OPEN JOIST is an engineered floor truss that takes advantage of the structural power of the triangle and the forces of compression and tension working together to create superior strength.

open-web floor truss assembled through a unique process of finger joinery and waterproof structural adhesive instead of metal plates.

OPEN JOIST uses phenol resorcinol adhesive. This structural adhesive is the standard of the engineered wood products industry (also used by I-Joist and Glu-Lam manufacturers) and has been in use since the late 1940's. It is safe to say that the wood fiber in an OPEN JOIST floor truss would disintegrate from age before this glue would break down.

Clear spans depend on truss spacing and floor loading requirements, but the maximum clear spans achievable (distance between bearings) with OPEN JOIST are:

Yes. OPEN JOIST has been approved for use by BOCA, ICBO and SBCCI code agencies. National Evaluation Service, Inc. has issued National Evaluation Report Number NER-502 for the product.

No. The superior strength and highly competitive cost make it a natural choice for many commercial construction projects. The product's strength/cost ratio makes it an attractive floor-framing system for almost any building project. an open-web floor truss, OPEN JOIST normally issues floor-system designs using the standard floor truss deflection criteria of L/360, because open-web floor joists allow the use of "strongback" bracing (see installation details).

engineered floor system layout is supplied with every shipment, along with general framing details and information for framers. Generally, a builder only has to keep in mind a few things when framing with OPEN JOIST. Leave at least 1-3/4" of the end block when trimming the end, and do not cut or notch the web area of the OPEN JOIST floor truss. For the most part, framing with OPEN JOIST is no different than framing with dimension lumber.

No. You only need a bearing of 1-1/2" in all normal loading situations; therefore, trusses can be butted together over a 2x4 intermediate bearing wall.

The assembly process for OPEN JOIST floor trusses results in some unavoidable glue runs and spills. The glue can be scraped from OPEN JOIST trusses or painted over if the trusses are to be left exposed.

Yes you can, but keep the tubing away from the fixture and insulate the tubing in proximity of the fixture and follow manufacturers instructions.

A JJI-Joist is a structurally engineered timber joist, combining high-grade softwood flanges with an engineered composite panel web. For more information please see our Product Range.

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PVC can be impact modified. CertainTeed has tailored its formulations to meet or exceed the requirements necessary for excellent performance in the field.