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REMOVE THIS OUTLINE GUIDE BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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O U T L I N E G U I D E

[DIVISION 7: THERMAL AND MOISTURE PROTECTION]{.underline}

SECTION 07620 ‑ SHEET METAL FLASHING AND TRIM

USE: Furnishing and installing sheet metal flashing and trim. Unique job
requirements may require specific coverage in the following
specification sections:

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[[ ]{.underline}\] provide for
information to be inserted, as appropriate to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface,
**and *italics* within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately).

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED. **Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name Of The Project (upper/lower case).**
Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specifications that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST-110
or call (303) 987-6851.

F. DESIGN NOTES:

1\. **DRAWING DATA REQUIRED:**

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes 10/99

Metric: Not Applicable

Technical Update: 8/00

SECTION 07620

SHEET METAL FLASHING AND TRIM

[PART 1: GENERAL]{.underline}

1.1 SUMMARY

A. Section Includes: Furnishing and installing galvanized sheet metal
flashing and trim.

B. Related Sections:

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LIST ITEMS OF WORK THAT MIGHT LOGICALLY BE FURNISHED AND INSTALLED IN
THIS SECTION, BUT INSTEAD ARE SPECIFIED IN ANOTHER SECTION. THIS ARTICLE
IS RARELY REQUIRED.

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1.2 SUBMITTALS

A. General: Submittals shall be according to \[Section 01009 - General
Information and Requirements.\] \[and\] \[Section 01330 - Submittal
Procedures\] \[and\] \[Section 01331 - Certificates.\]

B. Certificates of Conformance: Submit \[[ ]{.underline}\] copies of
written certification from the supplier of the Contractor‑furnished
sheet metal flashing and trim to be used on this project that they
conform to the requirements of this specification section.

C. Shop Drawings: Submit \[[ ]{.underline}\] copies of shop drawings for
the sheet metal flashing and trim to be used on this project. Shop
drawings shall indicate thickness, dimensions, fastenings, and anchoring
methods, expansion joints, and other provisions necessary for thermal
expansion and contraction. Sealed catalog cuts may be submitted for
factory fabricated items.

1.3 QUALITY ASSURANCE

A. Failure Criteria: Not limited to the following:

1\. Rusting.

2\. Joint leaking.

3\. Metal pulling loose from subsurface.

1.4 DELIVERY, STORAGE, AND HANDLING

A. Storage: Crated materials shall not be uncrated until ready for use.
Store materials in dry, weather‑tight, ventilated areas until
immediately before installation.

[PART 2: PRODUCTS]{.underline}

2.1 MATERIALS

A. Zinc‑Coated (Galvanized) Sheet and Strip: Shall be according to ASTM
A 525. Lengths of 8 or l0 feet. Single pieces less than 8 feet long may
be used to connect to factory fabricated corners, and at ends of runs.
Gauges shall be 24 or 26 as indicated on drawing details. Also see
Table 1. The heavier gauge shall govern. Metal shall be suitably
factory‑marked to permit identification.

B. Nails: Flat head, diamond point, bright, smooth finish zinc or cement
coated. Length shall be sufficient to penetrate backing materials 3/4
inch minimum.

C. Solder: Shall be according to ASTM B 486.

D. Flux: Consistent with solder, acid type.

[PART 3: EXECUTION]{.underline}

3.1 PREPARATION

A. Subsurfaces: Surfaces to receive sheet metal must be plumb and true,
clean, even, smooth, dry and free from defects and projections which
might affect the application. Installation of items not shown in detail
or not covered by specifications shall meet the applicable requirements
of the SMACNA Architectural Sheet Metal Manual.

3.2 INSTALLATION/APPLICATION

A. Workmanship: Fabricate sheet metal items to the gauge shown in Table
I, and join multiple lengths of items together. Install sheet metal work
with lines, arises, and angles sharp and true. Exposed surfaces shall be
free from visible wave, warp, buckle and tool marks. Exposed edges shall
be folded back neatly to form a 1/2 inch hem on the concealed side.
Sheet metal exposed to the weather shall be watertight with provisions
for expansion and contraction.

