| The Code Plus Floor The Code Plus floor, constructed with either APA RATED
STURD-I-FLOOR or APA RATED SHEATHING, provides extra strength and stability. Code Plus
floor requirements are as follows:
1. Floor Span Rating must be at least 24
oc for floor joist spacing up to 20inches o.c., and 32 oc for joists spaced 24 inches o.c.
2. Install panels with the APA Glued Floor
System(see page 30).
3. Fasten panels with 8d nails or other
code-approved fasteners spaced 12 inches on all supports. Nail size and spacing may vary
depending on span and sheathing thickness.
4. Leave a 1/8 inch space at all panel end
and edge joints to allow for panel expansions.
5. Install panels continuously over two or
more spans with the long dimension or strength axis across supports.
Sturd-I-Floor 32 oc and 48 oc
Install APA RATED STURD-I-FLOOR 48 oc or 32 oc panels over
2x joist 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, 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 supported 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, particularly 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.
APA Performance Rated Rim Board
A rim board is the wood component that fills the space
between the sill plate and bottom plate of a wall or, in second floor construction,
between the top plate and bottom plate of two wall sections. The rim board must match the
depth of the framing members between floors or between the floor and foundation to
function properly. IN addition to supporting the wall loads, the rim board ties the floor
joists together. It is an integral component in an engineered wood system because it
transfers both lateral and vertical bearing forces.
While lumber has been the traditional product used for rim
boards, it is not compatible with the new generation of wood I-joists used in floor
construction. With the increasing use of wood I-joists, a demand for compatible engineered
wood rim boards has resulted.
APA Performance Rated Rim Boards can be manufactured using
plywood, oriented strand board (OSB), glued laminated timber (glulam), or laminated veneer
lumber (LVL). These engineered wood rim boards have less shrinkage than lumber and match
the depth of wood I-joists and other engineered wood framing products. They are available
in lengths up to 24 feet, depending on the product used.
Most APA Performance Rated Rim Boards are wood structural
panels that are manufactured in accordance with the Performance Standard for APA EWS Rim
Boards and Voluntary Product Standards PS 1 or PS 2, or APA Standard PRP-108. Glulam rim
boards are a resawn grade of glued laminated timber manufactured in accordance with the Performance
Standard for APA EWS Rim Boards and ANSI A190.1. The Performance Standard
for APA EWS Rim Boards meets or exceeds the requirements given in the ICBO ES
Acceptance Criteria for Wood-Based Rim Board Products.
As glued engineered wood products, APA Rim Boards have
greater dimensional stability, higher strength, increased structural reliability, more
consistent quality and a lower tendency to check or split than sawn lumber. |
