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Historic Preservation - Technical Procedures
Guidelines For Installing A Standing Seam Sheetmetal Roof
Us Custom House, Portland, Or - Gsa/Facil Support Center
Thermal And Moisture Protection
Sheet Metal Roofing
Guidelines For Installing A Standing Seam Sheetmetal Roof
GUIDELINES FOR INSTALLING A STANDING SEAM SHEET METAL ROOF
A. This procedure includes general guidelines for installing
standing seam sheet metal roofing and related flashing.
GENERALLY, THIS WORK SHOULD BE PERFORMED BY AND
B. This procedure may also be adapted to replacement of
damaged areas of otherwise sound standing seam metal
roofing. Replacement roofing should match original in
color, detailing and dimensioning.
C. See 01100-07-S for general project guidelines to be
reviewed along with this procedure. These guidelines
cover the following sections:
1. Safety Precautions
2. Historic Structures Precautions
4. Quality Assurance
5. Delivery, Storage and Handling
6. Project/Site Conditions
7. Sequencing and Scheduling
8. General Protection (Surface and Surrounding)
These guidelines should be reviewed prior to performing
this procedure and should be followed, when applicable,
along with recommendations from the Regional Historic
Preservation Officer (RHPO).
A. American Society for Testing and Materials (ASTM), 100
Barr Drive, West Conshohocken, PA 19428, (610) 832-9585
or FAX (610) 832-9555.
B. American National Standards Institute, Inc. (ANSI), 1430
Broadway, New York, NY 10018.
A. Product Data: Submit complete product brochures and
catalog pages showing details of installation and
assembly as well as materials, colors available, for all
proprietary metal roofing systems proposed for use.
1. List compliance with all specified qualities.
B. Shop Drawings: Provide showing all details of assembly
proposed for use.
1. Copies of SMACNA manual illustrations may be used
in lieu of shop drawings where those details will
be the ones proposed for use as specified.
2. Show roof plan and layout of all pan sections,
standing seams, flat seams, flashings, ridges, and
other details of the roofing system and their
location on the roof.
C. Materials Lists and Certificates:
1. Provide a complete list of all materials and
products proposed for use in the roofing system and
required to complete the assembly.
1.04 DELIVERY, STORAGE AND HANDLING
A. Packing and Shipping: Box, crate, palletize and wrap
materials with weatherproof covering during shipment,
handling and storage.
B. Storage and Protection:
1. Protect materials from exposure to elements and
keep dry at all times.
2. Protect against impact, abrasion, discoloration,
and other damage.
3. Replace damaged article, or refinish any damage to
original condition, before installation and
A. Provide copies of all manufacturer's guarantees of
proprietary roofing systems, materials, and installation,
duly signed and dated.
B. Include all warranty inspections by a manufacturer's
representative necessary to effect the guarantee of
material performance and its installation.
A. Sheet Metal: Zinc-Aluminum alloy coated sheet steel for
roofing and flashing, ASTM Designation A 875/A 875M:
Specification for Steel Sheet, Zinc-5% Aluminum Alloy
Metallic-Coated by the Hot Dip Process.
1. Performance and Design Requirements: Factory
prefinished zinc-aluminum alloy coated sheet steel
roofing, standing seam style per SMACNA Plates No.
120 and 121, folded seam without separate cover
B. Solder: ASTM B32-83; 50/50.
C. Soldering Flux: Type best suited for specific metal.
D. Nails & Fasteners: Use type and form of metal fastener
compatible with the base metal and support structure;
non-corroding type or hot dip galvanized.
E. Roofing Felt: Asphalt saturated felt, 15-lb. or 30-lb.
weight, unperforated; ASTM Designation, D224-81.
F. Building Paper: Rosin sized, unsaturated paper, 6-lb.
per 100-sq. ft.
G. Sealant: See 07900-02-S for guidance.
H. Bituminous Coating: Black asphaltic enamel for metal
priming and coating, a galvanic barrier.
A. Soldering Coppers: Heavy weight, 10-lb., and stove to
heat them or electric or gas heated, necessary to fully
B. Finishes: Factory applied synthetic, standard with the
manufactured system, color as selected by Architect from
standard colors, guaranteed for 12 years for durability
and resistance to fading, flaking and rust damage.
A. Remove existing roofing complete, including all flashing.
Clean out all flashing reglets in perimeter masonry so as
to facilitate the restoration of original interlocking
B. Do not proceed with the work until curb and substrate
construction, cant strips, blocking, reglets, and other
construction to receive the work is completed.
3.02 ERECTION, INSTALLATION, APPLICATION
A. Cleating: For size and spacing, see SMACNA manual.
1. Secure one end with two fasteners and fold the
cleat over the fastener heads.
2. Unless otherwise specified, use 2" wide by 3" long
cleats of the same material and thickness of metal
B. Soldering: Included only where bare sheet metal work is
employed. See 05010-07-S for soldering procedures.
1. Perform with well-heated coppers, so as to heat
thoroughly the seam and sweat the solder through
its full width.
2. Roughen edges of stainless steel and Monel with
emery cloth before soldering.
C. Flux: Use type of flux compatible with the sheet metal.
1. Remove acid flux residue by neutralizing with
ammonia or baking soda solution and rinsing with
D. Seams: Comply with SMACNA manual Plates No. 99, 120, and
121 and other plates applicable to specific
1. Standing seams - Finish not less than 1" high
unless otherwise specified.
2. Flat-lock seams - Finish not less than 3/4" wide.
3. Lap seams where soldered or sealant filled - Finish
not less than 1" wide.
4. Lap seams, not soldered - Overlap 4" unless
5. Orient seams properly for direction of water flow
to prevent leaking.
E. Dissimilar Metals: Place building paper between
dissimilar metals or paint with asphaltum paint. CAUTION:
Some bituminous roofing cements will attack copper and
terne metal. Red Rosin paper is the preferred choice for
use with these materials.
NOTE: THE USE OF ROOFING FELTS UNDER COPPER OR TERNE
METAL IS GENERALLY NOT RECOMMENDED BECAUSE THE BITUMEN IN
THE FELTS HAVE A NEGATIVE REACTION WITH THESE MATERIALS.
RED ROSIN PAPER SHOULD BE USED INSTEAD.
F. Underlayment: Apply 30 lb. roofing felt followed by a
layer of building paper to surfaces receiving metal
roofing, valleys and gutter linings; lap plies 2".
G. Flashings: Make all new flashings for perimeter and roof
penetration joints to match the original work and in
accordance with SMACNA approved details.
3.03 FIELD QUALITY CONTROL
A. Allow for expansion and contraction of sheet metal as
recommended by SMACNA.
1. Allow 1/8 in. clearance between abutting sheets
when installing them in temperatures below 50 deg.
F. (10 deg. C).
B. Maintain the integrity of underlayment asphalt and
building paper; repair torn sheets with well lapped new
paper as required.
C. Install sheet metal so it lies flat and is not buckled or
D. No exposed cut standing or projecting edges of sheet
metal, all edges to be hemmed, soldered, or flush with
E. No exposed fastenings projecting through any roofing
surface unless so detailed; cover any surface fastenings
with soldered dutchmen or metal caps.
1. No cap soldering over fastenings without a metal
cap or dutchman.
A. Wash completed sheet metal work to remove all oils,
residue of fluxes, and dirt. Clean off any excess
END OF SECTION