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

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 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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For the beams it is recommended to nail 2 – 2x6 boards together to make the beam and rest them on top of the post and attach with steel connectors. If the deck is going to be very low profile the beams can be mounted on the sides of the posts and attached with large bolts and/or brackets. For the joists 2x6 boards is all that is required. Spacing between the boards should follow building code and manufacturers guidelines (for composite decking).

Maximum Allowable Spans for #2 Douglas Fir-Larch1,2,3City of Medford and Jackson County Building Departments Roof, no ceiling; Low slope rafters=L/240; High slope rafters=L/180; Floors=L/360; Ceilings=L/240 (Drywall).

In order to use beam on top of joist, the deck must be at least 25" tall. Anything shorter than this and the software will switch to flush joist construction.

UnderDeck can be finished off as much as you like. Seamless gutters and downspouts are not necessary. However, most applications do utilize them.

x4 and 1x6 deck boards need to be installed on 16” centers. 5/4 x 4 and 5/4 x 6 deck boards need to be installed on 24” centers.

some point we may add other major brands to our program’s databases. But in the meantime if you size for Trus-Joist MacMIllan, competing brands (your lumber yard) should be happy to cross-reference for you.

We used to, until we found nearly all of our customers were using air nail guns. Since no two air nailers seem to take the same nail, we chose to lower our prices and let you have your choice of nailing methods. The E-Commerce area of our website features nail gun nails to fit many popular brands.

Our Decking's maximum span is 24 inches (however 16" is recommended). Joist spans should be 16 inches on center for residential applications. On long deck surfaces where plank ends are butted, double joists with 3-inch wide Snap Locks are used. Complete engineering specifications are available.