Roof Joist Member Thickness

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Roof joist member thickness.

For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size. The lengths and sizes of joists vary depending on the species and quality of the lumber used.

Let s consider a basic gable wood roof framing design. Here we have a wood framed gable roof. This is the distance between joist centres. Wood beam calculator american wood council website rafter and joist span faq.

For instance if your roof has a steep pitch you may be able to use 2 inch by 4 inch rafters but if your roof has a low pitch building code may require that you used 2 inch by 6 inch or 2 inch by 8 inch rafters. Trus joist tji joist specifier s guide tj 4000 july 2019. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. Fire safe construction 3 floor performance and tj pro rating 4 5 section 1.

Continuing on from part 3.