The APA Performance Rated I-Joist (PRI) is an 'I'-shaped
engineered wood structural member designed for use in
residential floor construction and flat roof applications.
The product is prefabricated using machine stress
graded lumber or laminated veneer lumber (LVL) flanges
and wood structural panel webs bonded together with
exterior adhesives.
The APA trademark signifies that the I-Joists are
manufactured to strict quality standards by a member
of Engineered Wood Systems
(EWS), a related corporation of APA.
Specifiers and builders can select and use I-Joists
from various APA EWS member manufacturers which all
use the same set of design and installation criteria.
PRIs are manufactured in accordance with PRI-400,
the US Performance Standard for APA EWS IJoists;
and carry the approval of the British
Board of Agrément (BBA).
Their allowable span is based on a deflection limited
of 1/480 of the span - a feature which results in a stiffer
floor.
PRI-400 offers product standardisation while providing
for a choice of design and construction situations. It
is easy to incorporate PRIs into your design because they
can be selected on their allowable span for uniformly
loaded floors.
