatherometer test, exterior coating shall not chalk greater than No. 8 rating when measured in accordance with ASTM

D 4214 test procedures.

d. Color Change Test: After the 2000-hour weatherometer test, for colors such as white, beige, and tan, the exterior coating color change shall not exceed 2 NBS units when measured in accordance with ASTM D 2244 test procedure. After the

3000-hour weatherometer test, for heaver pigmented colors, the exterior coating color change shall not exceed 5 NBS units when measured in accordance with

ASTM D 2244 test procedure.

e. Salt Spray Test: Not Required.

f. Abrasion Resistance Test for Color Coating: Not Required.

g. Humidity Test: When subjected to a humidity cabinet test in accordance with

ASTM D 2247 for 1000 hours, a scored panel shall show no signs of blistering, cracking, creepage, or corrosion.

h. Gloss Test: The gloss of the finish shall be 30 plus or minus 5 at an angle of 60 degrees, when measured in accordance with ASTM D 523.

1.7. WARRANTY: Furnish manufacturer's no-dollar-limit materials and workmanship warranty for the roofing system. The warranty period shall be not less than 20 years from the date of Government acceptance of the work. The warranty shall be issued directly to the

Government. The warranty shall provide that if within the warranty period the metal roofing system becomes non-watertight or shows evidence of corrosion, perforation, rupture or excess weathering due to deterioration of the roofing system resulting from defective materials or installed workmanship the repair or replacement of the defective materials and correction of the defective workmanship shall be the responsibility of the roofing system manufacturer. Repairs that become necessary because of defective materials and workmanship while roofing is under warranty shall be performed within 7 days after notification, unless additional time is approved by the Contracting Officer. Failure to perform repairs within the specified period of time will constitute grounds for having the repairs performed by others and the cost billed to the manufacturer. The Contractor shall also provide a 2 year contractor installation warranty.

1.8. DELIVERY, STORAGE AND HANDLING: Deliver, store, and handle preformed panels, bulk roofing products and other manufactured items in a manner to prevent damage or deformation.

1.8.1. Delivery: Provide adequate packaging to protect materials during shipment.

Crated materials shall not be uncrated until ready for use, except for inspection.

Immediately upon arrival of materials at the jobsite, inspect materials for damage, dampness, and staining. Damaged or permanently stained materials that cannot be restored to like-new condition shall be replaced with satisfactory material. If materials are wet, remove the moisture and re-stack and protect the panels until used.

07 61 14 Steel Standing Seam Roofing

Page 10 of 32 Pages

November 2011

1.8.2. Storage: Stack materials on platforms or pallets and cover with tarpaulins or other suitable weathertight covering which prevents water trapping or condensation.

Store materials so that water which might have accumulated during transit or storage will drain off. Do not store the panels in contact with materials that might cause staining, such as mud, lime, cement, fresh concrete or chemicals. Protect stored panels from wind damage.

1.8.3. Handling: Handle material carefully to avoid damage to surfaces, edges and ends.

PART 2 - PRODUCTS:

2.1. ROOFING PANELS: Panels shall have interlocking ribs for securing adjacent sheets.

System for securing the roof covering to structural framing members shall be concealed clip fastening system with no fasteners penetrating the panels except at the ridge or eave, rakes, penetrations, and end laps. Backing plates and ends of panels at end laps shall be predrilled or prepunched; factory prepare ends of panels to be lapped by trimming part of seam, die-setting or swaging ends of panels. Length of sheets shall be sufficient to cover the entire length of any unbroken roof slope when such slope is 30 feet or less. When length of run exceeds 30 feet, each sheet in the run shall extend over two or more spans. Sheets longer than 30 feet may be furnished if approved by the Contracting Officer. Width of sheets shall provide not less than 12 inches of coverage in place. Height of corrugations of adjacent roof sheets shall be not less than 2.25 inches (nominal). Make provisions for expansion and contraction at either ridge or eave, consistent with the type of system to be used. Panels from coil stock shall be formed without warping, waviness or ripples not part of the panel profile and shall be free of damage to the finish coating system.

