PERF-O JOIST® pre-drilled joists are made from an I-section with holes cut out at strategic points. The pre-cut holes offer more flexibility for passing air ducts, electrical wiring and plumbing. With this product, open web HYBRID JOIST blocking or 2" x 6" strongback bracing can be easily installed. It is also possible to adjust the joists to the desired length by cutting off the ends by up to 2 feet without any danger of weakening the joists.

This brand-new product is an excellent compromise for anyone who likes working with I-joists but wants more flexibility on the construction site, as well as savings and improved performance. 

pre-drilled i-joist

Advantages of this joist

  • Available in standard heights: 9-1/2", 11-7/8", 14" and 16"
  • Large 2-1/2" wide surface for nailing the subflooring 
  • Structural calculations done with specialized computer software 
  • Environmentally friendly
  • Economical and high-performance
  • Manufactured in a state-of-the-art facility
  • Made from dry lumber 
  • Quick and precise installation thanks to project-adapted cutting list 
  • Light and easy to transport
  • Will not warp or shrink
  • Easy on-site cutting
  • Silent flooring system when installed as recommended in installation guide


Inventory of lengths available for the different heights

The PERF-O JOIST® pre-drilled joists floor system is stocked in lengths from 10' to 26' and heights of 9-1/2", 11-7/8", 14" and 16" (other heights and lengths available by special order).

Please consult the following tables to find out what standard inventory lengths are available for each height:

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370 Lajeunesse W Blvd.
St-Jérôme (Québec)
J7Y 4E5

450 431 9333
[email protected]

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