Specification:Copper sheet metal flashing

__NUMBEREDHEADINGS__

=GENERAL=

SYSTEM DESCRIPTION
Perform sheet metalwork to accomplish weather tight construction.Install the work without waves, warps, buckles, fastening stresses or distortion, allowing for expansion and contraction. Cutting, fitting,drilling, and other operations in connection with sheet metal required to accommodate the work of other trades shall be performed by sheet metal mechanics. Exposed edges shall be hemmed. Bottom edges of exposed vertical surfaces shall be angled to form drips. Form flashing into a 3-dimensional configuration, at the end of a run. to direct water to the outside of the system. Weights and thicknesses of copper flashing shall be as specified in TABLE 1. Install joints as specified in TABLE 2. Provide accessories and other items, essential to complete the sheet metal installation, though not specifically indicated or specified. Installation of sheet metal items used in conjunction with roofing shall be coordinated with roofing work to permit continuous roofing operations. Factory-fabricated components shall be packed in cartons marked with the manufacturer's name or trademark printed or embossed at frequent intervals to permit easy identification. Sheet metalwork pertaining to heating, ventilating, and air conditioning is specified in other sections.

Galvanic action between copper and iron or steel shall be avoided bythe use of proper insulation. The copper shall be insulated by thefollowing: covering the steel member with insulation; placing strips ofsheet lead between the two metals; or by heavily tinning the iron. 

SUBMITTALS
Government approval is required for submittals with a "G" designation;submittals not having a "G" designation are for [Contractor Quality Control approval.] [information only. When used, a designation following the "G"designation identifies the office that will review the submittal for the Government.] Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:
 * SD-02 Shop Drawings
 * Sheet Metal
 * D-03 Product Data
 * Contractor Quality Control
 * SD-04 Samples
 * Materials

DELIVERY, STORAGE, AND HANDLING
Materials shall be adequately packaged and protected during shipment and inspected for damage, dampness, and wet-storage stains upon delivery to the jobsite. Materials shall be clearly labeled as to type and manufacturer.Sheet metal items shall be carefully handled to avoid damage. Store materials in dry, weather tight, ventilated areas until installation. =PRODUCTS=

MATERIALS
Provide materials conforming to the requirements specified below, and those given in TABLE 1. Materials exposed to weather shall be copper.Recyclable materials (building paper, etc.) shall conform to EPA requirements in conformance with Section 01 62 35 RECYCLED / RECOVERED MATERIALS. Submit samples of materials proposed for use, upon request.

Bituminous Cement
ASTM D2822/D2822M, Type I.

Fasteners
Fasteners shall conform to TABLE 1. Nails shall conform to ASTM F547 or beas approved. Nails and rivets shall be copper. Screws and bolts shall bebronze. Fasteners shall be the best type for the application.

Felt
ASTM D226/D226M, Type II.

Flux
CID A-A-51145, Type I.

Slip Sheet
Building paper meeting the requirements of ASTM C1136, Type IV, styleoptional.

Sheet Metal
Sheet metal shall conform to ASTM B152/B152M, ASTM B370, Light cold-rolledtemper (H00) copper. Submit drawings showing weights, gauges, or thicknessof sheet metal; type of material; joining, expansion-joint spacing, andfabrication details; and installation procedures. Materials shall not bedelivered to the site until after the approved detail drawings have beenreturned to the Contractor.

Solder
ASTM B32 Sn50.

SEALANTS AND SEALING COMPOUNDS
Sealants and sealing compounds are specified in Section 07 92 00 JOINTSEALANTS. =PART 3 EXECUTION=

EXISTING COPPER SHEET METAL
Existing, original, historic copper sheet metal elements that are intactand serviceable shall be salvaged and reused whenever possible. This mayinclude, but is not limited to, gutters, hangers, downspouts, connectors,leader heads, leader straps, basket strainers, splash pans, and otherarchitectural sheet metal elements such as finials, and decorative panels.When work involves repair and replacement of copper sheet metal elements,new elements shall match existing original elements as closely as possible.

