**November 21, 1997**

Contract \# **TW-0928**

**SPECIAL SPECIFICATION**

**SECTION 07600-S**

**[FLASHING AND SHEET METAL]{.underline}**

[PART 1 - GENERAL]{.underline} [Page]{.underline}

1.01 Description of Work 2

1.02 References 2

1.03 Submittals 3

1.04 Quality Assurance 3

[PART 2 - PRODUCTS]{.underline}

2.01 Manufacturers 5

2.02 Materials 5

2.03 Reglets 6

2.04 Miscellaneous Materials and Accessories 6

2.05 Fabrication, General 7

2.06 Sheet Metal Fabrications 8

[PART 3 - EXECUTION]{.underline}

3.01 Examination 10

3.02 Preparation 10

3.03 Installation 10

3.04 Cleaning and Protection 11

**SPECIAL SPECIFICATION**

**SECTION 07600-S**

**[FLASHING AND SHEET METAL]{.underline}**

PART 1 - GENERAL

1.01 [DESCRIPTION OF WORK]{.underline}

A. [Section Includes]{.underline}: This section includes furnishing and
installing flashing and sheet metal as indicated on Contract documents
and by provisions of this section.

B. [Section Does Not Include]{.underline}:

1\. Flashings which are integral with membrane roofing or waterproofing
systems (base flashings).

2\. Flashings which are integral with prefabricated roof accessories and
equipment.

3\. Wood blocking, nailers, edge strips, and battens.

C. [Related Sections]{.underline}:

1\. Division 4, Section "Concrete Masonry Unit"

2\. Division 7, Section "Joint Sealants"

3\. Division 15, Section "Ductwork"

1.02 [REFERENCES]{.underline}

A. [Factory Mutual Systems (FM)]{.underline}

Loss Prevention Data Sheet 1-49 Perimeter Flashing

B. [Federal Specification (FS)]{.underline}

TT-C-494 Coating Compound, Bituminous, Solvent Type, Acid Resistant

C. [Sheet Metal and Air Conditioning Contractors National Association
(SMACNA)]{.underline}

Architectural Sheet Metal Manual

1.03 [SUBMITTALS]{.underline}

A. [General]{.underline}: Submit the following in accordance with
provisions of Section 1300-S, "Descriptive Submittals."

B. [Product Data]{.underline}: Submit manufacturer's material and finish
data, installation instructions, and general recommendations for each
specified flashing material and fabricated product.

C. [Samples for Initial Selection Purposes]{.underline}: Submit
manufacturer's color charts and texture variations for specified sheet
materials to be exposed as finished surfaces.

D.  [Provide written certification]{.underline} that all materials used
    are asbestos-free and lead paint- free.

E.  Mockup: Incorporate products specified here, into the mockup
    described in Section 03450.

1.04 [QUALITY ASSURANCE]{.underline}

A. [Installer Qualifications]{.underline}: Engage an experienced
installer who has completed flashing, sheet metal, and trim work similar
in material, design, and extent to that indicated for project that have
resulted in construction with a record of successful in-service
performance.

B. [Quality Standard]{.underline}: Fabricate and install sheet metal
work in accordance with Sheet Metal and Air Conditioning Contractor's
National Association, Inc. (SMACNA) "Architectural Sheet Metal Manual,"
unless specifically indicated otherwise.

C. [Wind Resistance]{.underline}: Fabricate and install flashings at
edges of roof in accordance with FM Loss Prevention Data Sheet 1-49 for
specified wind zone. Ensure that substrate construction is also in
compliance.

PART 2 - PRODUCTS

2.01 [MANUFACTURERS]{.underline}

[Products made by the following manufacturers]{.underline} will be among
those considered acceptable, however, it is the Contractor's
responsibility to provide only products compatible with adjacent
materials in the assembly.

ATAS Aluminum Corporation

Copper Sales, Inc.

Fry Reglet Corporation

Keystone Flashing Company

MM Systems Corporation

Petersen Aluminum Corporation

Vincent Metals

2.02 [MATERIALS]{.underline}

A. [General]{.underline}: Unless otherwise indicated on Contract
documents, provide Aluminum , as standard material with a fluoropolymer
"Kynar 500" or "Hylar 5000" factory finish.

1\. Color: Custom color to match Benjamin Moore #1393.

2.03 [REGLETS]{.underline}

A. [General]{.underline}: Units of type, material, and profile
indicated, formed to provide secure interlocking of separate reglet and
counterflashing pieces and compatible with flashing indicated.

B. [Surface Mounted Type]{.underline}: Provide with slotted holes for
fastening to substrate, with neoprene or other suitable weatherproofing
washers, and with channel for sealant at top edge.

C. [Concrete Type]{.underline}: Provide temporary closure tape to keep
reglet free of concrete materials, special fasteners for attaching
reglet to concrete forms, and guides to ensure alignment of reglet
section ends.

