| APA PERFORMANCE RATED RIM BOARDS |
|
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 l-joists used in
floor construction. With the increasing use of wood l-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 l-joists and either 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
structural-use panels that arc 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 A 190.1. The Performance Standard for APA EWS Rim Boards meets or
exceeds the requirements given in the lCBO 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.
 |
| In this application, an
engineered wood rim board is installed between the foundation sill plate and the floor
under a wall section. The rim board matches the depth of the I-joists used in the floor
framing. |
A P A
The Engineered Wood Association |