Soldering
Edges of sheet metals, except lead coated material, shall be pretinnedbefore soldering is begun. Soldering shall be done slowly with well heatedsoldering irons to thoroughly heat the seams and completely sweat thesolder through the full width of the seam. Edges of lead coated materialto be soldered shall be scraped or wire-brushed to produce a brightsurface, and seams shall have a liberal amount of flux brushed in beforesoldering is begun. Soldering shall follow immediately after applicationof the flux. Upon completion of soldering, the acid flux residue shall bethoroughly cleaned from the sheet metal with a solution of washing soda inwater and rinsed with clean water.

Seams
Flat-lock and soldered-lap seams shall finish not less than 25 mm 1 inch wide. Unsoldered plain-lap seams shall lap not less than 75 mm 3 inches unless otherwise specified. Flat seams shall be made in the direction ofthe flow.

COVERING ON MINOR FLAT, PITCHED, OR CURVED SURFACES
Unless otherwise indicated, minor flat, pitched, or curved surfaces, suchas crickets, bulkheads, dormers, and small decks, shall be covered orflashed with 450 x 600 mm 18 x 24 inch metal sheets and shall be securedwith cleats. One ply of felt covered with 1 ply of slip sheet shall beapplied as underlayment on wood surfaces. Two cleats shall be placed onthe long side and 1 cleat shall be placed on the short side. Seams shallbe locked and soldered.

CLEATS
Provide a continuous cleat where indicated or specified to secure loose edges of the sheet metalwork. Space butt joints approximately 3 mm 1/8 inch apart. Fasten the cleat to the supporting construction with nails evenly spaced not over 300 mm 12 inches on centers. Where the fastening is to be made to concrete or masonry, use screws driven in expansion shields set in concrete or masonry. The cleat for fascia anchorage shall be installed to extend below the supporting construction to form a drip and to allow the flashing to be hooked over the lower edge at least 19 mm 3/4 inch. The cleat shall be of sufficient width to provide adequate bearing area to ensure a rigid installation. Where horizontal nailer is vented for insulation and the cleat is placed over masonry or concrete, the cleat shall be installed over 1.6 mm 1/16 inch thick metal washers placed at screws. Washers shall be of metal that is electrolytically compatible with the continuous cleat.

EXPANSION JOINTS
Provide expansion joints at 12.0 meter 40 foot intervals, except that wherethe distance between the last expansion joint and the end of the continuousrun is more than half the required interval spacing, an additional jointshall be provided. Joints shall be evenly spaced.

General
Install flashings at intersections of roof with vertical surfaces and at projections through roof, except that flashing for heating and plumbing,including piping, roof, and floor drains, and for electrical conduit projections through roof or walls is covered in appropriate sections for such work. Cap flashings shall be turned around exterior corners of masonry or concrete walls at least 50 mm 2 inches, shall be secured into masonry joints and into concrete with expansion anchors and shall be sealed with No. 2 or 4 sealing compound. Corner units shall have mitered joints,shall be installed with 75 mm 3 inch lap joint over flashings on each side. Unless otherwise indicated, through-wall flashing shall be terminated 13 mm 1/2 inch inside each exposed face of the wall. Cap flashings shall be provided over base flashings. Perforations in flashings made by masonry anchors shall be covered up by an application of bituminous plastic cement at the perforation. Exposed and unfastened flashings shall have the edge of the strip turned under 13 mm 1/2 inch. Flashing shall be installed on top of joint reinforcement.

