Installation Guide

Floor, Roof, and Wall Panel Installation
3Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | June 2019
Fastening Schedule
(1)
for Flooring
Panel
Thickness
Nail Type
Nail Spacing
At Panel
Edge
(2)
Intermediate
Supports
(3)
Single-Layer
Flooring
19
⁄32" – 1" 8d (0.131" x 2½") 6" o.c. 12" o.c.
1
1
⁄8" – 1¼" 10d (0.148" x 3") 6" o.c. 12" o.c.
Subflooring in
Double-Layer
Flooring
¾" and less
6d deformed-shank
(0.120" x 2")
6" o.c. 12" o.c.
7
⁄8" – 1" 8d (0.131" x 2½") 6" o.c. 12" o.c.
1
1
⁄8" – 1¼" 10d (0.148" x 3") 6" o.c. 12" o.c.
(1) Minimum per code. Tighter spacings may be required by the design professional of record.
(2) Nail spacing at panel edges applies to edges supported by framing members and edges at
floor perimeters.
(3) Nails must be spaced no more than 6" on-center at all supports where spans are 48"
or greater.
Special Considerations for Power-Driven
Fasteners
Pneumatic staplers and nail guns are light-
weight and do not provide enough force on
the panel to hold it tight to the framing as
it is nailed. Poor contact can cause the nail
to pop or become loose enough to squeak
against the panel later on. Avoid this by
having the operator stand on the ooring, or
apply hand pressure, next to the area being
fastened as the nail is driven.
Most power-driven fasteners have adjust-
ments for controlling pressure. If the
pressure is set too high, it will countersink
the fastener—something that should be
avoided when installing ooring or sheathing.
Adjust the pressure until the nails drive ush
to the panel face.
Expansion Joints for Floors in
Large Buildings
Dimensional changes in large buildings can
be signicant when the ooring absorbs
surrounding moisture and expands. The
installation of temporary expansion joints
can help reduce these problems.
The typical
1
⁄8" panel gaps used in smaller
structures may not be adequate for build-
ings over 80' in length or width. In these
buildings, add ¾" gaps at 80' intervals (or as
specied on the plan). Alternatively, do not
nail the ooring at double joist locations until
after the building has been dried in. After
drying-in, ll the expansion joints with a wood
ller piece or non-shrink grout.
Make sure that the wall bottom plates do not
cross expansion joints. After drying-in, splice
the bottom plate of the wall together by adding
a ller block and a doubler between the wall
studs. See Figure 4 for one framing possibility.
Subflooring
Weyerhaeuser single-layer ooring is
designed and rated for use as a combination
suboor and underlayment in single-layer
oor construction, providing cost savings and
improved oor performance over multi-layer
installations. Weyerhaeuser sheathing may
be used as a suboor in ooring applications
where two layers of sheathing are used.
Weyerhaeuser single-layer ooring is
manufactured to meet or exceed Voluntary
Product Standard PS 2.
Installing Finish Flooring
Weyerhaeuser single-layer ooring does not
require an additional underlayment beneath
a pad and carpet or hardwood ooring
nish. In all other applications such as tile,
fully adhered carpet, or sheet ooring, the
oor panels should be supplemented with
an underlayment. Check the manufacturer’s
recommendations before installing. To
ensure tight joints and smooth appearance
of the nish oor covering, be sure to glue
the T&G joints.
Allow the ooring to dry before installing
underlayment or nish ooring. Sand any
uneven areas, making sure to check the
joints thoroughly. Inspect the fasteners,
making sure they are ush, and reset any
nail pops that may have occurred during
construction. Do not ll nail holes, but do ll
and sand edge joints and any damaged
areas or gaps as necessary.
Installing Non-Load-Bearing
Partition Walls
Due to the strength and stiffness of
Weyerhaeuser ooring, a typical partition
wall can be supported anywhere along the
ooring without additional blocking when
the ooring is installed in accordance with
Wall studs, typical
Doubler
(1)
Wall bottom plate, typical
Wood structural
panel floor deck
Plate filler
block
(1)
After building is “closed in,” nail floor deck and fill
expansion joint with wood strip or non-shrink grout
(provide a
1
⁄8" gap at panel ends and edges)
3
⁄4" temporary
expansion joint
at 80' intervals
±12" gap in wall
bottom plate at
expansion joint
Figure 4
(1)
Install plate filler block and doubler to splice bottom plate after floor deck is nailed and building is “closed in.”