Roof Joist Construction Details

Good installation begins with specification of the correct joist for the application.

Roof joist construction details.

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 i joist s 44kb. Secure each tile with two large head roofing nails. Lay all tiles within 1 foot of hips ridges and abutting vertical surfaces in roofer s cement.

Double the tiles at eaves and project them 1 inch over the rear edge of gutters. I joists in floor and roof applications. 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. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.

Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes. End bearing in hanger supported by a beam. End bearing with rim joist.

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. End bearing with rim board. 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. End bearing with blocking panels. I joist construction details.