Base Flashings
Base flashings shall extend under the uppermost row of tile the full depth of the tile or at least 100 mm 4 inches over the tile immediately below the metal. The vertical leg of the metal shall be turned up not less than 100 mm 4 inches and preferably 200 mm 8 inches on the abutting surface. Where a vertical surface butts against the roof slope, the base flashing shall be built into each course of tile as it is laid, turning the metal out 100 mm 4 inches on the tile and at least 200 mm 8 inches above the roof. Where the roof stops against a stuccoed wall, a wood 2 x 4 with a beveled top edge shall be secured to the wall. The base flashing shall then be turned out over the tile at least 100 mm 4 inches and bent up vertically at least 75 mm 3 inches on the board. The base flashing shall be turned out 100 mm 4 inches on the roof surface and from 150 to 200 mm 6 to 8 inches on the vertical surface for either sloping or flat slate roofs. Base flashings shall be used where posts, flagpoles, or scuttles project through the roof. Vent pipes shall have base flashings in the form of special sleeves and/or EPDM boots.</li> </ol>

Cap Flashings (Counterflashings)
Where the base flashing is not covered by vertical tile or siding, a capflashing shall be built into the masonry joints lapping not less than 50 mm 2 inches vertically, extending down over the base flashing 100 mm 4 inches,and the edge bent back and up 13 mm 1/2 inch.

Stepped Flashing
Stepped flashing shall be installed where sloping roofs surfaced with tiles abut vertical surfaces. Separate pieces of base flashing shall be placed in alternate tile courses. Each piece of base flashing shall extend out onto the roof at least 100 mm 4 inches and shall be nailed to the deck.The stepped base flashing shall extend up along the wall not less than 100mm 4 inches and stop beneath the cap flashing or shall be anchored beneath wood siding in frame construction. Cap flashings shall be set in a reglet into masonry and concrete construction, and cap flashing shall lap over the flashing below not less than 75 mm 3 inches. The stepped base flashing at vertical joints between the sections shall be lapped not less than 75 mm 3 inches.

Valley Flashing
Valley flashing shall be free from longitudinal seams and shall be of a width sufficient to extend not less than 150 mm 6 inches under the roof covering on each side. The sheets shall lap not less than 200 mm 8 inches in the direction of flow and shall be secured to roofing construction with cleats on each side. Cleats shall be spaced not more than 600 mm 24 inches on centers. The copper sheet shall not be punctured with nails at anyplace.

Open Valley Flashings
Open valleys shall be not less than 100 mm 4 inches wide. The proper width shall be determined by the following rule: Starting at the top with a width of 100 mm 4 inches, increase the width 25 mm 1 inch for every 2.4 meters 8 feet of length of the valley. Flashing pieces shall be full length sheets and of sufficient width to cover the open portion of the valley and extend up under the roofing not less than 150 mm 6inch on each side.</li> Where two valleys of unequal size come together; where the areas drained by the valley are unequal; where the slope of the valley is 26 degrees or less (500 mm per meter or less 6 inches or less per foot;)or where the intersecting roofs are of different slopes, an inverted V-joint 25 mm 1 inch high, shall be provided along the center line of the valley, and the edge of the valley sheets shall extend 200 mm 8 inches under the roof covering on each side.</li> </ol>

Closed Valleys
Flashing pieces for closed valleys shall be of sufficient length to extend 50 mm 2 inches above the top of the roofing piece and lap the flashing piece below 75 mm 3 inches, and of sufficient width to extend up the sides of the valley far enough to make the valley 200 mm 8 inches deep.</li> Flashing shall be placed with the roofing so that all pieces are separated by a course of tile. Pieces shall be set so as to lap at least 75 mm 3 inches and to be entirely concealed by the tiles.Flashing shall be fastened by nails at the top edge only.</li> </ol>

Through-Wall Flashing
Through-wall flashing includes sill, lintel, and spandrel flashing. The flashing shall be laid with a layer of mortar above and below the flashing so that the total thickness of the two layers of the mortar and flashing are the same thickness as the regular mortar joints. Flashing shall be one piece for lintels and sills.

