I-Joist

A High-Performance Advantage

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I-Joist Basics

I-joists are strong, lightweight, "I" shaped engineered wood structural members designed to meet demanding performance standards. These structural members consist of top and bottom flanges that resist bending, connected by webs that provide exceptional shear resistance. The flanges are usually made of laminated veneer lumber (LVL) or solid sawn lumber, while the web is constructed from plywood or OSB. This robust combination of materials creates a versatile and economical framing solution that is easy to install in both residential and light commercial projects.

Common I-Joist Applications

I-joists are widely used in residential floor and roof framing. They are particularly suited for long spans, including continuous spans over intermediate supports. Their straight and true design simplifies the construction process, helping builders avoid crowning and maintain a level framing surface. Additionally, wood I-joists are commonly stocked and readily available in various depths tailored to residential framing needs.

Common Depths

Standard depths include 9-1/2", 11-7/8", 14", and 16". Flange widths can range from 1-1/2" to 3-1/2", and long lengths are readily available.

Common Uses

I-joists are favored for both floor and roof framing. Many APA member manufacturers offer software design tools to aid in the design process; for additional information, contact the manufacturer listed on the right.

APA PRI-400

APA Performance Rated I-joists (PRIs) are produced in accordance with APA PRI-400, which is the Performance Standard for Residential I-joists. This standard provides an easy-to-use table of allowable spans specifically for residential floor construction. It enables designers and builders to select I-joists from various manufacturers using a single set of span tables. APA PRIs are recognized through ICC-ES ESR.

The APA Mark of Quality

APA trademarks appear solely on products manufactured by APA member mills. This mark guarantees that product quality is verified via an auditing procedure designed to ensure compliance with APA performance standards or the specific standard indicated on the mark.

I-Joist Publications

These publications cover span ratings, installation guidelines, cantilever designs, architectural specifications, and engineering design properties for APA Performance Rated I-Joists.

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Resource Library

Access a complete list of APA publications related to I-joists in APA's Resource Library.

Fire Protective Assemblies for Wood I-Joist Floors

Explore several options that enhance the fire performance of I-joist floor systems while ensuring compliance with the International Residential Code (IRC) by visiting the I-Joist Fire Assemblies page.

Technical Topics TT-015: Wood I-Joist Floors, Firefighters and Fire

This discussion addresses the durability and safety of wood I-joist floor assemblies during structure fires. It includes APA's recommendations for enhancing the fire endurance of all floor-joist assemblies based on the International Building Code.

Technical Topics TT-126: Applicability Of APA Trademarks On Engineered Wood Products Surface-Coated With Fire Protective Coatings

This document contains Q&A concerning fire protective coatings. Note that certification and inspection of products treated with fire-protective coatings are outside the scope of APA.

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White Paper: Basis of IRC Membrane Protection Provisions

APA, AWC, and WIJMA jointly developed this paper detailing the history, background, and intent of IRC provisions aimed at the fire protection of floors, alongside methods for establishing equivalence and compliance with these requirements.

White Paper: Code Requirements for Prefabricated Wood I-Joists

This paper outlines the fundamental code recognition for prefabricated wood I-joists and the necessity for product certification in accordance with established codes.

White Paper: Fire Protection of I-Joist Floors with Factory-Applied Solutions

APA has developed this document to describe the essential fire protection criteria for prefabricated wood I-joists that utilize factory-applied fire protection solutions to ensure compliance with relevant codes.

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