Rooftop and Sleeper Deck Systems – Pressure-Treated Framing
A sleeper system is a substructure between a solid surface and Trex ® decking. Drainage, access, and airflow are critical. Water must be able to flow through and away from the deck. For repairs and removal of debris, joist system access may be necessary.
NOTE: English measurements are shown. Convert to metric measurements if necessary.
3/16" (All Temps)
1/8" (>40°F) 3/16" (<40°F)
1/4" (>40°F) 1/2" (<40°F)
3/4" Max. Overhang
Min. 1-1/2"
Min. 1-1/2"
Residential = 16" Commercial = 12"
» It is recommended that building-code approved structural material be used as the supports. » This system should not be allowed to float. It must be attached in a manner that secures the framing/system. » The sleeper system must be level and have no uneven undulations. Any uneven areas of the substructure will transfer to the Trex decking, resulting in uneven decking. » Trex ® , when used with a sleeper system, must be supported below its entire length. If using in a roofing application, the supports must run the direction of the pitch of the roof to facilitate proper drainage. Sleeper should be placed perpendicular to the deck board orientation. » For commercial applications, consult a local building code official for specific requirements. » If installing decking at an angle, decrease spans 4" (100 mm) for each of the above. (12" (305 mm) for residential and 8" (204 mm) for commercial.)
» For sleeper systems where small debris (pine needles, leaves, sand, dirt) can accumulate either between or under deck boards, a minimum of 1-1/2" (38mm) height is allowable. Trex recommends the use of Trex ® Universal Hidden Fasteners. Trex also approves the use of 2" Starborn Cap-Tor ® xd - Epoxy Coated screws. NOTE: Trex ® recommended composite decking screws are too long when using 1-1/2" (38 mm) height as this will penetrate through the sleeper. » F or areas with the potential for debris buildup, a minimum 3-1/2" (89 mm) or greater height is recommended to allow the debris to be removed along with the use of either Trex ® Universal Hidden fasteners or any Trex ® recommended or approved screws. » Always consult your local building code authority for proper details on roof and railing installation to the roof structure if required. » Any deviation from these recommendations could result in voiding of the Trex ® warranty.
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