Lintel Flashing
Lintel flashing shall extend the full length of lintel. It shall extend through the wall one masonry course above the lintels and shall be bent down over the top of masonry and precast concrete lintels. Bed joints of lintels at control joints shall be underlaid with sheet metal bond breaker.

Sill Flashing
Sill flashing shall extend the full width of the sill and not less than 100mm 4 inches beyond ends of sill except at a control joint where the flashing shall be terminated at the end of the sill.

Eave and Rake Flashings
Eave and rake flashings shall be placed in accordance with SMACNA 1793.

REGLETS
Reglets shall be a factory fabricated product, complete with fittings and special shapes as may be required. Open-type reglets shall be filled with fiberboard or other suitable separator to prevent crushing of the slot during installation. Reglets shall be located not less than 200 mm 8 inches nor more than 400 mm 16 inches above roofing not having cant strips or shall be located not less than 125 mm 5 inches nor more than 325 mm 13 inches above cant strip. Reglet plugs shall be spaced not over 300 mm 12 inches on centers and reglet grooves shall be filled with sealant.Friction or slot-type reglets shall have metal flashings inserted the full depth of slot and shall be lightly punched every 300 mm 12 inches to crimp the reglet and cap flashing together.

GRAVEL STOPS AND FASCIA
Fabricate sheets without longitudinal joints except where 2-piece fasciae are used when fascia depth exceeds 175 mm 7 inches. Provide provision forexpansion at joints. Factory fabricated internal and external corner units with mitered joints shall be provided. Roof flange and splice plate of thegravel stop and fascia shall extend out on the roof not less than 100 mm 4 inches, and shall be set in bituminous cement over the roofing felt. Roof flange shall be secured with nails spaced not greater than 75 mm 3 inches on centers located within 25 mm 1 inch of the outer edge of the flange.The fascia section shall not be face nailed except as specified for 2-piecefasciae. The upper piece of two-piece fascia shall be the same as specified above except that the fascia depth shall be at least 90 mm 3-1/2 inches, and shall overlap the lower fascia not less than 50 mm 2 inches.The lower piece shall be hooked 13 mm 1/2 inch over edge strip and splice plate and face nailed on 300 mm 12 inch centers 25 mm 1 inch below top ofsheet. The upper fascia shall be hemmed 13 mm 1/2 inch at lower edge and shall be formed to fit tight against lower fascia.

DOWNSPOUTS
Downspouts shall be set plumb and not less than 25 mm 1 inch from the wall. Leaders shall connect gutters on overhanging eaves to downspouts.Leaders shall be set with a slope not less than 0.3 degrees, 5 mm per m 1/16 inch per foot or more than 30 degrees below a horizontal line. Leaders shall fit over the outlet tube in gutter bottom and shall fit into and be riveted to the downspout. Rivet spacing shall be not more than 50 mm 2 inches. Strainers shall be set loosely in the eave tube opening in gutter. Joints between lengths of downspouts shall be made by telescoping the end of the upper lengths at least 19 mm 3/4 inch into the lower length. Downspouts terminating in drainage lines shall be neatly fitted into downspout boots and the joint filled with a portland cement mortar caps loped away from downspout. Downspouts terminating at splash blocks or splash pans shall be provided with stock elbow-type fittings. Downspout hangers shall be provided adjacent to the joint at the top of each section of downspout, except that the bottom section shall have an additional strap adjacent to the bottom joint when splash blocks or splash pans are required. Hangers shall be 1.5 x 25 mm 1/16 x 1 inch flat stock of the same material as the downspout.

GUTTERS
Gutters shall terminate at least 13 mm 1/2 inch away from vertical surfaces. [Supporting cleats shall be anchored to the structure at spacings not exceeding 400 mm 16 inches.] [Gutter brackets and spacers shall be fastened to roof nailer by screws or deformed shank-type nails and shall interlock with or be fastened to the leading edge of gutter. Gutter spacers shall be 1.5 x 25 mm 1/16 x 1 inch flat-stock of the same material as the gutter. Brackets and spacers shall be alternated at not more than 900 mm 36 inches on centers.] Gutters shall be hung with high points at ends or equidistant from downspouts and shall [be level] [have a slope of not less than 0.3 degrees 5 mm per m 1/16 inch per foot].

