Roof Joist Construction Details

The united states still uses imperial units of measurement and framing members are typically spaced sixteen or twenty four inches apart.

Roof joist construction details.

For additional stability you can also use steel joists that are built into one or both of the walls. This will give additional stability to the roof structure. Lay 10 or 12 inch tiles with 1 inch head lap on the sides of dormers. Double the tiles at eaves and project them 1 inch over the rear edge of gutters.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. End bearing with rim board. End bearing in hanger supported by i joist s 44kb. I joist construction details.

Secure each tile with two large head roofing nails. Good installation begins with specification of the correct joist for the application. End bearing with blocking panels. Lay all tiles within 1 foot of hips ridges and abutting vertical surfaces in roofer s cement.

In the uk a concrete tiled roof would normally have rafters at 600 mm 24 in centers roof battens at 300 mm 12 in centers and ceiling joists at 400 mm 16 in centers. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. End bearing in hanger supported by a beam. I joists in floor and roof applications.

Intermediate bearing with blocking panels. In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.