Installation Guide

Page 6
TimberTech
®
Square Shouldered Boards
Important Information
Square Shouldered Board Installation
Instructions
Directional Notch
Maximum Joist Spacing
To get information on other TimberTech products, visit
timbertech.com or ask your dealer for these installation guides:
• TimberTech boards are intended to be installed em
bossed side up. The unembossed surface is not to
be used as a walking surface. This applies to all decking
surfaces.
• In areas with obstructed airflow such as roofs and
on-grade applications, a minimum of 1-1/2” sleeper sys
tem supported by and connected to the substructure over
which the deck is built is required.
• To aid water run-off, the deck should slope 1/2” for every
8’away from the house.
• To further minimize expansion and contraction, proper
ventilation and airflow should be considered.
• For best practices in climates with extreme temperature
cycles, limiting the length of the deck board and avoiding
affixing to the rigid length of the joist in applications such
as picture framing or parting boards can help avoid
movement and screw shear.
• Always be sure to check and cut the factory cut ends of
all boards to ensure they are square.
• Install from the outside edge of the deck and work
toward the house.
• Fasten no closer than 3/4” from the outside edge of each
board,using two screws per joist including end joints.
• For gapping requirements, see page 3.
• The ends of the boards must fall on a joist. Always dou
ble joists at butt seams. Do not toe screw deck boards as
this will cause splitting.
• Always install fasteners perpendicular to board surface
and drive flush. Do not overdrive or splitting and mush
rooming will occur.
• Pre-drilling is required when within 1-1/2” of the ends
of the board and for temperatures below 45 degrees
Fahrenheit to avoid end splitting and screw shear.
• TimberTech Cortex requires pre-drilling with a 7/32” bit
for ALL applications in TimberTech PRO Reserve, PRO
Legacy, and EDGE Premier
• If installed without proper 7/32” Pre-drill,
mushrooming will occur. Cortex or TOPLoc
fasteners are recommended for best results.
• On-grade decks must have additional provisions for
drainage beneath the deck structure.
• For best practices, decking should not be installed
in applications where ventilation and airflow cannot
be achieved.
Special conditions will require an engineering inspection and/or
reduced spans. Always consult local building codes.
90° Angle 30° Angle 45° Angle
100psf
16" 14"
12"
TimberTech PRO, TimberTech EDGE, and Reliaboard
3/4”
3/4”
ReliaBoard
The surfaces of these products are directional in manner. A notch has
been added to one side of the boards. When installing boards, this
marked edge must be laid to the same side for the entire installation
for a consistent appearance.
Identification
Mark
l
Bevel
Bevel
TimberTech PRO
™
, TimberTech EDGE
™
, ReliaBoard
®