Roof Joist Construction Details

I joists in floor and roof applications.

Roof joist construction details.

I joist construction details. 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. End bearing with blocking panels. Intermediate bearing with blocking panels.

For additional stability you can also use steel joists that are built into one or both of the walls. End bearing in hanger supported by a beam. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Lay all tiles within 1 foot of hips ridges and abutting vertical surfaces in roofer s cement.

This will give additional stability to the roof structure. Good installation begins with specification of the correct joist for the application. End bearing in hanger on a top plate. The united states still uses imperial units of measurement and framing members are typically spaced sixteen or twenty four inches apart.

End bearing with rim joist. End bearing in hanger supported by i joist s 44kb. 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.

The construction of the flat roof is similar to that of the timber upper floor. Secure each tile with two large head roofing nails. Lay 10 or 12 inch tiles with 1 inch head lap on the sides of dormers.