B. Nailing: Nailing of sheet metal shall be confined generally to sheet
metal having a maximum width of 18 inches. Nails shall be evenly spaced
not more than 3 inches oc and approximately 1/2 inch from edge unless
otherwise specified or indicated. Face nailing will not be permitted.

C. Cleats: Provide cleats for sheet metal 18 inches and over in width.
Space cleats evenly not more than 12 inches oc unless otherwise
specified or indicated. Unless otherwise specified, cleats shall be not
less than 2 inches wide by 3 inches long and of the same material and
thickness as the sheet metal being installed. One end of the cleat shall
be secured with two nails and the cleat folded back over the nailheads.
The other end shall be locked into the seam. Cleats for soldered seams
shall be pre‑tinned.

D. Bolts, Rivets, and Screws: Install where indicated or required.
Provide compatible washers where required to protect surface of sheet
metal and to provide a watertight connection.

E. Roof Protrusions: Provide flashing in the angles formed where roof
decks abut walls, curbs, ventilators, pipes, ducts, conduits, guywire
anchors or other vertical surfaces projecting through the roof surface
and wherever indicated and necessary to make the work watertight.

1\. Pitch pockets will not be accepted.

F. Seams: Straight and uniform in width and height with no solder
showing on the face.

1\. Flat‑lock: Finish not less than 3/4 inch wide.

2\. Lap: Finish soldered seams not less than one inch wide. Overlap
seams not soldered, not less than 3 inches.

3\. Loose‑lock Expansion: Not less than 3 inches wide, and shall provide
minimum one inch movement within the joint. Joint shall be completely
filled with the specified sealant, applied at not less than 1/8 inch
thick bed. Sealants are specified in Section 07920 ‑ Sealants and
Caulking.

4\. Standing: Not less than one inch high, double locked without solder.

5\. Flat: Make seams in the direction of the flow.

G. Soldering: Pre‑tin edges of sheet metals, except lead coated
material, before soldering is begun. Soldering shall be done slowly with
well heated soldering irons so as to thoroughly heat the seams and
completely sweat the solder through the full width of the seam.
Soldering shall follow immediately after application of the flux. Upon
completion of soldering the acid flux residue shall be thoroughly
cleaned from the sheet metal with a solution of washing soda in water
and rinsed with clean water.

H. Base Flashing: Where sloped roofs abut chimneys, curbs, walls or
other vertical surfaces, the base flashings shall be laid in with each
course of the roof covering, shingle fashion where practicable. The
flashing shall extend up vertical surfaces not less than 8 inches, and
not less than 4 inches under the roof covering. Where finish wall
coverings form a counterflashing, the vertical leg of the flashing shall
extend up behind the applied wall covering not less than 6 inches.
Flashing strips shall overlap the previously laid flashing not less than
3 inches; strips shall be fastened at their upper edge to the deck, with
compatible largehead roofing nails. End laps shall be soldered, except
that provision shall be made for expansion and contraction. At the
upslope side of vertical surfaces extending through sloping roofs, the
metal flashings shall extend over crickets. At the lower side of
vertical surfaces extending through the roof decks, metal flashings
shall extend onto the roof covering not less than 4‑1/2 inches.
Flashings shall be installed and fitted so as to be completely
weathertight.

I. Counterflashing: Except where indicated or specified otherwise,
insert counterflashing in reglets located from 9 to 10 inches above roof
decks and extend down vertical surfaces over upturned vertical leg of
base flashings not less than 3 inches. Exposed edges of counterflashings
shall be folded 1/2 inch. Where stepped counterflashings are required,
they may be installed in short lengths or may be of the pre‑formed
one‑piece type. End laps in counterflashings shall be not less than 3
inches and shall be made weathertight with plastic cement. Lengths of
metal counterflashings shall not exceed 10 feet. The flashings shall be
formed to the required shapes before installation. Corners shall be
factory formed with joints not less than 12 inches from the angle.
Flashings shall be secured in the reglets with lead wedges spaced not to
exceed 18 inches apart; on short runs, wedges shall be placed closer
together. Caulked‑type reglets or raked joints which receive
counterflashing shall be filled with caulking compound. Caulking is
covered in Section 07920 ‑ Sealants and Caulking. The concealed edge of
counterflashings built into masonry or concrete walls shall be turned up
not less than 1/4 inch and shall extend not less than 2 inches into the
walls. Counterflashing shall provide a spring action against base
flashing.

