Fully Adhered TPO Single Ply Membrane
on after a cool down period.
Quality Control of Seams
The roofing contractor shall check all welded seams for continuity and integrity using a rounded screwdriver, cotter pin extractor, or other suitable blunt object (probe). Any openings or "fishmouths" are to be repaired with a hand-held hot air tool fitted with a narrow nozzle tip and with a roller. Each day the contractor shall attempt to pull apart several sections of welded seams to test the quality of the welds. Should the welds be deficient, a more thorough examination of the work performed must be carried out and necessary repairs made.
TPO Coated Metal Flashing Sheets
TPO Coated Metal Flashing shall be installed in accordance with Manufacturer's
TPO Roofing Systems' Standard Details.
Complete all metalwork concurrently with roofing and flashings so that a watertight condition can be achieved each day.
TPO Coated Metal shall be installed to provide adequate resistance to bending and to allow for normal thermal expansion and contraction.
All metal joints are to be watertight and staggered over nailer joints to prevent joints in nailers anq joints in metal from lining up.
All metal flashings and terminations shall be securely fastened in the plane of the roof deck with fasteners recommended by the Manufacturer.
Fasteners used to secure flashings to wood nailers shall be stainless steel, galvanized metal or other corrosion resistant material, with a head diameter of not less than 3/8", and with fastener penetration into the wood nailer of at least 3/4".
TPO Membrane Flashings
All membrane flashings are to be installed concurrently with the roof membrane as the project progresses. Temporary flashings are not allowed without prior written approval from the Manufacturer's Warranty Department. Should any water penetrate the new roofing because of incomplete flashings, the affected areas shall be removed and replaced at the contractor's expense.
All flashings shall be hot air welded at their connections with the roofing membrane. All hand welds shall be a minimum of 1-1/2 inches wide.
Drip Apron and Gravel Stop
For drip aprons and gravel stops, the metal flange shall extend a minimum of 3 inches onto the wood nailer. The wood nailer must be wider than the metal flange. Approved screw fasteners shall be installed a maximum of 6 inches on center and W' to 3/4" from the inside edge of the metal flange. Ring shank nails spaced a maximum 4" on center may also be used.
All drip aprons and gravel stops shall primed with Manufacturer's Tape Primer and stripped with Manufacturer's Cured Cover Tape. Cleaning the metal with a solvent such as toluene or xylene to remove oil film may be required prior to installing and priming with the Tape Primer.
The edge of the Cured Cover Tape overlapping the metal flange shall be caulked with Lap Sealant. For those areas where water flows over the drip apron, both