Roof Joist Construction Details

I joists in floor and roof applications.

Roof joist construction details.

Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. End bearing with blocking panels. The united states still uses imperial units of measurement and framing members are typically spaced sixteen or twenty four inches apart. Secure each tile with two large head roofing nails.

End bearing in hanger supported by a beam. End bearing in hanger on a top plate. The construction of the flat roof is similar to that of the timber upper floor. In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes.

For additional stability you can also use steel joists that are built into one or both of the walls. 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. End bearing with rim board.

This will give additional stability to the roof structure. Lay all tiles within 1 foot of hips ridges and abutting vertical surfaces in roofer s cement. Good installation begins with specification of the correct joist for the application. I joist construction details.

Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. Intermediate bearing with blocking panels. End bearing in hanger supported by i joist s 44kb.