SECTION 07611

CUSTOM SHEET METAL ROOFING

PART	GENERAL

SECTION INCLUDES

[Copper] [[Precoated] Galvanized steel] [Terne-coated [stainless] steel] [Aluminum] [Stainless steel] [________] roofing, associated integral flashings, and underlayment.

[Counterflashings.]

[Integral gutters [and downspouts].]

[Snow guards.]

[Integral fascias.]

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section [______-____________]: Placement of attachment anchors.

Section [______-____________]: Placement of counterflashings.

Section [______-____________]: Placement of flashing reglets and accessories.

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

Section [______-____________]: Special attachment anchors for securing [________].

RELATED SECTIONS

[Section [______-____________]: Precast concrete splash pads at downspout outlets.]

Section [______-____________]: Roof deck construction with [sheathing] [________] surface.

Section 06112 - Framing and Sheathing: Plywood roof deck substrate.

Section 06114 - Wood Blocking and Curbing: Wood blocking and battens for metal roofing substrate profiles.

Section 07212 - Board Insulation: Rigid insulation under sheet metal roofing system.

Section [______-____________]: Membrane roofing substrate.

Section 07620 - Sheet Metal Flashing and Trim.

Section 07631 - Gutter and Downspouts.

Section 07724 - Roof Hatches.

Section [07810 - Plastic Unit Skylights.] [Metal Framed Skylights.]

Section 07900 - Joint Sealers.

Section 09900 - Painting: [Prime and] finish painting.

Section [______-____________]: Connection of downspouts to [storm sewer.] [________.]

Section [______-____________]: Roof curbs for mechanical equipment.

Section [______-____________]: Roof curbs for electrical equipment.

REFERENCES

AA (Aluminum Association) - Aluminum Construction Manual: Aluminum Sheet Metal Work in Building Construction.

AISI (American Iron and Steel Institute) - Stainless Steel - Uses in Architecture.

ASTM A167 - Stainless and Heat-Resisting Chromium-Nickel Steel Plate.

ASTM A361 - Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process for Roofing and Siding.

ASTM A446 - Steel Sheet, Zinc Coated, (Galvanized) by the Hot-Dip Process, Structural (Physical) Quality.

ASTM B32 - Solder Metal.

ASTM B101 - Lead-Coated Copper Sheet.

ASTM B209 - Aluminum and Alloy Sheet and Plate.

ASTM B370 - Copper Sheet and Strip for Building Construction.

ASTM B486 - Paste Solder.

ASTM D226 - Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing.

ASTM D2178 - Asphalt Impregnated Glass Mat for Roofing and Waterproofing.

ASTM D4586 - Asphalt Roof Cement, Asbestos-Free.

CDA (Copper Development Association) - Contemporary Copper, A Handbook of Sheet Copper Fundamentals, Design, Details and Specifications.

CDA - Copper Roofing - A Practical Handbook.

FS L-P-512 - Polyethylene Underlayment.

FS O-F-506 - Flux, Soldering, Paste and Liquid.

NRCA (National Roofing Contractors Association) - Roofing Manual.

SMACNA - Architectural Sheet Metal Manual.

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Shop Drawings: Indicate material profile, jointing pattern, jointing details, fastening methods, flashings, terminations, and installation details.

Product Data: Provide data on metal types, finishes, characteristics, and [________].

Submit specified trade association installation instructions.

Submit [two] [____] samples [____x____] inch ([____x____] mm) in size illustrating metal roofing mounted on plywood backing illustrating typical [[flat] [batten] [standing] seam], [external corner,] [internal corner,] [valley,] [ridge,] [junction to vertical dissimilar surface,] [________], material, and finish.

Submit [two] [____] samples [____x____] inch ([____x____] mm) in size illustrating metal finish color.

QUALITY ASSURANCE

Perform work in accordance with [AA] [AISI] [CDA] [SMACNA] [NRCA] [________] standard details and requirements.

Maintain [one copy] [[____] copies] of [each] document on site.