2.1.1. Material: Zinc-coated steel conforming to ASTM A 653/A 653M, Z275 G90 coating designation or aluminum-zinc alloy coated steel conforming to ASTM A 792/A

792M, AZ 165 AZ 55 coating. Minimum thickness to be 0.023 inch thick (24 gage) minimum except when mid field of roof is subject to design wind uplift pressures of 60 psf or greater, entire roof system shall have a minimum thickness of 0.030 inch (22 gage). Prior to shipment, treat mill finish panels with a passivating chemical and oil to inhibit the formation of oxide corrosion products. Dry, retreat, and re-oil panels that have become wet during shipment or storage but have not started to oxidize.

2.1.2. Texture: Smooth with raised intermediate ribs for added stiffness.

2.1.3. Finish: Factory color finish.

2.1.3.1. Factory Color Finish: Provide factory applied, thermally cured coating to exterior and interior of metal roof and wall panels and metal accessories. Provide exterior finish top coat of 70 percent resin polyvinyldene fluoride with not less than

0.8. mil dry film thickness. Provide exterior primer standard with panel manufacturer with not less than 0.8 mil dry film thickness. Interior finish shall consist of the same coating and dry film thickness as the exterior coating. Provide exterior and interior coating meeting test requirements specified below. Tests shall

07 61 14 Steel Standing Seam Roofing

Page 11 of 32 Pages

November 2011 have been performed on the same factory finish and thickness provided. Provide clear factory edge coating on all factory cut or unfinished edges.

2.2. INTERMEDIATE SUPPORTS: Fabricate panel subgirts, subpurlins, T-bars, Z-bars and tracks from galvanized steel conforming to ASTM A 653/A 653M, Z275 G90, Grade D

(16 gage and heavier), Grade A (18 gage and lighter); or steel conforming to ASTM A 36/A

36M, ASTM A 1011/A 1011M , or ASTM A 1008/A 1008M prime painted with zinc-rich primer. Size, shape, thickness and capacity as required to meet the load, insulation thickness, and deflection criteria specified.

2.3. ATTACHMENT CLIPS: Fabricate clips from ASTM A 366/A 366M, ASTM A

1011/A 1011M, or ASTM A 1008/A 1008M steel hot-dip galvanized in accordance with

ASTM A 653/A 653M, Z275 G 90, or Series 300 stainless steel. Size, shape, thickness and capacity as required to meet the load, insulation thickness and deflection criteria specified.

2.4. ACCESSORIES: Sheet metal flashings, gutters, downspouts, trim, moldings, closure strips, pre-formed crickets, caps, equipment curbs, and other similar sheet metal accessories used in conjunction with preformed metal panels shall be of the same material as used for the panels. Provide metal accessories with a factory color finish to match the roofing panels, except that such items which will be concealed after installation may be provided without the finish if they are stainless steel. Metal shall be of a thickness not less than that used for the panels. Thermal spacer blocks and other thermal barriers at concealed clip fasteners shall be as recommended by the manufacturer except that wood spacer blocks are not allowed.

2.4.1. Closures:

2.4.1.1. Rib Closures: Corrosion resisting steel, closed-cell or solid-cell synthetic rubber, neoprene or polyvinyl chloride pre-molded to match configuration of rib opening. Material for closures shall not absorb water.

2.4.1.2. Ridge Closures: Metal-clad foam or metal closure with foam secondary closure matching panel configuration for installation on surface of roof panel between panel ribs at ridge and headwall roof panel flashing conditions and terminations. Foam material shall not absorb water.

2.4.2. Fasteners: Zinc-coated steel, corrosion resisting steel, zinc cast head, or nylon capped steel, type and size specified below or as otherwise approved for the applicable requirements. Design the fastening system to withstand the design loads specified.

Exposed fasteners shall be gasketed or have gasketed washers on the exterior side of the covering to waterproof the penetration. Washer material shall be compatible with the covering; have a minimum diameter of 3/8 inch for structural connections; and gasketed portion of fasteners or washers shall be neoprene or other equally durable elastomeric material approximately 1/8 inch thick.

2.4.2.1. Screws: Not smaller than No. 14 diameter if self-tapping type and not smaller than No. 12 diameter if self-drilling and self-tapping.

