Timber Sizes For Floor Joists

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Timber sizes for floor joists. 1 psf lb f ft 2 47 88 n m 2. The wood boards used as floor joists generally range in size from no smaller than 2 by 4 inches to no larger than 2 by 12 inches. Proprietary strutting is to be used in accordance with manufacturers recommendations.

These include the length of the span as well as the type and grade of the lumber being used. Two by 6 inches is a joist size frequently used in both indoor floors and as deck joists. Solid timber strutting to be at least 38mm thick and be a minimum of three quarters of the joist depth.

While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. Timber joists are available from us in numerous sizes. You should check with your local building department for construction requirements in your area.

A 2x8 up to 12 feet. 2x10 to 15 feet and 2x12 to 18 feet. In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above.

Common joist spacings are 12 inches 304 8 mm 16 inches 406 4 mm and 24 inches 609 6 mm. Sawn and treated timber is one of the oldest and most widely used building materials used in the world today both within new build construction. Bci joists are specially constructed i joists with flanges made from strong versa lam laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability.

Joist span and spacing is set by your local building code. 1 ft 0 3048 m. Joist spans over 4 5m provide 2 rows of strutting at third span positions.