Community College of Allegheny County Pittsburgh, Pennsylvania
2022 Library Roofing Project
D. Flash all pipes with Prefabricated Flashing Boots where possible. Field fabricate pipe flashings with unreinforced flashing membrane per standard Tremco Roofing Systems details when a pre-molded flashing is not feasible. E. Fabricate all metal flanged flashings using Membrane Coated Metal. Hot air weld a 6-inch wide cover strip to flashing membrane and coated metal flange. F. Mix adhesive vigorously by hand to achieve a homogeneous blend. DO NOT use electrical equipment or open flame near adhesive. Do not thin adhesive with solvents. G. Flashing Membrane Application: 1. Install membrane flashing details per Tremco Inc. specifications, recommendations, and details drawings. 2. Apply specified bonding adhesive in full coverage to both the substrate and to the back side of the flashing membrane. 3. The base flashing membrane shall be fully adhered to a dry, smooth solvent- resistant and compatible substrate using approved bonding adhesive. 4. When the membrane has been cut to correct width and length, embed the flashing into the substrate adhesive, taking care to avoid wrinkles. 5. Apply bonding adhesive using approved solvent-resistant roller or power roller equipment. a. The adhesive shall be applied at a rate of 1-gallon per every 50 square feet. The adhesive shall be applied in a smooth even coating with no globs, puddles, voids or similar irregularities. Coverage will vary based on substrate porosity. b.
Allow adhesive to dry to a tacky feel when touched with the back side of a dry finger before bonding membrane to substrate. Drying time of the adhesive increases with the presence of higher humidity or cooler temperatures. Do not allow adhesive to fully dry prior to placing membranes. If the surface dries to the point that if no longer feels tacky, re-apply bonding adhesive and allow to flash off to the proper drying condition.
c.
6. Position membrane in intended location and fold back. Apply specified bonding adhesive in full coverage to both the substrate and the back side of the membrane. Allow adhesive to dry to a tacky feel when touched with the back side of a dry finger before bonding membrane to substrate (approximately 5 - 10 minutes.) Mate the membrane to the substrate avoiding any air entrapment, and apply pressure by means of roller to ensure complete bonding. 7. Bonding adhesive shall not be applied to lap (seam) areas that are to be welded to flashings or adjacent membrane sheets by means of hot air welding procedures. If contamination occurs, remove any contaminates prior to hot air welding seams. 8. Care should be taken to ensure that the flashing does not bridge where there is a change of direction. 9. Apply consistent pressure to entire surface of membrane using a steel hand roller to achieve full adhesion of the sheet to the flashing substrate. Ensure complete bond and continuity without wrinkles or voids.
07540-13 THERMOPLASTIC MEMBRANE ROOFING
February 2022
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