2.4.2.2. Bolts: Not smaller than 1/4 inch diameter, shouldered or plain shank as required, with proper nuts.

07 61 14 Steel Standing Seam Roofing

Page 12 of 32 Pages

November 2011

2.4.2.3. Automatic End-Welded Studs: Automatic end-welded studs shall be shouldered type with a shank diameter of not smaller than 3/16 inch and cap or nut for holding covering against the shoulder.

2.4.2.4. Explosive Driven Fasteners: Fasteners for use with explosive actuated tools shall have a shank diameter of not smaller than 0.145 inch with a shank length of not smaller than 1/2 inch for fastening to steel and not smaller than one inch for fastening to concrete.

2.4.2.5. Rivets: Blind rivets shall be stainless steel with 1/8 inch nominal diameter shank. Rivets shall be threaded stem type if used for other than the fastening of trim. Rivets with hollow stems shall have closed ends.

2.4.3. Sealants: Elastomeric type containing no oil or asphalt. Exposed sealant shall cure to a rubberlike consistency. Concealed sealant shall be the non-hardening type.

Seam sealant shall be factory-applied, non-skinning, non-drying, and shall conform to the roofing manufacturer's recommendations. Silicone-based sealants shall not be used in contact with finished metal panels and components unless approved otherwise by the

Contracting Officer.

2.4.4. GASKETS AND INSULATING COMPOUNDS: Nonabsorptive and suitable for insulating contact points of incompatible materials. Insulating compounds shall be nonrunning after drying.

2.5. THERMAL INSULATION:

2.5.1. Insulation shall be as recommended by manufacturer, and at least batts with a minimum thickness on 1 1/2 inches in order to minimize condensation on underside of roofing sheets and for sound attenuation. Spacer blocks shall also be required.

Insulation thickness shall not exceed four inches.

2.5.2. Flexible blanket, rigid, or semi-rigid faced with a flexible vapor retarder.

Insulation and facing shall have a flame-spread rating of 50 or less in accordance with

ASTM E 84. Vapor retarder facing shall have a permeance rating of 0.05 perm or less.

Provide a thermal resistance "R" value of R 19 or more. Exposed insulation shall have a white nondusting and nonshedding finish. Facings and finishes shall be factory-applied.

2.6. UNDERLAYMENT FOR WOOD SUBSTRATES: ASTM D 226/D 226M, Type I perforated, covered by water-resistant rosin sized building paper.

2.7. LINER PANELS: Fabricate liner panels of the same material as roof panels, and formed or patterned to prevent waviness and distortion. Liner panels shall have a factory applied, one mil thick minimum painted coating on the inside face and a prime coat on the liner side.

2.8. RETROFIT PRODUCTS:

2.8.1. PAINT:

2.8.1.1. Primer: Primer shall comply with FS TT-P-645, PRIMER, PAINT, ZINC-

MOLYBDATE, ALKYD TYPE (for priming existing ferrous and aluminum surfaces). Color shall vary from finish coat.

07 61 14 Steel Standing Seam Roofing

Page 13 of 32 Pages

November 2011

2.8.1.2. Enamel: Enamel shall comply with FS TT-E-489, ENAMEL, ALKYD, GLOSS, LOW VOC CONTENT, (for use as directed, but normally for painting existing ferrous that are an objectionable color or are deteriorated or for painting selected aluminum surfaces when mill finish is objectionable when used with prefinished trim).

2.8.1.3. High Temperature Enamel: High temperature enamel shall comply with

FS TT-P-28, Paint, Aluminum, Heat Resisting (1200 F), (for use as directed, but normally for painting hot stacks when mil finish trim is specified).

2.8.2. SPLASH PANS

2.8.2.1. CONCRETE SPLASH BLOCKS: Concrete splash blocks shall be pre-cast concrete as shown on the drawings.

2.8.2.2. SPLASH PANS: : Splash pans shall be fabricated of 0.040” aluminum sheet. All seams and corners shall be welded.

2.8.3. GUY WIRE PACKAGE:

2.8.3.1. Guy Wire Anchors: Guy wire anchors shall be heavy 3/8 inch diameter galvanized eye bolts.

2.8.3.2. Guy Wire: Guy wire shall be 1/8 inch diameter 1 x 7 single strand, Multi-stranded stainless steel wire rope. McMaster-Carr #3458T17 or an approved

2.8.3.3. Wire Rope Thimbles: Wire rope thimbles shall be stainless steel 1/8 inch size. McMaster-Carr #8914T23 or an approved equal.

