Can I Joist Be Used For Floor

This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.

Can i joist be used for floor.

Can you frame a whole house using 2x4 floor joists. Regardless of the grade of lumber used try to choose boards which have few knots or defects and that are straight with little crook along the length of the edge. You need to measure the complete span of your floor joists together with the distance between them the centres and the size of the timbers. In buildings with basements the first level of floor joists serves the same purpose.

In the past 2x4s or 2x6s were sometimes used as floor joists. This should be compared to the table. Another option might be to put plywood below the joist as well as above. Floor joists are horizontal framing members that make up the skeleton of a.

See our complete chart of floor joist size span and spacing requirements before you build. B u t information such as this can solve some sticky problems for heat duct plumbing clearances and the like in a few select areas of a custom home or remodel. True floor joist span calculations can only be made by a structural engineer or contractor. Floor joists installed on second or third or higher levels double as ceiling joists for the level below.

Lower grades of lumber designated as 3 utility and 4 often have too many large knots or other defects to be used for floor joists. By code a 2x6 is only good for walls its not even considered a floor joist by the canadian code. You don t use 2x4 s for floor joists. This would make the plywood the stressed member and the 2x4s would be acting more like the webbing of an i beam.

The only thing i would use those for in regards to a floor would be a landing for stairs and thats it. We ve included 2x6 2x8 2x10 and 2x12 joist spans and more. If your old joists do not meet the requirements set by the table they are either supported somewhere from underneath or they were installed pre regulations november 1985.