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.
FRAMING AND FASTENING TIPS
In most cases, install fasteners at a 90° angle (perpendicular to the board).
FASTENING TIP FOR TREX SIGNATURE® NOTE: When using pneumatic or battery-operated equip- ment, adjust the pressure so that you only shoot the head of the screw to be flush with the board’s cap. DO NOT shoot the fastener head completely through the shell.
NOTE: English measurements are shown. Convert to metric measurements if necessary.
3/16" (All Temps)
CLEAN CUT BOARDS
At board ends on the deck's edge, you can install screws placed perpendicularly at the recommended distance, at minimum of 1" (25mm) from the board end and edge, without splitting the board. For butt joints, where boards meet over a single joist, add a 2" x 4" "nailer" board at the butt joint. This allows screw-in at 90 degrees and allows fasteners to be used at end of each board.
1/8" (>40°F) 3/16" (<40°F)
3/16" (5mm)
It is recommended that boards be clean cut on both ends a minimum of 3/16" (5mm). Ensure board ends are cut square. Composite decking is a great alternative to traditional wood decking. When building your deck and railing, it is recommended that code-approved structural material be used as the framing and joists. Check your local building codes for restrictions. Trex decking cannot be used for structural applications. Do not attach Trex decking directly to any solid surface or watertight system.
1/4" (>40°F) 1/2" (<40°F)
DOCK APPLICATIONS Trex decking contains no materials that will harm marine life and is safe for the environment. As long as dock is in intermittent contact with water, i.e., splashing and not in continuous direct contact with water, the durability of the Trex decking should not be affected. For docks, a 3/8" (10mm) width-to-width gap between boards is recommended to allow for increased drainage due to increased contact with water. In addition, stainless steel fasteners should be used. If there is sufficient contact between the dock and gasoline, grounding of the dock is also recommended.
1/2" Max. Overhang
Min. 1-1/2"
Min. 1-1/2"
Residential = 16" Commercial = 12"
recommends the use of Trex Universal Hidden Fasteners or 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. For 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 screws. » Always consult your local building code authority for proper details on roof and railing installation to the roof structure if required. » A ny deviation from these recommendations could result in voiding of the Trex warranty.
» It is recommended that building-code approved structural material be used as the supports. » T his system should not be allowed to float. It must be attached in a manner that secures the framing/system. » T he 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. » T rex, 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. » F or 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.) » F or 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
Special Patterns When planning a unique pattern, you will need to adjust the framing to support the surface pattern. Many decks are designed to take advantage of angles, as shown below.
Picture Frame Pattern
Breaker Board Single Joist
Breaker Board Double Joist
Herringbone Pattern
11
10
NOTE: Construction methods are always improving. Please refer to www.trex.com for the most up-to-date installation requirements.
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