> Project Number: AW 2226
>
> Contract Number: TW-0681
>
> Date: May 5, 1995

SPECIAL SPECIFICATION

SECTION 07600

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

[Page]{.underline}

PART 1- GENERAL

1.01 Description of Work 2

1.02 References 2

1.03 Submittals 3

1.04 Quality Assurance 3

PART 2- PRODUCTS

2.01 Materials 3

2.02 Accessory Materials 5

2.03 Preformed Reglet Flashing Systems 5

2.04 Fabrication - General 5

2.05 Gutters and Downspouts 6

PART 3- EXECUTION

3.01 Examination 6

3.02 Preparation 6

3.03 Installation 7

3.04 Cleaning and Protection 8

**SPECIAL SPECIFICATION**

**SECTION 07600**

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

# PART 1 - GENERAL

## 1.01 [DESCRIPTION OF WORK]{.underline}

A. [Section Includes]{.underline}:

1\. Sheet metal flashing and trim.

2\. Flexible flashings.

3\. Gutters and downspouts.

4\. Fasteners and attachment devices.

5\. Coatings to isolate sheet metal from dissimilar materials.

B. [Related Sections]{.underline}: Refer to Division 7, Section
"Manufactured Metal Roof Panels" and "Manufactured Metal Wall Panels"
for related work.

## 1.02 [REFERENCES]{.underline}

A. [Architectural Sheet Metal Manual]{.underline}; Sheet Metal and Air
Conditioning Contractors' National Association, Inc. (SMACNA)

B. [American Society for Testing and Materials (ASTM)]{.underline}

A526 Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) by
the Hot-Dip Process, Commercial Quality

A527 Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) by
the Hot-Dip Process, Lock-Forming Quality

D412 Standard Test Methods for Vulcanized Rubber and Thermoplastic
Rubbers and Thermoplastic Elastomers-Tension

D573 Standard Test Method for Rubber\--Deterioration in an Air Oven

D746 Standard Test Method for Brittleness Temperature of Plastics and
Elastomers by Impact

D1149 Standard Test Method for Rubber Deterioration-Surface Ozone
Cracking in a Chamber

D2240 Standard Test Method for Rubber Property-Durometer Hardness

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

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

## 1.03 [SUBMITTALS]{.underline}

A. [Product Data]{.underline}: Manufacturer's technical information and
installation instructions, in sufficient detail to demonstrate products
comply with Contract documents.

B. [Shop Drawings]{.underline}: Drawings clearly indicating component
profiles, joints, transitions, fastening methods, and relationship of
flashing materials to adjacent construction.

## 1.04 [QUALITY ASSURANCE]{.underline}

[Quality Standard]{.underline}: Fabricate and install sheet metal work
in accordance with Architectural Sheet Metal Manual and SMACNA, unless
specifically indicated otherwise.

# PART 2 - PRODUCTS

## 2.01 [MATERIALS]{.underline}

A. [Galvanized Steel Sheet]{.underline}: ASTM A526, commercial quality,
G90 hot-dip galvanized.

Finish: Factory primed (coil coated).

B. [Prefinished Galvanized Steel Sheet]{.underline}: Coil coated,
commercial quality steel sheet, ASTM A526 or ASTM A527, G90 hot-dip
galvanized.

1\. Finish: 70 percent "Kynar 500" or "Hylar 5000" resin finish over
epoxy primer; minimum system thickness 1.0 mil (0.0254 mm). Provide
manufacturer's standard prime coat on underside.

Color: Match color of adjacent materials.

2\. Provide strippable plastic protective film on prefinished surface.

3\. Manufacturer: Subject to compliance with specified requirements and
compatibility with adjacent materials, products of the following
manufacturers will be among those considered acceptable:

Atas Aluminum Corporation

> Copper Sales, Inc.
>
> MM Systems Corporation
>
> Petersen Aluminum Corporation
>
> Vincent Metals Division/Rio Algom, Inc.

