Shed Roof Joist Size

Hi i have a large brick built shed in the garden with an osb felt flat roof with exposed rafters below.

Shed roof joist size.

Rafter and joist span faq. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. In addition this calculator will also allow you to calculate the total number of floor joist needed to complete your shed based on the measurements you provide. More roof calculators roof truss calculator.

To size joists and rafters use the maximum span tables for southern yellow pine. This demo version is fixed at 1m clear span. 1 enter joist details 1 1 span and joist spacing. How best to insulate a flat roof of a brick built shed.

Code of practice for permissible stress design materials and workmanship and bs 5268 7 2 1989 structural use of timber section 7 2. Enter a specific joist size 2 loadings dead load. The full version allows any size. The lengths and sizes of joists vary depending on the species and quality of the lumber used.

It is always better to have a large rafter rather than be concerned with a sagging roof. To start with here s a great calculator that can calculate the joist spacing based on species of wood joist size and joist spacing. Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.

Opening up the roof space roof joists. Room size is 3m x 3 5m we wish to remove the ceiling to open up the space roof joists are 2x4 50mmx90mm spaced at 1. Boarding to be fastened on top of flat roof joists with a depth to width ratio greater than 4 the allowable clear spans have been calculated in accordance with bs 5268 2 2002 structural use of timber part 2. This rafter span calculator is species specific for douglas fir hemlock etc.

This is based upon the span of the rafter horizontal span not total rafter length live and dead loads. Flat roof joist calculator.