Installation Guide

6060 Boat Rock Blvd SW, Suite 800, Atlanta, GA 30336 USA | Toll Free: 1.855.774.0002 Phone: [phone] Fax: [phone] | dassoXTR.com
Version: June 20, 2018 3:25 PM | Page 1 of 4
Recommended Products for Use with dassoXTR
Material Application
Spacing
A space between each row of boards is recommended;
whether that spacing is achieved using a hidden fastening
clip system which automatically provides the 1/8",3/16,1/4"
or 5/16 space between boards or inserting temporary
spacers while face screwing the boards to the joists.
This spacing requirement is a standard decking installation
practice to allow for air circulation and room for expansion
and contraction caused by the weather.
Joist Span
Residential and Light Commercial — If you install all joints
atop joists (the traditional installation practice) XTR decking
can be installed 24" on center. Otherwise, the recommended
maximum span for 20mm (1x6) dassoXTR is 16" on center
—
but your local building codes may be less. Because dassoXTR
is end matched there is no need to have all joints join atop
joists. XTR end joints can meet or “fall between” the joists,
and independent testing proves this installation practice
equals or outperforms other type decking that requires all
end joints to end atop a joist (per test ASTM D0732).
When decking installation is on an angle, the joist spacing
should be 12" centers. Determine the final joist spacing only
after talking with local building code officials.
Heavy Commercial — the recommended span for heavy
commercial grade 40mm (2x6) dassoXTR is 12", 16", 18", 24"
or 36" center to center for non-vehicle traffic if the area’s
length or width is wider than 6 feet for applications such as
Marinas, Boardwalks or Piers.
NOTE: Your local building codes may span less.
NOTE: In Heavy Commercial applications with utility carts
less than 1,200 Ibs running on decks, a max span of 24" is
recommended. Joint must land on joist. In addition, deck
frame must be designed to support the expected load (such as
vehicles)
— XTR will not compensate for insufficient load bearing
structural design.
Ventilation
The deck should be built to meet or exceed your local
building code
— and joist bottoms hang at least 6" above the
ground
—l ess than that will void the warranty. There must
be adequate air circulation underneath the deck to prevent
cupping and warping of the boards.
In applications where the deck is being built closer to the
ground, a vapor barrier is recommended to prevent water
from absorbing into the underside of the material.
NOTE: For roof decks and applications above concrete, extra
spacing requirements to address ground-generated moisture
does not apply.
Hidden Fasteners
Side grooved dassoXTR is built for a hidden fastener application;
the boards are run with a continuous side groove designed for
easy installation. Although the groove is cut in accordance with
most manufactured fasteners, we recommend using the Tiger
Claw
®
clip system and following their instructions.
Hidden Fasteners are used in combination with face
screws or counter sinking plug systems. They are used for
the starter row and ending row, as well as the stair steps,
when ensuring tight hold is crucial. They are also used on
every row at the starting position and ending position, with
minimum 2” (50mm) away from the butt end.
Face Screwing and Counter Sinking
Top-down screwing is a widely accepted and common method
to install decking. XTR decking can be installed with:
1. Use a minimum of 2 ¼" length screws on ¾" thick (1x6)
decking and at least 2 ½" screws on 1-1/2" thick (2x6)
decking. Screws should be 305 grade stainless steel, and
preferably 316 grade stainless steel (316 grade is required
near water).
2. If you are counter sinking the screw heads, use the EISEN
®
D-PLUG SYSTEM, a complete system for plugging dassoXTR
planks. It includes D-Plugs for use with dassoXTR, stainless
steel screws, and a driver bit. The counter sink drill bit and
glue can be purchased seperately.
Number of Screws or Fasteners Needed
Assuming joists are 16" on center approximately 350 screws are
needed for each 100 square feet (9 square meters) of decking.
Each joist should have a minimum of two screws through EACH
board—do not face screw or countersink when joints meet
atop joists. Distance screw holes 2" (50mm) from any butt
ends to avoid end cracks and checks due to expansion and
contraction. Using the Tiger Claw
®
TC-120 system, 90 piece kit
covers 50 square feet of 5.5" wide decking.
Screw Material and Type
Always use stainless steel screws for hardwoods. Standard
head-coated in G
rade 305 stainless steel provide corrosion
resistance. For locations close to or on the water, especially
saltwater, Grade 316 stainless steel will provide even
greater corrosion resistance and should be used.
End Sealer
Use cross cut end sealer as part of the normal installation
production to help prevent splitting and checking at the ends
of the boards. We recommend that all boards be end sealed
as soon as reasonably possible after cutting, using a clear,
water-resistant wax. Anchorseal from UC Co
atings is one of
the most well-known end sealer products, although there are
others available.
NOTE: Fai
lure to end seal the boards at the time of installation
will void any claims made against the warranty.
Finishing
Although dassoXTR is a manufactured product, its primary
component is bamboo. dassoXTR will behave like a natural
building material, and therefore, in order to maintain
its original color you must either coat dassoXTR shortly
after installation with a penetrating oil finish, or, if using a
synthetic
oil after an initial period of allowing it exposure
to weather because dassoXTR fused bamboo’s factory
coat of Pre-Primed penetrating oil wears off shortly after
installation. The timeframe of this initial period varies with
the amount of weather and foot traffic. See dassoXTR.com
for guidance on when to finish dassoXTR Fused Bamboo.
NOTE: Refer to fastener for build in spacer. Different fastener
provides different spacing gaps.