C. [Sheet Rubber Flashing]{.underline}: Use uncured neoprene or EPDM
sheet.

D. [EPDM Flashing]{.underline}: Uncured EPDM sheet; minimum 60 mil
(1.524 mm) thickness; minimum properties as follows:

1\. Tensile Strength (ASTM D412): 1305 pounds per square inch (9000
kPa).

2\. Elongation (ASTM D412): 300 percent.

3\. Tear Resistance (ASTM D412): 150 pounds per inch (26,300 N/m).

4\. Ozone Resistance (ASTM D1149): No cracks after 168-hour exposure to
one part per million ozone at 104 degrees F (40 degrees C) and 20
percent strain.

5\. Maximum Brittleness Temperature (ASTM D746): Minus 49 degrees F
(minus 45 degrees C).

6\. Resistance to Heat Aging (ASTM D573): Minimum properties (ASTM D412)
after aging at 240 degrees F (116 degrees C) for 672 hours.

a\. Tensile Strength: 1205 pounds per square inch (8310 kPa).

b\. Elongation: 200 percent.

c\. Tear Resistance: 125 pounds per inch (21,900 N/m).

E. [Neoprene Sheet Flashing]{.underline}: Uncured neoprene sheet;
minimum 60 mil (1.524 mm) thickness; minimum properties as follows:

1\. Shore Hardness (ASTM D2240): Minimum, 55 plus or minus 10.

2\. Tensile Strength (ASTM D412): 1305 pounds per square inch (9000
kPa).

3\. Elongation (ASTM D412): 250 percent.

4\. Tear Resistance (ASTM D412): 150 pounds per inch (26,300 N/m).

5\. Ozone Resistance (ASTM D1149): No cracks after 168-hour exposure to
one part per million ozone at 104 degrees F (40 degrees C) and 20
percent strain.

6\. Maximum Brittleness Temperature (ASTM D746): Minus 35 degrees F
(minus 37 degrees C).

7\. Resistance to Heat Aging (ASTM D573): Minimum properties (ASTM D412)
after aging at 240 degrees F (116 degrees C) for 672 hours as follows:

a\. Tensile Strength: 1000 pounds per square inch (6900 kPa).

b\. Elongation: 150 percent.

c\. Tear Resistance: 125 pounds per inch (21,900 N/m).

F. [Foam Backing for Flexible Flashings]{.underline}: Closed-cell foam
rubber; polyethylene, neoprene, or similar soft, compatible material.

## 2.02 [ACCESSORY MATERIALS]{.underline}

A. [Fasteners]{.underline}: Corrosion-resistant metal of same material
as the material being fastened, or other material recommended by sheet
metal manufacturer. Match finish and color of exposed fastener heads to
finish and color of sheet material being fastened.

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

C. [Sealant]{.underline}: Comply with requirements of Contract
documents.

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

## 2.03 [PREFORMED REGLET FLASHING SYSTEMS]{.underline}

A. [General]{.underline}: Fabricate reglet flashing system from 24 gage
(0.607 mm) galvanized steel sheet formed to provide secure interlocking
of separate reglet and counterflashing pieces.

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

## 2.04 [FABRICATION - GENERAL]{.underline}

A. [Fabricate sheet metal]{.underline} using sheet metal thicknesses
indicated on the drawings or schedules.

B. [Form sheet metal]{.underline} to match profiles indicted,
substantially free from oil-canning, fish-mouths, and other defects.

C. [Comply with Architectural Sheet Metal Manual, SMACNA]{.underline}
for applications indicated.

D. [Provide for thermal expansion]{.underline} of exposed sheet metal
work exceeding 15 feet (4.6 m) running length.

Flashing and Trim: Provide movement of joints at maximum spacing of 10
feet (3 m); no joints allowed within 2 feet (0.6 m) of corner of
intersection.

E. [Conceal fasteners and expansion]{.underline} provisions wherever
possible.

Exposed fasteners are not allowed on faces of sheet metal exposed to
public view.

F. [Form a 1/2 inch (12.7 mm) hem]{.underline} on underside of exposed
edges.

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

Gage: As recommended by SMACNA or metal manufacturer for application,
but in no case less than gage of metal being secured.

