Function Of Wall Plate In Roof

The notch is referred to as the bird s mouth and its depth should not exceed one third the depth of the rafter.

Function of wall plate in roof. This allows this type of roof structure to be used for greater spans than the couple roof. They span between the wall plate and the ridge. They are notched and nailed to a wall plate which is in turn secured to a load bearing wall usually the external cavity wall. Getting the wall plates or top plates as they are sometimes called right is important because all the ceiling joists roof rafters hips etc.

The rafters sit on a wall plate a length of timber usually 100 x 75 mm bedded on mortar on top of the wall. A wall plate or pan is a timber usually 4 by3 that sits on the inner top course of brickwork and the ceiling joists and rafters are fixed to it it can be repaired but is best done by a joiner as you will have to support your ceiling and roof timbers while you take out and replace the damaged rotten timbers the job will more than likeely cause damage to your plasterwork and decorations in. Apex highest point where the sloping top chords meet. This extra roof member helps prevent the rafters from spreading when under load.

Other load bearing timbers use the term plate but are not in the wall such as crown plate a purlin like beam carried by crown posts in roof framing and a purlin plate which supports common rafters. Cantilever part of structural member that extends beyond its support. Bearing structural support of trusses usually walls normally with a timber wall plate. A collar roof incorporates a horizontal roof member positioned approximately one third of the distance from the ridge to the wall plate line.

Cantilever strut web that joins the bottom chord above the. The wall plate provides a fixing point for the feet of the rafters and is an efficient means of spreading the load exerted by the roof structure down through the walls without creating pressure points where each rafter meets the wall. They are cut to the same length as the brickwork they sit on a half lap joint is great for the corners to be fixed to. The basic components of a roof truss.

Will all be fixed to them. The terms sole plate or sill plate are used for the members at the bottom of a wall at the foundation but are most often just called a sole or sill without the word plate.