SCUPPER LININGS
The interior of scupper openings shall be lined with sheet metal. The lining shall be formed to return not less than 25 mm 1 inch against both faces of the wall or parapet with the outside edges folded under 13 mm 1/2 inch less on the top and sides. The perimeter of the lining shall be approximately 13 mm 1/2 inch less than the perimeter of the scupper. The top and sides of scuppers on the roof-deck side shall be joined to base flashing by a locked and soldered joint. The bottom edge shall be joined by a locked and soldered joint to the base flashing and where required,shall be formed with a ridge to act as a gravel stop around the scupper inlet. Surfaces to receive the lining shall be coated with bituminouscement.

SPLASH PANS
Install splash pans where downspouts discharge on roof surfaces and at other locations as indicated. Pans shall be of size indicated. Pans and roof flanges shall be bedded in plastic bituminous cement and strip flashed.

CONTRACTOR QUALITY CONTROL
Establish and maintain a quality control procedure for sheet metal used in conjunction with roofing to assure compliance of the installed sheet metalwork with the contract requirements. Promptly remove and replace or correct any work found not to be in compliance with the contract in an approved manner. Submit a Quality Assurance Plan, including a checklist of points to be observed, prior to start of roofing work. Quality control shall include, but not be limited to, the following: Observation of environmental conditions; number and skill level of sheet metal workers; condition of substrate. Verification of compliance of materials before, during, and after installation. Inspection of sheet metalwork, for proper size and thickness, fastening and joining, and proper installation.</li> </ol> The actual quality control observations and inspections shall be documented and a copy of the documentation furnished to the Contracting Officer at the end of each day.

{| class="wikitable" ! Item Designation !! Type of Joint 75 mm : 3 inch lap for expansion joint Cap piece 75 mm : 3 inch lap
 * + TABLE 2 - COPPER SHEET METAL JOINTS
 * Building expansion joint at roof || 32 mm : 1-1/4 inch single lock standing seam, cleated
 * Cleats (Continuous) || Butt
 * Flashings: Base || 25 mm : 1 inch flat locked, soldered
 * Cleats (Continuous) || Butt
 * Flashings: Base || 25 mm : 1 inch flat locked, soldered
 * Flashings: Base || 25 mm : 1 inch flat locked, soldered
 * Cap - in reglet || 75 mm : 3 inch lap
 * Cap - two - piece || Receiver 75 mm : 3 inch lap
 * Cap - two - piece || Receiver 75 mm : 3 inch lap
 * Cap - two - piece || Receiver 75 mm : 3 inch lap
 * Stepped || 75 mm : 3 inch lap
 * Through-wall spandrel flashing (metal) || 38 mm : 1-1/2 inch mechanical interlock
 * Valley || 150 mm : 6 inch lap, cleated
 * Sheet, corrugated || Butt with 6 mm : 1/4 inch
 * Sheet, smooth || Butt with 6 mm : 1/4 inch space
 * Gutters || 38 mm : 1-1/2 inch lap, riveted andsoldered
 * Pitch pockets || 25 mm : 1 inch soldered lap
 * Reglets || Butt joint
 * Sheet, smooth || Butt with 6 mm : 1/4 inch space
 * Gutters || 38 mm : 1-1/2 inch lap, riveted andsoldered
 * Pitch pockets || 25 mm : 1 inch soldered lap
 * Reglets || Butt joint
 * Pitch pockets || 25 mm : 1 inch soldered lap
 * Reglets || Butt joint
 * Reglets || Butt joint
 * Reglets || Butt joint