QUALIFICATIONS

Fabricator and Installer: Company specializing in sheet metal roof installations with minimum [____] years [documented] experience.

MOCKUP

Provide mockup of sheet metal roofing system under provisions of Section [01400.] [________.]

Construct [________] mockup, [____] feet ([____] m) long by [____] feet ([____] m) wide, which includes associated attachments, flashings, joints and junctions, control or expansion joints, terminating items, [ice dam protection,] and [________].

Locate [where directed.] [________.]

Mockup may [not] remain as part of the Work.

PRE-INSTALLATION CONFERENCE

Convene [one] [_____] week prior to commencing work of this section, under provisions of Section [01039.] [________.]

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products to site under provisions of Section [01600.] [________.]

Stack preformed [and prefinished] material to prevent twisting, bending, or abrasion, and to provide ventilation. Slope metal sheets to ensure drainage.

Prevent contact with materials which may cause discoloration or staining.

COORDINATION

Coordinate work under provisions of Section [01039.] [________.]

Coordinate with the work of Section [________] for installing flashing reglets and Section [________] for [________].

WARRANTY

Provide [two] [____] year warranty under provisions of Section [01700.] [________.]

Warranty: Include coverage for [degradation of metal finish] [water tightness] [integrity of seals] [________].

PART	PRODUCTS

FABRICATORS

[__________________________________].

[__________________________________].

[__________________________________].

Substitutions: Under provisions of Section [01600.] [________.]

SHEET MATERIALS

Copper: ASTM B370, cold rolled [[20] [24] [____] oz/sq ft] [[0.027] [0.032] [____] inch ([0.7] [0.8] [____] mm) thick]; [natural] [lacquered] finish.

****** [OR] ******

Pre-Coated Galvanized Steel: ASTM A446, Grade A, [G90] [____] zinc coating; [24] [____] gage ([0.6] [____] mm) core steel, shop pre-coated with [modified silicone] [PVDF] [________] coating of [________] color [as selected.] [to match [________.]

****** [OR] ******

Galvanized Steel: ASTM A361, [G90] [____] zinc coating; [24] [26] [____] gage ([0.6] [0.5] [____] mm) core steel.

****** [OR] ******

Terne Coated Steel: [____] inch ([____] mm) [copper bearing carbon steel] [stainless steel conforming to ASTM A167, Type [304] [____]; core material with [0.015] [____] inch ([0.4] [____] mm) terne alloy coating on both sides of core metal.

****** [OR] ******

Lead Coated Copper: [ASTM B101 Type 1, Class A, soft temper, [____] oz/sq ft ([____] gm/sq m).] [________.]

****** [OR] ******

Aluminum Sheet: ASTM B209, [____] alloy, [____] temper; [____] inch ([____] mm) thick; [mill] [plain] [stucco embossed] finish [, shop pre-coated with [________] coating of [________] color [as selected] [to match [________] finish].

****** [OR] ******

Stainless Steel: ASTM A167, Type [304] [____], soft temper, [____] inch ([____] mm) thick; [smooth] [[________] patterned] [4D] [________] finish.

ACCESSORIES

Fasteners: [Galvanized steel] [Aluminum] [Stainless steel] [Copper] [Same material and finish as flashing metal] [, with soft neoprene washers].

Underlayment: [ASTM [D226] [D2178], No. [15] [____] asphalt saturated roofing felt.] [FS L-P-512, 6 mil (0.15 mm) polyethylene.] [________.]

Slip Sheet: [Rosin sized building paper.] [________.]

Primer: [Zinc chromate] [Galvanized iron] [Iron oxide linseed oil] [________] type.

Protective Backing Paint: [Zinc chromate alkyd.] [Bituminous.] [________.]

Sealant: [Acrylic] [Polyurethane] [________] type, [specified in Section [07900] [________].] [[________] manufactured by [____________].]

Bedding Compound: [Rubber-asphalt] [Butyl] [________] type, [________] manufactured by [____________].

