Wood I-Joists (ZD)


Specification Details

8.5" x 11"
Word Doc
Usage Limit
Unlimited Projects
06 17 33
Provided By

Path Get Instant access

This specification is available for purchase in the following bundles:

Comprehensite SpecsStructural Specs

Wood I-Joists

Use this 3 part specification template to specify pre-engineered, prefabricated, wood I-joists for floor and roof framing.

What is it?


  • These I-joists are designed and manufactured in a controlled factory setting, ensuring precise engineering and consistent quality.
  • The engineering process involves determining the load-bearing capacity and structural integrity of the I-joists based on specific design requirements.


  • They are assembled off-site in the factory, which means they arrive at the construction site ready for installation.
  • This prefabrication process saves time and labor during the construction phase.

Wood I-Joists:

  • I-joists are engineered wood products made by combining a vertical web (the “I” shape) with horizontal flanges at the top and bottom.
  • They are typically composed of laminated veneer lumber (LVL) or oriented strand board (OSB) for the flanges, and an OSB or plywood web.

Floor and Roof Framing:

  • They are used extensively for both floor and roof systems in buildings.
  • For floors, they provide a strong, level, and stable platform for the flooring material.
  • For roofs, they serve as rafters or trusses to support the roof structure and provide a solid base for roofing materials.


  • Strength and Efficiency: I-joists are engineered for optimal strength-to-weight ratios, allowing for longer spans and reduced material usage.
  • Consistency: Manufactured in a controlled environment, they have consistent dimensions and properties, ensuring uniform performance.
  • Versatility: They can be tailored to fit various design requirements, making them suitable for a wide range of building types and styles.
  • Less Waste: Prefabrication minimizes on-site waste compared to traditional framing methods.
  • Applications: They are commonly used in residential, commercial, and industrial buildings, where efficient and reliable framing systems are crucial.


Industry Association:



Recommended Manufacturers:

roseburg framing and sheating logo


Related specification templates:



Wood I-Joists

Industry Resources
4 specs