Installation Guide

Floor Construction
ENGINEERED WOOD CONSTRUCTION GUIDE
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FORM NO. E30V
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© 2011 APA – THE ENGINEERED WOOD ASSOCIATION
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WWW.APAWOOD.ORG
34
Sturd-I-Floor 32 oc and 48 oc
Install APA RATED STURD-I-
FLOOR 48 oc or 32 oc panels
over 2x joists or I-joists spaced
32 inches on center (Figure 2).
Install APA RATED STURD-I-
FLOOR 48 oc over 4x girders
48 inches on center (Figure 3).
For the 48 oc method, supports
may be 2x joists spiked together,
4x lumber, glued laminated tim-
ber (glulams), lightweight steel
beams, or wood I-joists or floor
trusses. Girders of doubled 2x
members should have top edges
flush to permit smooth panel
end joints.
For a low profile with supports
48 inches on center, beams can
be set in foundation pockets or
on posts sup ported by footings
so that panels bear directly on
the sill. If 4x lumber girders are
used, they should be air dried
and/or set higher than the sill
to allow for shrinkage.
In some applications, partic-
ularly in hallways and other
heavy traffic areas, greater
stiffness in the floor may be
desirable. Modifications to the
48-inch framing system, such as
addition of straight or diagonal
blocking, will increase stiffness
considerably.
Stagger end joints
APA RATED STURD-I-FLOOR
32 oc or 48 oc
2x rim joist
or APA Rim
Board
1/8" spacing is
recommended at all edge
and end joints unless otherwise
indicated by panel manufacturer
Tongue-and-
groove joints
(or block edges)
Joists 32" o.c.
(2x10s typical)
Notes:
1. Provide
adequate
moisture control
and use ground
cover vapor
retarder in crawl
space. Panels must
be dry before applying
finish floor.
2. For buildings with wood or steel
framed walls, provide 3/4" temporary
expansion joints with separate floor framing
members and discontinuous wall plates over the
joints, at intervals that limit continuous floor areas to
80 feet maximum in length or width, to allow for accumulated
expansion during construction in wet weather conditions.
Refer to APA Technical Note: Temporary Expansion Joints
for Large Buildings, Form U425, for detailed information.
Center girder
2x treated
sill
Framing anchors
(or 2x2 ledger)
FIGURE 2
APA RATED STURD-I-FLOOR 32 oc AND 48 oc
(Over Supports 32" o.c.)
Strength axis
APA RATED
STURD-I-FLOOR 48 oc
2x rim joist or
APA Rim Board
1/8" spacing is
recommended at all edge
and end joints unless
otherwise indicated by
panel manufacturer
Tongue-and-groove
joints (or block edges)
4x girder
(or double 2x
connected together)
2x treated
sill
4x4 post
12" min.
FIGURE 3
APA RATED STURD-I-FLOOR 48 oc
(Over Supports 48" o.c.)
Strength axis
Notes:
1. Provide
adequate
moisture control
and use ground
cover vapor retarder
in crawl space. Panels
must be dry before applying
finish floor.
2. For buildings with wood or steel
framed walls, provide 3/4" temporary
expansion joints with separate floor framing
members and discontinuous wall plates over the
joints, at intervals that limit continuous floor areas to 80
feet maximum in length or width, to allow for accumulated
expansion during construction in wet weather conditions. Refer
to APA Technical Note: Temporary Expansion for Large Buildings,
Form U425, for detailed information.