2.8.3.4. Wire Rope Clips: Wire rope clips shall be galvanized finished and have steel bolt and nuts with malleable iron saddle 1/8 inch size. McMaster-Carr

#3465T26 or an approved equal. Minimum of two clips shall be used at each thimble.

2.8.3.5. Turnbuckles: Turnbuckles shall be 1/4 inch, double eye, and have stainless steel fittings and aluminum bodies. McMaster-Carr #3009532 or an approved equal.

2.8.4. METAL DECK: Metal deck shall be galvanized or prime painted and shall be configured, be of identical gauge, and be and finished to match the metal deck existing of the facility.

2.8.5. FINISHES: Metal roof covering panels, wall panels (siding), fascia, flashings, gutters, downspouts and other components, used in the roofing system, and exposed to view shall be finished using one of the following.

2.8.5.1. Paint-Finished Components: Paint-finished components shall be steel, coated on both sides by the continuous hot dip method, with an aluminum-zinc alloy (Galvalume), a registered trademark of the Bethlehem Steel Corporation) at approximately 45% zinc and 55% aluminum exhibiting a triple spot minimum of

0.55 ounce per square foot as determined by the triple spot test per ASTM A 792.

Roof covering shall be 24 gauge, minimum thickness. After fabrication, paint-

07 61 14 Steel Standing Seam Roofing

Page 14 of 32 Pages

November 2011 finished components shall be painted on the weathering side with a factory applied, 1 mil, KYNAR based finish. The painted finish shall have a 20-year factory warranty against fading, chipping, peeling, and rusting, scaling and other effects of weathering, and shall also warrant against rusting of the base metal.

2.8.6. METAL ROOF COVERING PANELS: All metal roof covering panels shall be fabricated of 24 gauge minimum thickness steel sheet, structural in design and not requiring the uniform support offered by a roof deck. The weathering side of paint-finished roofing panels shall be the manufacturer’s standard “Bronze” color most nearly matching color number 20099, as contained in Federal Standard (Fed-Std) 595C. Color of Galvalume panels shall be as manufactured. System for securing the roof covering to structural framing members shall be a sliding concealed clip fastening system with non-membrane-penetrating fasteners. Concealed clip fastener system shall have no fasteners exposed or penetrating the panels except penetrating fasteners will be permitted at ridge, eave, rake and deck penetration flashings. Roofing system shall have a positive means of attaching the concealed clip fastening system to the steel roof panels at the interlocking joint. Ridge assembly shall allow for expansion and contraction due to temperature changes. Endwall flashings shall allow for movement between the roof and walls due to temperature changes. Unless specifically permitted otherwise, roof covering panels shall be continuous from eave to ridge, with no end laps or splices, with joining the panels at a joint perpendicular to the interlocking ribs not being permitted.

Width of sheets with interlocking ribs shall provide not less than 16 inches nor more than 24 inches of coverage in place. Height of all corrugations at standing ribs of interlocking panels shall be not less than 1 inch. Roof panels shall be permanently attached to roof clips that securely attach the roof system to the structural system while allowing the entire roof to move with the forces caused by thermal expansion and contraction. All sheets shall be either square-cut or miter-cut. Structural panels, when assembled on sub-purlins at 5'-0" on center, shall have a tested and certified load capacity of 70 lb/SF when limited to a L/180 deflection and 45 lb/SF when limited to a

L/240 deflection. Metal roofing systems shall have a UL wind uplift classification 90 rating when tested in accordance with UL 580 to ensure structural integrity.

2.8.6.1. Metal Roof Covering Panel Types and Profiles:

2.8.6.1.1. Trapezoidal Profile Roofing Panels: Panels shall have trapezoidal rib configurations with interlocking ribs for securing adjacent sheets. Joint at interlocking ribs between panels shall be field formed, and shall be as shown on Figure 6.5 of the SMACNA Architectural Sheet Metal Manual referenced herein. Field forming shall be accomplished using an automatic machine specifically designed for that purpose, manual methods such as tongs and pliers will not be permitted. Minor deviations from the joint detailed in the

SMACNA reference may be approved for use at the discretion of the

Contracting Officer provided the joint is a full 360 degree type joint. The joint at interlocking ribs shall have factory installed sealant incorporated in the joint to prevent any capillary seepage of water through the joint. Panels shall be certified by the Metal Roofing System Manufacturer as being capable of being installed on slopes as low as 1/4 inch in 1 foot without exhibiting leakage.