J. Caulked‑type Reglets: Provide with rounded edges and metal strap
brackets or other approved anchors for securing to the construction.
They shall be provided with an approved type core to protect them from
injury during the installation. Built‑up mitered corner pieces shall be
provided for internal and external angles. Flashing shall be wedged in
the reglets with lead wedges every 18 inches and shall be caulked full
and solid with an approved sealant.

K. Friction‑type Reglets: Provide with flashing receiving slots not less
than 5/8‑inch deep, one‑inch jointing tongues, and upper and lower
anchoring flanges. The flashing shall be inserted the full depth of the
slot and locked therein by indentations made with a dull‑pointed tool.

L. Gravel Stops and Roof Edge Fascias: Prefabricate in the shapes and
sizes indicated and in lengths not less than 8 feet. Extend flange at
least 4 inches onto roof deck. Provide prefabricated mitered corners for
internal and external corners. Install gravel stops and fascias after
all plies of the roofing membrane have been applied, but before the
flood coat of bitumen is applied. Prime roof flange of gravel stops and
fascias on both sides with an asphalt primer. After primer has dried,
set flange on top of the roofing felts in a 1/8 inch thick bed of
plastic cement. Nail flange securely to wood nailer with large‑head
barbed‑shank roofing nails 1‑1/2 inches long spaced not more than 3
inches oc. Roof shall cover flange with 9 inch wide strip of fiberglass
mopped solidly in asphalt.

1\. Hook Strips: The lower edge of fascias shall be hooked at least 3/4
inch over a continuous hook strip of the same material bent outward at
an angle of 45 degrees to form a drip. Nail hook strip to a wood nailer
at 6 inches maximum oc. Where fastening is made to concrete or masonry,
screws spaced 12 inches oc shall be used and shall be driven in
expansion shields set in the concrete or masonry. Where horizontal wood
nailers are slotted to provide for insulation venting, install hook
strips in such a manner that vent slots are not obstructed. Where
necessary install hook strips over 1/16‑inch thick compatible spacer or
washers.

2\. Joints: Section ends of gravel stops and fascias shall be left open
1/4 inch and backed with a formed flashing plate, mechanically fastened
in place and lapping each section end a minimum of 4 inches; set laps in
plastic cement. Face nailing will not be permitted.

M. Metal Drip Edge: Provide a metal drip, designed to allow water runoff
to drip free of underlying construction, at eaves and rakes prior to the
application of roofing shingles. Apply directly on the wood deck at the
eaves and over the underlay along the rakes, extend back from the edge
of the deck not more than 3 inches and secure with compatible nails
spaced not more than 10 inches oc along upper edge.

N. Scuppers: Line interior of scupper openings with sheet metal. The
lining shall extend through and project outside of the wall to form a
drip on the bottom edge and shall be formed to return not less than one
inch against the face of the outside wall at the top and sides. Outside
edges shall be folded under 1/2 inch less than the perimeter of the
scupper. The top and sides of the lining on the roof deck side shall be
joined to a closure flange by a locked and soldered joint. The bottom
edge shall be joined by a locked and soldered joint to the closure
flange and, where required, shall be formed with a ridge to act as a
gravel stop around the scupper inlet. Surfaces to receive the scupper
lining shall be primed and coated with bituminous plastic cement.

O. Conductor Heads: Fabricated of the same material as the downspouts.
Depth of top opening shall be equal to 2/3 of the width. Outlet tubes
shall not be less than 4 inches long. All seams shall be flat‑locked
soldered. Where conductor heads are used in conjunction with scuppers,
they shall be a minimum of 2 inches wider than the scupper, shall be
attached to the wall with masonry fasteners, and shall be loose‑locked
to the scupper drip. Conductor heads shall have screens of the same
material. Screens shall be securely fastened to the heads.

P. Splash Pans: Install splash pans where downspouts discharge on roof
surfaces and at other locations as indicated. Unless otherwise shown,
pans shall be not less than 24 inches long by 18 inches wide and shall
have metal ribs across the bottom of the pan. The sides of the pan shall
be formed with vertical baffles not less than one inch high in the front
and 4 inches high in the back of the pan, doubled over and formed
continuous with horizontal roof flanges not less than 4 inches wide. The
rear flange of the pan shall be bent to contour of cant strip and shall
extend up 6 inches under the side wall covering or to height of base
flashing under counterflashing. Pans and roof flanges shall be bedded in
plastic bituminous cement and strip flashed.