D. [Masonry Type]{.underline}: Provide with offset top flange for
embedment in masonry mortar joints. E. [Counterflashing Wind-Restraint
Clips]{.underline}: Provide hold down clips with 1/2 inch (12.7 mm)
kickout to be installed before counterflashing to prevent wind uplift on
the counterflashing lower edge. Fabricate the clips of the following
materials:

Galvanized Steel: 22 gage; 0.0336 inch (0.8534 mm) thick.

2.04 [MISCELLANEOUS MATERIALS AND ACCESSORIES]{.underline}

A. [Fasteners]{.underline}: Same metal as sheet metal flashing or other
noncorrosive metal as recommended by sheet metal manufacturer. Match
finish of exposed heads with material being fastened.

B. [Mastic Sealants]{.underline}: Polyisobutylene; Nonhardening,
nonskinning, nondrying, nonmigrating sealant.

C. [Metal Accessories]{.underline}: Provide sheet metal clips, straps,
anchoring devices, and similar accessory units as required for
installation of work, matching or compatible with material being
installed; Noncorrosive; Size and thickness required for performance.

D. [Installation Accessories]{.underline}: Provide joint tape,
adhesives, sealers, and fasteners as recommended by flashing
manufacturer for indicated applications.

E. [Bituminous Coating]{.underline}: Heavy bodied, sulfur-free,
asphalt-based paint; FS TT-C-494.

2.05 [FABRICATION, GENERAL]{.underline}

A. [Sheet metal fabrication standard]{.underline}: Fabricate sheet metal
flashing and trim to comply with recommendation of SMACNA's
"Architectural Sheet Metal Manual" that apply to the design, dimensions,
metal and other characteristics of the item indicated.

B. [Comply with details shown]{.underline} to fabricate sheet metal
flashing and trim that fit substrates and result in waterproof and
weather resistant performance once installed. Verify shapes and
dimensions of surfaces to be covered before fabricating sheet metal.

C. [Form exposed sheet metal]{.underline} work that is without excessive
oil canning, buckling, and tool marks and that is true to line and
levels indicated, with exposed edges folded back to form hems.

D. [Seams]{.underline}: Fabricate nonmoving seams in sheet metal
flat-lock seams.

E. [Sealed Joints]{.underline}: Form nonexpansion, but movable joints in
metal to accommodate elastomeric sealant to comply with SMACNA
standards.

F. [Expansion Provisions]{.underline}: Space movement joints at maximum
of 10 feet (3 m) with no joints allowed within twenty four (24) inches
(610 mm) of corner or intersection. Where lapped or bayonet-type
expansion provisions in work cannot be used or would not be sufficiently
weatherproof and waterproof, form expansion joints of intermeshing
hooked flange, not less than one (1) inch (25 mm) deep filled with
mastic sealant concealed within joints.

G. [Separate metal]{.underline} from noncompatible metal or corrosive
substrates by coating concealed surfaces at locations of contact with
asphalt mastic or other permanent separation as recommended by
manufacturer.

H. [Conceal fasteners]{.underline} and expansion provisions where
possible. Exposed fasteners are not allowed on faces of sheet metal
exposed to public view.

I. [Fabricate cleats]{.underline} and attachment devices from same
material as sheet metal component being anchored or from compatible,
noncorrosive metal recommended by SMACNA or sheet metal manufacturer.

Size: As recommended by SMACNA manual or sheet metal manufacturer for
application but never less than thickness of metal being secured.

J. [Form a one-half inch]{.underline} (12.7 mm) hem on underside of
exposed edges.

2.06 [SHEET METAL FABRICATIONS]{.underline}

A. [General]{.underline}: As a minimum, fabricate flashings using
materials in the thickness listed for each flashing application or as
recommended by the SMACNA Manual. B. [Exposed Flashings-Low Slope Roofs
or Waterproofing]{.underline}: Formed copings, gravel stops and
scuppers:

1\. Aluminum (.05 inch).

C. [Semiconcealed Flashings-Low Slope Roofs or
Waterproofing]{.underline}: Counter flashing, reglets, equipment support
flashing, roof area joint and roof expansion joint covers and
pipe/conduit penetration flashing:

1\. Aluminum 20 gage (.032 inch).

D. [Miscellaneous Flashings]{.underline}

1\. Aluminum 20 gage (.032 inch).

E. [Gutters and Downspouts]{.underline}

1\. [Fabricate]{.underline} from same material and finish used for
adjacent exposed flashings.

2\. [Form sheet metal]{.underline} to profile dimensions indicated, free
from distortions and defects detrimental to water-tight system.

3\. [Provide expansion joints]{.underline} in gutters at spacing not to
exceed 30 feet (9 m). Drain each section to allow water to drain that is
otherwise trapped by expansion joint ridges.