07 61 14 Steel Standing Seam Roofing

Page 15 of 32 Pages

November 2011

2.8.6.1.2. Vertical Leg Profile Roofing Panels: Panels shall have vertical leg rib configurations with interlocking ribs for securing adjacent sheets. Joint at interlocking ribs between panels may be of snap together, or snap and seam configuration, and shall be as shown on items 22. 23. 24. 25. 26. and 27., Figure 3-2 and Figure 3.3 of the SMACNA Architectural Sheet Metal Manual referenced herein. If field forming is required, it shall be accomplished using an automatic machine specifically designed for that purpose, manual methods such as tongs and pliers will not be permitted. Minor deviations from the joint detailed in the SMACNA reference may be approved for use at the discretion of the Contracting Officer provided the minimum slope requirements are met.

The joint at interlocking ribs shall have factory installed sealant incorporated in the joint to prevent any capillary seepage of water through the joint. Panels shall be certified by the Metal Roofing System Manufacturer as being capable of being installed on slopes as low as 1 inch in 1 foot without exhibiting leakage.

2.8.7. WALL PANELS (SIDING): Wall panels shall be fabricated of steel sheet, minimum 26 gauge thickness, structural or corrugated in design and not requiring uniform support. The weathering side of paint-finished wall panels shall match color number 23578 as contained in Federal Standard (Fed-Std) 595C. A manufacturer’s standard color, may be used if, in the opinion of the government, it matches color number 23578. If 23578 is not available as a standard color, the contractor shall supply factory panels painted using the specified paint system in color number 23578 at no additional cost to the government. Color of Galvalume panels shall be as manufactured.

Panels may be lightly embossed to reduce oilcanning.

2.8.7.1. Concealed Fastener Wall Panel (Siding): Concealed fastener wall panel

(siding) shall be corrugated, but shall present a smooth mildly “striated” look when assembled, non-insulated, interlocking panels, which when installed will exhibit the corrugations in a vertical attitude. Wall panels shall be of the concealed fastener type and shall be the roofing membrane manufacturer's standard product. Panels may be lightly embossed to reduce oilcanning.

2.8.8. SOFFIT PANELS: Soffit panels shall be fabricated of steel sheet, minimum 26 gauge thickness, structural or corrugated in design and not requiring uniform support.

Soffit panels shall be corrugated, but shall present a smooth mildly “striated” look when assembled, interlocking panels, as directed. Soffit panels, when installed shall exhibit the striations or joints in a horizontal attitude at ninety degrees to the wall line. Soffit panels shall be of the concealed fastener type and shall be the roofing membrane manufacturer's standard product. Perforated panels shall also be provided and shall be identical to non-perforated soffit panels with the exception that the surface of the panel shall be perforated with an orderly pattern of holes or louvered slots to allow for the passage of air through the panel. Panels may be lightly embossed to reduce oilcanning.

The weathering side of paint-finished soffit panels shall match color number 23578 as contained in Federal Standard (Fed-Std) 595C. A manufacturer’s standard color, may be used if, in the opinion of the government, it matches color number 23578. If 23578 is not available as a standard color, the contractor shall supply factory panels painted

07 61 14 Steel Standing Seam Roofing

Page 16 of 32 Pages

November 2011 using the specified paint system in color number 23578 at no additional cost to the government. Galvalume panels are not contemplated for use.

2.8.9. FLASHINGS AND TRIM: All metal flashings and trim shall be fabricated of 26 gauge minimum thickness steel, Galvalume coated sheet base metal and shall be paint finished on the weathering side in the manufacturer’s standard “Bronze” color most nearly matching color number 20099, as contained in Federal Standard (Fed-Std) 595C or left the natural factory fabricated Galvalume finish as specified for roof covering panel. Federal Standard color 23578 is not contemplated for use in flashings and trim.