Plastic Cement: ASTM D4586, Type [I.] [II.]

Eave (Ice Dam) Protection: Sheet barrier of rubberized asphalt bonded to sheet polyethylene, [40] [____] mil ([1] [____] mm) total thickness, with strippable treated release paper; [________] manufactured by [________________].

****** [OR] ******

Eave (Ice Dam) Protection: ASTM D226, No. [15] [20] [30], [unperforated] [perforated] asphalt saturated felts.

****** [OR] ******

Eave (Ice Dam) Protection: ASTM D2178, Type IV, glass fiber felts.

Reglets: [Surface mounted] [Recessed] type, [galvanized steel] [rigid extruded PVC] [________]; [face and ends covered with plastic tape;] [________] manufactured by [____________].

Solder: ASTM B32; [50/50] [____] type.

****** [OR] ******

Paste Solder: ASTM B486; [____] type.

Flux: [FS O-F-506.] [________.]

SHOP FABRICATION

Form sections true to shape, accurate in size, square, and free from distortion or defects.

Fabricate cleats of [[________] type sheet metal,] [same material as sheet,] minimum [____] inches ([____] mm) wide, interlockable with sheet.

Fabricate starter strips of [[________] type sheet metal,] [same material as sheet,] [continuous] [intermittent to minimum [____] inches ([____] mm) wide], interlockable with sheet.

Form pieces [in longest practical lengths.] [in single length sheets.]

Hem exposed edges on underside [1/2] [____] inch ([13] [____] mm); miter and seam corners.

Form material with [standing] [batten] [flat lock] seams.

Pretin edges of [copper] [________] sheet. Solder shop formed metal joints. After soldering, remove flux. Wipe and wash solder joints clean. Weather seal joints.

Fabricate corners from one piece with minimum [18] [____] inch ([450] [____] mm) long legs; [seam] [solder] for rigidity, seal with sealant.

Fabricate vertical faces with bottom edge formed outward 1/4 inch (6 mm) and hemmed to form drip.

Fabricate flashings to allow toe to extend [2] [____] inches ([50] [____] mm) over roofing [gravel] [paver] [________]. Return and brake edges.

Form sheet metal pans (pitch pockets) [6] [____] inch ([150] [____] mm) nominal size, with [3] [____] inch ([75] [____] mm) upstand, and 4 inch (100 mm) flanges.

Fabricate snow guards [in accordance with SMACNA Plate 159.] [as detailed.]

FINISH

[Prepare [copper] [________] surfaces in accordance with Section [09900] [________].]

Back paint concealed metal surfaces with protective backing paint to a minimum dry film thickness of [15] [____] mil ([0.4] [____] mm).

PART	EXECUTION

EXAMINATION

Inspect roof deck to verify deck is clean and smooth, free of depressions, waves, or projections, properly sloped to [drains] [valley] [or] [eaves].

Verify deck is dry and free of snow or ice. [Verify joints in wood deck are solidly supported and fastened.]

Verify correct placement of wood nailers [and insulation positioning between nailers].

Verify roof openings, curbs, pipes, sleeves, ducts, or vents through roof are solidly set, reglets are in place, and nailing strips located.

Verify roofing termination and base flashings are in place, sealed, and secure.

PREPARATION

Install starter and edge strips, and cleats before starting installation.

[Install surface mounted reglets true to lines and levels. Seal top of reglets with sealant.]

INSTALLATION - EAVE (ICE DAM) PROTECTION

Place [eave edge] [and] [gable edge] metal flashings tight with facia boards. Weather lap joints [2] [____] inches ([50] [____] mm) and seal with plastic cement. Secure flange with nails spaced [____] inches ([____] mm) oc.

Apply rubberized asphalt/polyethylene sheet eave protection in accordance with manufacturer's instructions.

****** [OR] ******

Apply 4 inch (100 mm) wide band of plastic cement over deck flange of eave edge flashings, and embed an [18] [____] inch ([450] [____] mm) wide strip of underlayment. Place underlayment starter strip with eave edge flush with face of flashings. Secure in place. Lap ends minimum [6] [____] inches ([150] [____] mm).

