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Roofers Choice: Installation

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Roofers Choice Synthetic Felt must be installed above properly ventilated spaces (follow local building code), as it is considered a vapor barrier.


Roofers Choice Synthetic Felt should not be used on slopes less than 2:12 pitch.


Roofers Choice Synthetic Felt is laid horizontally (parallel) to the eave with the printed side up and with 4” horizontal and 6” vertical laps. It is recommended in high wind zones, 6” horizontal and 8” vertical laps. (The use of a slip sheet is not required underneath metal roofing.)


Roofers Choice Synthetic Felt must be attached to the structural roof deck material using plastic or steel cap roofing nails having a minimum of 1” diameter cap, spaced at 12” on vertical and 14” on horizontal. All plastic or steel caps must be attached flush with the underlayment surface and must be fastened at a 90 degree angle to the deck. Follow the nailing pattern, which is marked by X’s on the product. DO NOT USE STAPLES TO SECURE BATTENS!


For tile installations, use a pressure-sensitive double-sided tape such as 4” detail bond tape as manufactured by RoofTape LLC. Place the tape underneath the batten (parallel with the batten) to help seal any gaps between the underlayment and the battens.


Where seams or joints require sealant or adhesive, use only a high-quality, low-solvent asbestos-free plastic roofing cement meeting ASTM D-4586 Type 1 (Asbestos Free), Spec SS-153 Type 1 (Asbestos Free). In areas subject to wind-driven rain where the underlayment will be left exposed to the weather for an extended period of time, seal all seams with 4” wide detail bond double-sided reinforced tape as manufactured by RoofTape LLC, urethane, or EPDM-based caulk or tape sealant.