4\. [Provide removable debris screens]{.underline} for gutters,
fabricated from 1/4 inch (6.35 mm) mesh wire cloth of same material used
for gutters or approved compatible material. Provide formed sheet metal
frame on 4 sides of each screen unit. Length of screen units not to
exceed 10 feet (3 m).

5\. [Provide wire basket]{.underline} type strainers at downspouts,
fabricated from wire and sheet metal of same material used for
downspouts or approved compatible material.

6\. [Provide sheet metal baffles]{.underline} 6 inches (152 mm) high
with legs 18 inches (457 mm) long at gutter corners below roof valleys.

7\. [Provide Sandia National Laboratory's Standard Drawing No.
94169A1]{.underline} for precast concrete splash blocks at downspout
discharge.

8\. [Gutter supports]{.underline}: Brackets spaced at 30 inches (762 mm)
on center.

9\. [Downspout supports]{.underline}: 20 gage, (0.0396 inch) (1.006 mm)
straps at each joint and at center of section.

10\. [Back-paint]{.underline} concealed metal surfaces with bituminous
coating to a minimum of 15 mils (0.38 mm) dry film thickness.

PART 3 - EXECUTION

3.01 EXAMINATION

[Examine substrates and conditions]{.underline} under which sheet metal
flashing and trim are to be installed and verify that work may properly
commence. Do not proceed with installation until unsatisfactory
conditions have been corrected.

3.02 [PREPARATION]{.underline}

A. [Verify shapes]{.underline} and dimensions of surfaces to be covered
before fabricating sheet metal.

B. [Isolate dissimilar metals]{.underline} by means of a heavy
bituminous coating, approved paint coating, adhered polyethylene sheet,
or other means approved by the Sandia Delegated Representative (SDR).

3.03 [INSTALLATION]{.underline}

A. [General]{.underline}: Unless otherwise indicated, install sheet
metal flashing and trim to comply with performance requirements,
manufacturer's installation instructions, and SMACNA's "Architectural
Sheet Metal Manual." Anchor units of work securely in place by methods
indicated, providing for thermal expansion of metal units; Conceal
fasteners where possible, and set units true to line and level as
indicated. Install work with laps, joints, and seams that will be
permanently watertight and weatherproof.

B. [Install exposed sheet metal]{.underline} work that is without
excessive oil canning, buckling, and tool marks and that is true to line
and levels indicated, with exposed edges folded back to form hems.
Install sheet metal flashing and trim to fit substrates and to result in
waterproof and weather-resistant performance. Verify shapes and
dimensions of surfaces to be covered before fabricating sheet metal.

C. [Sealed Joints]{.underline}: Form nonexpansion, but moveable joints
in metal to accommodate elastomeric sealant to comply with SMACNA
standards. Fill joints with sealant and form metal to completely conceal
sealant.

1\. [Use joint adhesive]{.underline} for nonmoving joints specified not
to be soldered.

2\. [Moving Joints]{.underline}: When ambient temperature is moderate
(40 - 70 degrees F) (4 - 21 degrees C) at time of installation, set
joined members for 50 percent movement either way. Adjust setting
position of joined members proportionally for temperatures above 70
degrees F (21 degrees C). Do not install sealant at temperatures below
40 degrees F (4 degrees C). Refer to section on sealants, elsewhere in
Division 7, for handling and installation requirements for joint
sealers.

D. [Counterflashings]{.underline}: Coordinate installation of
counterflashings with installation of assemblies to be protected by
counterflashing. Install counterflashings in reglets or receivers.
Secure in a waterproof manner by means of snap-in installation and
sealant, lead wedges and sealant, interlocking folded seam, or blind
rivets and sealant. Lap counterflashing joints a minimum of two (2)
inches (51 mm) and bed with sealant.

E. [Install continuous gutter screens]{.underline} on gutters with
noncorrosive fasteners, arranged as hinged units to swing open for
cleaning gutters.

F. [Roof Edge Flashings]{.underline}: Secure metal flashings at roof
edges to comply with FM Loss Prevention Data Sheet 1-49 for Zone 2 wind
exposure.

G. [Surface-Mounted Reglets]{.underline}: Attach reglets securely to
substrate, at locations indicated. Install elastomeric sealant at top
edge.

3.04 [CLEANING AND PROTECTION]{.underline}

A. [Remove protective film]{.underline} from prefinished sheet metal
immediately after installation.

B. [Repair or replace work]{.underline} which is damaged or defective,
as directed by SDR.

Refinish marred and abraded areas of prefinished sheet using finish
manufacturer's recommended methods and materials. Replace units which
cannot satisfactorily be refinished in place.

C. [Clean exposed metal surfaces]{.underline}, removing substances that
might cause corrosion of metal or deterioration of finishes.

D. [Provide final protection]{.underline} and maintain conditions that
ensure sheet metal flashing and trim work during construction is without
damage or deterioration other than by natural weathering.

END OF SECTION