Apply lap cement at rate of approximately [1 1/4] [____] gal/100 sq ft ([0.5] [____] L/sq m) over underlayment starter strip.

Starting from lower edge of starter strip, lay additional 36 inch (900 mm) wide strips of underlayment in lap cement, to produce a [two] [____] ply membrane. Weather lap plies minimum [19] [____] inches ([475] [____] mm) and nail in place. Lap ends minimum [6] [____] inches ([150] [____] mm). Stagger end joints of each consecutive ply.

Extend eave protection membrane minimum [4] [2] [____] feet ([1 200] [600] [____] mm) upslope beyond interior face of exterior wall.

INSTALLATION

Conform to drawing details [____] [____] [____] included in the [AA] [AISI] [CDA] [SMACNA] [NRCA] manual.

Apply underlayment [in single layer laid perpendicular to slope; weather lap edges 2 inches (50 mm) and nail in place.] [in 2 layers; the first layer laid parallel to slope with joints lapped 6 inches (150 mm), second layer laid perpendicular to slope with 2 inch (50 mm) lapped edges.] Minimize nail quantity.

[Apply slip sheet in one layer, laid loose.]

Cleat and seam all joints.

Use bedding compound for joints between metal and bitumen or metal and felts.

[Stagger] [Align] transverse joints of roofing sheets.

Provide [formed] [________] metal pans for protrusions through roof. Fill pans watertight with plastic cement.

Provide [integral gutters] [downspouts] [fascias] [metal splash pans] [and] [________].

Back paint surfaces in contact with dissimilar materials.

Solder [lap] [intersection] [________] joints. After soldering, wash metal clean with neutralizing solution, rinse with water.

FLAT SEAM ROOFING

Conform to [SMACNA details, Plate 84.] [________.]

****** [OR] ******

Space seams at [____] inch ([____] mm) oc.

Notch corners and turn up [pretinned] edges [3/4] [____] inch ([19] [____] mm).

Lay sheets with long dimension [parallel] [perpendicular] to eaves. Apply pans beginning at eaves.

Lock cleats into seams and flatten [in direction of drainage].

At eaves and gable ends, terminate roofing by hooking over edge strip.

Fold lower ends of seams at eaves over at 45 degree angle.

Form valleys of sheets not exceeding 10 feet (3 m) in length. Lap joints [6] [____] inches ([150] [____] mm) in direction of drainage.

Extend valley sheet minimum [6] [____] inches ([150] [____] mm) under roofing sheets.

At valley, fold valley and roofing sheets and secure with cleats spaced [18] [____] inches ([400] [____] mm) oc.

****** [OR] ******

STANDING SEAM ROOFING

Conform to [SMACNA details, Plates 85, 86, and 87.] [________.]

****** [OR] ******

Space standing seams at [____] inch ([____] mm) oc.

Lay sheets with long dimension perpendicular to eaves. Apply pans beginning at eaves.

Lock cleats into seams [and flatten].

At eaves and gable ends, terminate roofing by hooking over edge strip.

Finish standing seams [1] [____] inch ([25] [____] mm) high on flat surfaces [and 1/2 inch (13 mm) high on curved surfaces].

Bend up one side edge [1-1/2] [____] inches ([38] [____] mm) and other edge [1-3/4] [____] inches ([44] [____] mm).

Make first fold [1/4] [____] inch ([6] [____] mm) wide single fold and second fold [1/2] [____] inch ([13] [____] mm) wide, providing locked portion of standing seam, [5] [____] plies in thickness.

Fold lower ends of seams at eaves over at 45 degree angle.

Terminate standing seams at ridge and hips by turning down with tapered fold.

Form valleys of sheets not exceeding [10] [____] feet ([3] [____] m) in length. Lap joints [6] [____] inches ([150] [____] mm) in direction of drainage.