## 2.05 [GUTTERS AND DOWNSPOUTS]{.underline}

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

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

C. [Provide expansion joints]{.underline} in gutters at spacing not to
exceed 30 feet (9 m).

D. [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).

E. [Provide precast]{.underline} concrete splash blocks at downspout
discharge.

F. [Provide formed metal splash pans]{.underline} fabricated from same
type of sheet metal used for downspouts. Locate and secure where
downspout discharges onto lower roof.

G. [Gutter Support]{.underline}: Straps.

H. [Downspout Supports]{.underline}: Brackets.

I. [Back-paint concealed metal surfaces]{.underline} with bituminous
coating to a minimum of 15 mils (0.381 mm) dry film thickness.

# PART 3 - EXECUTION

## 3.01 [EXAMINATION]{.underline}

A. [Examine substrates and conditions]{.underline} under which products
of this section are to be installed and verify that work may properly
commence. Do not proceed with the work until unsatisfactory conditions
have been fully resolved.

B. [Verify that nailers]{.underline}, blocking and other attachment
provisions for sheet metal work are properly located and securely
fastened to resist effects of wind and thermal stresses.

## 3.02 [PREPARATION]{.underline}

A. [Verify shapes and dimensions]{.underline} 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}: Comply with sheet metal manufacturer's
installation methods and recommendations in the Architectural Sheet
Metal Manual, SMACNA.

B. [Sealed Joints]{.underline}: Form minimum 1 inch (25 mm) hooked
joints and embed flange into sealant or adhesive. Form metal to
completely conceal sealant or adhesive.

1\. Use joint adhesive for nonmoving joints specified not to be
soldered.

2\. Moving joints: 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 Division 7, Section "Joint Sealants," for handling and
installation requirements for joint sealers.

C. [Soldered Joints]{.underline}

1\. Clean surfaces to be soldered, removing oils and foreign matter.

2\. Pretin edges of sheets to be soldered to a width of 1-1/2 inches
(38.1 mm), except where pretinned surface would show in the finished
work.

3\. Do not use torches for soldering.

4\. Heat surfaces to receive solder and flow solder into joint. Fill
joint completely.

5\. Completely remove flux and spatter from exposed surfaces.

D. [Surface-Mounted Reglets]{.underline}: Attach reglets securely to
substrate, at locations indicated. Install elastomeric sealant at top
edge. Refer to Division 7, Section "Joint Sealants," for handling and
installation requirements for joint sealers.

E. [Counterflashings]{.underline}: Coordinate installation of
counterflashings with installation of assemblies to be protected by
counterflashing. Install counterflashings in reglet or receiver of other
sheet metal fabrication. Secure in a waterproof manner by means of
snap-in installation and sealant, interlocking folded seam, or blind
rivets and sealant. Lap counterflashing joints a minimum of 2 inches
(50.8 mm) and bed with sealant.

F. [Flexible Flashing Installation]{.underline}

1\. Comply with flashing manufacturer's instructions regarding surface
preparation, handling, use of adhesives, and use of fasteners.

2\. Take care during and after installation to avoid puncture or rupture
of flexible flashing.

3\. Secure flexible flashing to vertical surfaces using adhesive or
combination of adhesive and fasteners.

4\. Form continuous watertight seams between pieces of material using
seam adhesive as recommended by flashing manufacturer.

5\. Do not stretch flexible flashing sheets tight between points of
anchorage. At moving joints or where drawings indicate slack or loop in
flashing, form to approximate profile indicated and adhere foam rubber
filler to back of flexible flashing. Anchor edges in a bed of sealant.

## 3.04 [CLEANING AND PROTECTION]{.underline}

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

B. [Repair or replace work]{.underline} which is damaged or defaced, as
directed by the Sandia Delegated Representative (SDR).

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

C. [Protect sheet metal work]{.underline} as recommended by the
installer so that completed work will be clean, secured, and without
damage at substantial completion.

END OF SECTION