2.8.9.1. Ridge Flashing: Ridge flashing assembly shall be the metal roofing system manufacturer's standard product of a configuration to enclose the ridge of the roofing membrane against the weather. Ridge flashing assembly shall prevent intrusion of water when installed on the minimum slope specified for the particular roofing system required. The ridge flashing assembly shall be designed to accommodate movement within the roofing membrane. The ridge flashing assembly shall have provision for the installation of expansion joints in the field if conditions warrant their installation.

2.8.9.2. Rake Fascia: Rake fascia shall be the metal roofing system manufacturer's standard product of a configuration to enclose the rakes of the roofing membrane against the weather.

2.8.9.3. Eave Fascia: Eave fascia shall be the metal roofing system manufacturer's standard product of a configuration to enclose the eaves of the roofing membrane against the weather. Eave fascia shall be designed to be used with or without gutter.

2.8.9.4. Wall to Roof Flashing: Wall to roof flashing shall be the metal roofing system manufacturer's standard product. Where required to accommodate differential movement between new roof and existing wall, wall to roof flashing shall have a flexible insert of EPDM or other suitable material. Wall to roof flashing shall be configured to accommodate both ridge and rake junctures with existing walls. Metal used in wall to roof flashing that is exposed to view shall be finished as specified for other flashing and trim items. EPDM insert shall be the roofing system manufacturer’s standard color.

2.8.9.5. Valley Flashing: Valley flashing shall be the metal roofing system manufacturer's standard product of a configuration to enclose valleys in the roofing membrane against the weather. Valley flashing shall prevent intrusion of water when installed on the minimum slope specified for the particular roofing system required.

2.8.9.6. Hip Flashing: Hip flashing shall be the metal roofing system manufacturer's standard product of a configuration to enclose hips in the roofing membrane against the weather. Hip flashing shall prevent intrusion of water when installed on the minimum slope specified for the particular roofing system required.

2.8.9.7. Custom Flashing: Custom rake, eave, hip, valley, and miscellaneous flashing shall be provided when the manufacturer's standard flashing configuration

07 61 14 Steel Standing Seam Roofing

Page 17 of 32 Pages

November 2011 is not adaptable to field conditions or when otherwise required by the Government.

Metal used in custom flashing shall be finished as specified for other flashing and trim items.

2.8.10. GUTTER AND DOWNSPOUTS: All metal gutter and downspouts trim shall be fabricated of 26 gauge minimum thickness steel. Gutter hangars shall be fabricated of heavy gauge steel well suited to their intended purpose. Gutter, gutter hangar, downspout, and downspout hangar brackets finish shall be Galvalume coated base metal and shall be paint finished on the weathering side in the manufacturer’s standard

“Bronze” color most nearly matching color number 20099, as contained in Federal

Standard (Fed-Std) 595C or left the natural factory fabricated Galvalume finish as specified for roof covering panel. Federal Standard color 23578 is not contemplated for use in gutter, downspout or gutter hangars.

2.8.10.1. Gutter: Gutter shall be sized and fabricated in accordance with guidelines of “Design of Roof Drainage System” as presented in Chapter 1 of Sheet

Metal and Air Conditioning Contractors National Association, Inc. (SMACNA), Architectural Sheet Metal Manual, Sixth Ed., 2003 or most current edition. Gutter sizing calculations shall be provided with each delivery order. During sizing of gutter, bear in mind, location and cross section area of downspouts. Finish of gutter to match adjacent material or as directed.

2.8.10.2. Downspout: Downspout may be round or rectangular in cross section.

Downspout shall be securely fastened to the building walls using an approved steel hanger bracket spaced sufficiently to ensure adequate strength. Downspout shall be sized and fabricated in accordance with guidelines of “Design of Roof Drainage

System” as presented in Chapter 1 of Sheet Metal and Air Conditioning

Contractors National Association, Inc. (SMACNA), Architectural Sheet Metal

Manual, Sixth Ed., 2003 or most current edition. Downspout sizing calculations shall be provided with each delivery order. During sizing of downspout, bear in mind, the cross sectional area of gutters. Finish of gutter to match adjacent material or as directed.

