Technical Specifications
P. 4
Selecting a P3 JOIST
Product Description
The P3 Joist is an ”I”-shaped engineered wood structural member designed for use in residential and non-
residential floor and roof construction� P3 Joist are prefabricated using SPF MSR lumber flanges and OSB web,
which are bonded together with exterior-type adhesives� P3 Joist arelimited to a L/480 maximum live load
deflection for residential and non-residential floor applications� P3 Joist are identified by their depth followed by
their series name PJI, and by a designation such as 40 which relates to the joist strength and stiffness� P3 Joist
are manufactured to strict tolerances with the following characteristics�
• Flanges are MSR 2x3’s and 2x4’s�
• Webs are OSB, and all are classified as Exposure 1 or Exterior and are 3/8” in thickness or greater�
• All P3 Joist are assembled using exterior-type adhesives that meet ASTM D 2559 and ASTM D 7247�
• P3 Joist are available in eight depths: 9-1/2”, 11-7/8”, 14”, 16”, 18”, 20”, 22” and 24”�
• P3 Joist of the same depth are manufactured with various flange widths; flange width is an important design
consideration when specifying hangers�
• P3 Joist are manufactured up to 64’ in length� These lengths are cut to commonly used lengths such as 16’to
36’ in 2’ increments for jobsite delivery� Check local supplier foravailability�
Fire-Resistance-Rated Construction
The APA System Report SR-405D, ”Fire Protection of Floors Constructed with Prefabricated Wood I-Joists for
Compliance with the International Residential Codes,” provides seven fire protective membrane alternatives�
These assemblies in SR-405D meet the exemption in R501�3 stating, ”or other approved floor assemblies
demonstrating equivalent fire performance�” The purpose of this document is for fire protection of floors
constructed with prefabricated I-Joists when the 2012 IRC Section R501�3 or 2015 IRC Section R302�13
requirements are adopted by the local code jurisdictions�
For Fire-Resistance ratings, typical Sound Transmission Class (STC), and typical Impact Insulation Class (IIC)
refer to ICC ESR 1405 Section 4�2�2 or DCA 3 – Fire Rated Wood Floor and Wall Assemblies at www�awc�org�
P
JI 40
2-1/2”
9-1/2”,
11-7/8”,
14” or 16”
PJI 60
2-1/2”
9-1/2”,
11-7/8”,
14” or 16”
PJI 80 & 90
3-1/2”
11-7/8”,
14”, 16”, 18”, 20”, 22”, or 24”