Q. Open Valley Flashing: Valley flashing shall be free from longitudinal
seams, shall extend not less than 6 inches under the roof covering on
each side, and shall have a 1/2 inch fold on each side. The sheets shall
lap not less than 6 inches in the direction of flow and shall be secured
to roofing construction with cleats attached to the fold on each side.
Tops of sheets shall be nailed to roof sheathing. Cleats shall be spaced
not more than 12 inches oc. The exposed flashing shall be not less than
4 inches in width at the top and shall increase one inch in width for
each additional 8 feet in length. Where the slope of the valley is 4‑1/2
inches or less per foot, or the intersecting roofs are on different
slopes, an inverted V‑joint one inch high, shall be provided along the
centerline of the valley; and the edge of the valley sheets shall extend
8 inches under the roof covering on each side. At Contractor\'s option,
valley flashing for asphalt shingle roofs may be as specified in Section
07311 ‑ Asphalt Shingles.

R. Eave Flashing: One piece in width, applied in 8 to 10 feet lengths
with expansion joints spaced as specified in paragraph T \"Expansion
Joints\" below. The upper edge of sheet shall have a 3/4 inch continuous
fold to engage cleats spaced not more than 10 inches oc. The upper edge
of flashing shall be located not less than 18 inches from the outside
face of the building, measured along the roof slope. The lower edge
shall be folded over and loose locked into a continuous edge strip on
the fascia. Where eave flashing intersects metal valley flashing it
shall be secured with one inch flat locked joints with cleats that are
10 inches oc. Eave flashing shall be placed over underlayment and in
plastic bituminous cement as specified in Section 07311 ‑ Asphalt
Shingles.

S. Sheet Metal Coverings on Flat, Sloped or Curved Surfaces: Except as
specified or indicated otherwise, cover and flash all minor flat, sloped
or curved surfaces such as crickets, bulkheads, dormers and small decks
with metal sheets of the material used for flashing; maximum size of
sheets, 16 x 18 inches. Fasten sheets to sheathing with metal cleats.
Lock seams and solder. Provide an underlayment of building paper for all
sheet metal covering.

T. Expansion Joints: Expansion joints for roofs, walls, and floors shall
be provided where indicated, shall conform to the requirements of Table
I and be located at not more than 40 feet intervals, except that where
the distance between the last expansion joint and the end of the
continuous run is more than half the required interval spacing an
additional joint shall be provided.

1\. Roof Expansion Joints: Shall consist of curb with wood nailing
members on each side of joint, bituminous base flashing, metal
counterflashing and metal joint cover. Counterflashing shall be provided
and installed as specified in paragraph \"Counterflashing,\" except as
follows: The vertical leg of counterflashing shall be of suitable depth
to enable forming into a horizontal continuous cleat. The inner edge
shall be secured to the nailing member. The outer edge projection shall
be not less than one inch for flashing on one side of the expansion
joint and shall be less than the width of the expansion joint plus one
inch for flashing on the other side of the joint. The expansion joint
cover shall be hooked over the projecting outer edges of
counterflashing. Roof joint shall be provided with a joint cover of the
width indicated. One edge of the joint cover shall be hooked and locked
over the shorter projecting flange of the continuous cleat, and the
other edge shall be hooked over and loose‑locked with the longer
projecting flange. Joints shall be as specified in Table II.

2\. Floor and Wall Expansion Joints: Expansion joints in concrete and
masonry walls and in floor slabs shall be a U‑shape configuration with
extended flanges. Cover plates for wall and floor joints are specified
elsewhere.

U. Interface with Other Products: Metal surfaces in contact with mortar,
concrete, or other masonry materials shall be painted with
alkali‑resistant coatings such as heavy‑bodied bituminous paint.

1\. Requirements: Sheet metal work shall be field painted in addition to
that as required for the separation of dissimilar metals or for
compliance with design requirements. Painting shall be according to
Section 09915 ‑ Exterior and Interior Painting.

