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30
DECKING
ROOFTOP AND SLEEPER DECK SYSTEMS
NOTE: Construction methods are always improving. Please refer to www.trex.com for the most up-to-date installation requirements.
» It is recommended that building code approved
structural material be used as the supports.
» Gapping rules are required when installing Trex
decking:
TYPE OF GAP
Above 40°F
(4.5°C)
Below 40°F
(4.5°C)
Width-to-Width 1/4" (6 mm) 3/8" (10 mm)
End-to-End 1/8" (3 mm) 3/16" (5 mm)
End-to-Width 1/8" (3 mm) 3/16" (5 mm)
Abutting Solid Objects 1/4" (6 mm) 1/2" (13 mm)
» This system should not be allowed to fl oat; 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 and if using in
a roofi ng 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 it is recommended
to consult local building code offi cial for specifi c
requirements.
» If installing decking at 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 little 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 recommended 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.
» Any deviation from these recommendations could
result in the voiding of the Trex warranty.
A sleeper system is a substructure between a solid surface and Trex decking. Drainage, access, and airfl ow are
critical. Water must be able to fl ow through and away from the deck. For repairs and removal of debris, joist system
access may be necessary.
Solid Wall
Attach sleeper/bearer
joists to stable substructure
(i.e. wall and/or concrete
Gap decking width-to-width 1/4" (6 mm)–3/8" (10 mm)
depending on temperature at installation
(See note below for more information.)
Code-approved bearer substructure
Minimum 1- 1/2" (38 mm) thick and
1- 1/2" (38 mm) in height
(See note below for more information.)
Gap decking from solid object (i.e. wall)
1/4"–1/2" (6–13 mm) depending
on temperature at installation
(See note below for more information.)
Trex Decking
Where Trex decking is end-to-end and meets at a joist,
add a “nailer or sister joist” at the butt joint of the decking.
This will allow ends of each board to rest on a seperate
joist and be attached properly.
Flat level surface (i.e. concrete)
DO NOT ATTACH to unstable
substructure such as concrete
blocks or pavers setting in gravel,
sand, dirt, etc.
Residential = No greater than 16" (407 mm) on center
Commercial = No greater than 12" (305 mm) on center
(See note below for more information.)
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