Attic Joist Span

It is safe to say though that 2x6 ceiling joists spaced every 24 inches on center a typical arrangement found in attics will not support live loads for a bedroom office or bathroom.

Attic joist span.

Span calculator for wood joists and rafters also available for the android os. For example the highlighted cell below shows that a 2 x 6 southern yellow pine joist with a grade of 2 and spaced 24 apart can have a maximum span of 10 feet 0 inches 10 0 if you are designing your structure to support a plaster ceiling. As mentioned above the span tables within the code list the allowable ceiling joist spans for common lumber sizes based on what design load scenario is applied. 1 inch 25 4 mm 1 foot 304 8 mm 1 pound per square foot 0 0479kpa.

So span length and width between the spans can be determined only by calculations. Ceiling joist span tables. For uninhabitable attics without storage we will use table r802 4 1 and for uninhabitable attic with limited storage we will use table r802 4 2. Now lets take a look at those tables.

True floor joist span calculations can only be made by a structural engineer or contractor. Also available for the android os. Ceiling joist spans for common lumber species uninhabitable attics with limited storage live load 20 psf l δ 240 check sources for availability of lumber in lengths greater than 20 feet.