2\. Prior to Painting: Grease and oil films, handling marks,
contamination from steel wool, fittings and drilling debris shall be
removed, and the work scrubbed clean. All exposed metal surfaces shall
be free of dents, creases, waves, scratch marks, and solder marks. Clean
all exposed sheet metal work at completion of installation.

3.3 ADJUSTMENTS

A. Requirements: Scratches, abrasions and minor surface defects of
finish may be repaired as approved. Finish of repaired surfaces shall be
uniform and free from scratches, blemishes, and from variations of color
and surface texture.

TABLE I. SHEET METAL GAUGES

Zinc

Coated

Steel

Gauge

Building expansion joints

Cap\...\...\...\...\... 24

Flashings:

Base\...\...\...\..... 24

Cap (Counter‑flashing) 26

Eave\...\...\...\..... 24

Gravel stops and fascias:

Sheets, smooth\.... 24

Cover plates\...\...\... 24

TABLE II. SHEET METAL JOINTS

[Item]{.underline} [Zinc‑Coated Steel]{.underline} [Remarks]{.underline}

Joint cap for roof 1‑1/4 inch single lock, ‑‑

bldg. expansion joint standing seam, cleated

Flashings:

Base 1 inch flat locked, soldered Fill with joint

3 inches lap for expansion sealant. See joints Section 07920- Sealants &

Caulking (1)

Cap‑in Reglet 3 inch lap Seal groove with joint sealant asabove (2)

Reglets Butt joint Seal groove with joint sealant asabove (2)

Eave 1 inch flat locked, cleated Same as base flashing

Stepped 3 inches lap ‑‑

Valley 6 inches lap, cleated ‑‑

Pitch Pockets 1 inch soldered lap ‑‑

\(1\) Elastomeric flashing shall have 3‑inch lap with manufacturer\'s
recommended sealant.

\(2\) Polyvinylchloride type reglet shall be sealed with manufacturer\'s
recommended sealant.

[PART 4: MEASUREMENT AND PAYMENT]{.underline}

4.1 METHOD OF MEASUREMENT

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WHEN A "LUMP SUM" CONTRACT IS USED, DELETE THE TITLE PART 4: MEASUREMENT
AND PAYMENT, AND BOTH ARTICLES FROM THIS SECTION. MEASUREMENT AND
PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01009 - GENERAL
INFORMATION AND REQUIREMENTS OR SECTION 01010- SUMMARY OF WORK. WHEN NOT
A "LUMP SUM" CONTRACT, SELECT APPLICABLE PHRASES; USE THE "NO
MEASUREMENT" PHRASE WHEN NONE OF THE PAY ITEMS IN THS SECTION ARE
INCLUDED IN THE BID SCHEDULE.

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A. Units: The work described in this section will \[not be measured for
payment\]. \[be measured for and paid for\] \[on a lump-sum basis\].

4.2 BASIS OF PAYMENT

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WHEN NOT A "LUMP SUM" CONTRACT, SELECT APPLICABLE, SELECT APPLICABLE
PHRASES; USE THE "NO DIRECT PAYMENT" PHRASE WHEN NONE OF THE PAY ITEMS
IN THE SPECIFICATION ARE INCLUDED IN THE BID SCHEDULE.

WHEN NOT A "LUMP SUM" CONTRACT AND PAYMENT IS TO BE MADE UNDER THIS
SECTION, SELECT APPLICABLE PAY ITEMS. DO NOT CHANGE PAY ITEM NUMBER.
WHEN MORE THAN ONE DIAMETER OR GAUGE IS SPECIFIED FOR ANY PAY ITEM,
LETTER SUFFIXES WILL BE ADDED AFTER THE PARENTHESIS OF THE ITEM NUMBER.
WHEN GOVERNMENT-FURNISHED PROPERTY IS SPECIFIED FOR PAY ITEMS, THE
LETTER SUFFIX GF WILL BE ADDED AFTER THE PARENTHESIS OF THE ITEM NUMBER.

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A. Payment: \[No direct payment for the work described under this
section will be made. Consideration for this item shall be included in
the bid price for other items of the Contract\]. \[Prices and payment
will be full compensation for the work described in this section.
Payment will be made under:\]

END OF SECTION