Flat Roof Wall Plate Fixing

Where a new flat roof abuts an existing external wall the joists can be hung on metal joist hangers which are fixed to a horizontal timber plate wall bolted to the wall.

Flat roof wall plate fixing.

I m having an extension built and would like to know how to properly and safely fix for example anchor bolts what size etc a wall plate to an external masonry wall so that the joist will hold a 102kg rooflight. Generally wall plates are in lengths of not less than 3 m. Fixings used to connect the roof structure to the wall plate should be specified according to the roof construction and exposure of the site. These are typically 1 2 m long with a cranked end and are fixed to the wall plate at 2 m centres.

Fixing a wall plate hi. As the mortar does not bond the wall plate to the wall steel straps are used to ensure that the roof structure remains secure. Using timber wall plates. Fixing joists to an existing wall.

Also for your wall plates fix them down about every 500mm with concrete screws and then every 1500 with plate straps. 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. A cavity closer should be provided to the top of the walls to prevent fire spread and to stop damp air entering the roof space. Creating a fall on a flat roof.

Set out the ceiling joists onto the wall plates the ceiling joists are installed before the rafters as they will stop the roof spreading and also give something for you to lay planks across to stand on when building the roof. And attaching the wall plate for it theme. By way of metal flat roof joist hangers. The plate straps at least should be in your spec also yes to the half laps.