Timber Roof Wall Plate Size

These are typically 1 2 m long with a cranked end and are fixed to the wall plate at 2 m centres.

Timber roof wall plate size. Minimum timber size will be 95mm x 35mm although this may increase for the following reasons. Additional wall insulation may increase the depth of the frame to 125mm if the wall requires more structural strength that may increase the timber thickness from 35mm to 45mm. The roof covering membrane may also require additional fixing using mechanical fasteners to prevent uplift high wind load areas. 38 x 100mm or in accordance with local practice.

Wall plates should be joined using half lapped joints at corners and in running lengths. If you have tall joists you may need to cut a splice or seat cut on the end of the joist so it doesn t protrude above the rafters. Wall plates are to be fixed to masonery using hardened nails 4mm in diameter x 75mm long or 50mm long wood screws if fixed into timber. Also called a wall plate raising plate or top plate an exception to the use of the term plate for a large load bearing timber in a wall is the bressummer a timber supporting a wall over a wall opening see also.

A plate in timber framing is a piece of timber upon which some considerable weight is framed hence ground plate window plate obsolete etc. Likewise for the trimmed joist 600mm from the outside of the wall plate. Where trussed rafter roofs are not subject to uplift a minimum of two 4 5mm x 100mm galvanized round wire nails skew nailed one on each side of the trussed rafter or truss clips fixed in accordance with the manufacturer s instructions are acceptable. In scotland 100mm x 25mm wall plates should be used in long lengths butt jointed.

Generally wall plates are in lengths of not less than 3 m. The trimmed joist will measure 600mm minus the thickness of the joist substitute 600 for 400 450 or whatever centers you are working to.