2.8.11. MISCELLANEOUS MATERIALS:

2.8.11.1. Rooftop Equipment Curbs: Rooftop equipment curbs shall be pre-fabricated of heavy steel or aluminum stock and shall have all corners and seams welded. Curbs shall have flanges constructed to match the configuration of the metal roofing panel ribs, and may be of either seam-in or fasten on variety. Curbs that span more than two roofing panel ribs shall be equipped with water diverters such that water will not stand against the curb between the ribs. Curbs shall be fabricated such that when installed on the roof, the curb top shall be horizontal and the equipment level. Curbs shall be painted with enamel or other approved exterior type finish to match the roofing panel in color. Primers and undercoats shall be applied where appropriate.

2.8.11.2. Flexible Vent Pipe Flashing: Flexible vent pipe flashing shall be the metal roofing system manufacturer's standard product of a configuration to seal

07 61 14 Steel Standing Seam Roofing

Page 18 of 32 Pages

November 2011 around circular vent pipe penetrations and prevent intrusion of water through the metal roofing membrane. Flexible vent pipe flashing shall consist of a flexible ring of EPDM or other suitable material bonded to a malleable steel draw-ring which when fastened to the roofing membrane will weatherproof the penetration.

Exposed portions of the flashing system shall be finished to match the roofing panel in color.

2.8.11.3. Gable Vents: Gable vent louvers shall be fabricated of prefinished aluminum, prefinished zinc-coated steel, or prefinished aluminum-zinc alloy coated steel and shall be furnished with bird screens. Minimum thickness shall be: Steel -

0.023 inch, Aluminum - 0.032 inch. If not fabricated of the manufacturer's standard prefinished KYNAR painted stock, gable vents shall be painted with enamel or other approved exterior type finish to match the roofing panel in color.

Primers and undercoats shall be applied where appropriate.

2.8.11.4. Continuous Ridge Ventilators:

2.8.11.4.1. Operable Continuous Ridge Ventilators: Not Used.

2.8.11.4.2. Fixed Low Profile Continuous Ridge Ventilators: Fixed low profile continuous ridge ventilators shall be fabricated of aluminum, zinc-coated steel, or aluminum-zinc alloy coated steel and shall be furnished with bird screens or other effective means to exclude birds. Fixed low profile ridge vents shall fit closely to the ridge when installed and have a pleasing, inconspicuous look when installed. Fixed low profile ridge vents shall have fibrous fill or other means for preventing entry of insects or birds. Ventilators shall have a 3-5 inch throat and be furnished in 8- to 10-foot long sections braced at mid-length. Ventilators shall be fabricated specifically for the slope of the roof where they are intended such that the fastening flanges fit securely against the roofing membrane. Minimum thickness shall be: Steel - 0.023 inch, Aluminum - 0.032 inch. Continuous ridge ventilators shall be finished to match the roofing panels in color. If not factory pre-finished, continuous ridge ventilators shall be painted with enamel or other approved exterior type finish to match the roofing panel in color. Primers and undercoats shall be applied where appropriate.

2.8.11.5. Faced Insulation

2.8.11.5.1. Faced Blanket Insulation: Insulation shall be a blanket type insulation of sufficient thickness to provide a minimum "R" value of 6 when tested in accordance with ASTM C 177 through the insulation blanket.

Insulation shall have a facing providing a permeability of 0.02 perm or less when tested in accordance with ASTM E 96. Facing shall have a flame spread rating of less than 25 when tested in accordance with ASTM C 84. Blanket insulation shall conform to ASTM C 665, Type II, Class A or Type III, Class

A. Typically, blanket insulation will be installed between roof panel or wall panel and retro-fit structure.

07 61 14 Steel Standing Seam Roofing

Page 19 of 32 Pages

November 2011

2.8.11.5.2. Faced Batt Insulation: Faced batt insulation shall be a foil faced, batt type fibrous glass insulation of sufficient thickness to provide a minimum

"R" value of 19 when tested in accordance with ASTM C 518 through the insulation batt. Insulation shall have a facing providing a permeability of 0.05 perm or less when tested in accordance with ASTM E 96. Facing shall have a flame spread rating of less than 25 when tested in accordance with ASTM E

84. Batt insulation shall be foil faced and shall conform to ASTM C 665, Type

III, Class A. Insulation shall be sized as…