Extend valley sheet minimum [6] [____] inches ([150] [____] mm) under roofing sheets.

At valley, double fold valley and roofing sheets and secure with cleats spaced [18] [____] inches ([400] [____] mm) oc.

****** [OR] ******

BATTEN SEAM ROOFING

Conform to [SMACNA details, Plates 88, 89, and 90.] [________.]

****** [OR] ******

Space battens [____] inches ([____] mm) oc.

Turn up sides of sheets and extend [1/2] [____] inch ([13] [____] mm) above top of battens.

Form cross seams with [3/4] [____] inch ([19] [____] mm) fold under on lower end and [2] [____] inches ([50] [____] mm) fold on upper end. Slit folds in cross seams at each corner, [1] [____] inch ([25] [____] mm) in from batten to form tab. Hook fold on lower end of pan into fold on upper end of underlaying pan.

Apply pans beginning at eaves.

Place cover strips over battens, locking edges with flanges of pan malleted down against sides of battens. Cover batten ends with cap folded and locked into extensions of batten covers and vertical legs of pans.

At intersection of roof slope with ridge and hip battens, turn up edges of roof pans against battens and terminate in [1/2] [____] inch ([13] [____] mm) flange at top of battens. Install cover strips.

Form valleys of sheets not exceeding [10] [____] feet ([3] [____] m) in length. Lap joints [6] [____] inches ([150] [____] mm) in direction of drainage.

Extend valley sheet minimum [6] [____] inches ([150] [____] mm) under roofing sheets.

At valley, double fold valley and roofing sheets and secure with cleats spaced [18] [____] inches ([400] [____] mm) oc.

At eaves without gutters, hook pan over edge strip. Extend edge strip up under metal roofing [4] [____] inches ([100] [____] mm) and secure with nails at [4] [____] inches ([100] [____] mm) oc, at [1] [____] inch ([25] [____] mm) from upper end.

****** [OR] ******

At eaves with gutters, loose lock end of roofing pans into gutters.

Install batten flush with gable. Extend batten cover down exterior face and lock into edge strip.

BUILT-IN GUTTERS

Conform to [SMACNA details, Plates 4, 9, 10, and 22.] [________.]

****** [OR] ******

Secure gutter lining to substrate with cleats spaced minimum [____] inches ([____] mm) oc along edges of gutters.

Longitudinal joints not acceptable.

At roof edges, extend gutter lining under metal roofing [6] [____] inches ([150] [____] mm) minimum and terminate in [3/4] [____] inch ([19] [____] mm) folded edge secured by cleats. Hook lower end of roofing into lock strip to form [3/4] [____] inch ([19] [____] mm) wide loose-lock seam.

[Seal] [Solder] gutters watertight. [Seal] [Solder] joint of gutter to [drain] [scupper] [________] [with [________] sealant.]

FLASHINGS

Conform to [SMACNA details, Plates [54.] [____.]

****** [OR] ******

Insert flashings into reglets to form tight fit. Secure in place with [lead] [plastic] wedges at maximum [____] inches ([____] mm) on center. [Pack remaining spaces with lead wool.] [Seal flashings into reglets with sealant.]

Secure flashings in place using concealed fasteners. [Use exposed fasteners only where permitted.]

Cleat and seam all joints.

Apply plastic cement compound between metal flashings and felt flashings.

Fit flashings tight in place. Make corners square, surfaces true and straight in planes, and lines accurate to profiles.

[Install snow guards [____] inch ([____] mm) up slope from eaves [and valleys].]

Seal metal joints watertight.

****** [OR] ******

Solder metal joints for full metal surface contact. After soldering, wash metal clean with neutralizing solution and rinse with water.

FIELD QUALITY CONTROL

Field inspection will be performed under provisions of Section [01400.] [________.]

PROTECTION OF FINISHED WORK

Protect finished Work under provisions of Section [01500.] [________.]

Do not permit traffic over unprotected roof surface.

END OF SECTION