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.
Flat roof wall plate fixing.
The plate straps at least should be in your spec also yes to the half laps.
If the wall plate of the flat roof is level with the wall plate of the existing house can you make the two wall plates the same height then you will need to strip off some roof tiles and run the new joists through butting and fixing them up to either the roof rafter or the ceiling joist on top of the house wall plate.
And attaching the wall plate for it theme.
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.
Fixings used to connect the roof structure to the wall plate should be specified according to the roof construction and exposure of the site.
Using timber wall plates.
This article covers all manner of flat roofing venting methods and details on how to build a flat garage roof and how to frame a flat roof and also encompasses flat roofs roof decking roof coverings including flat roof felt how to prevent leaks at abutments timber flat roof construction details and parapets and common.
Creating a fall on a flat roof.
Also for your wall plates fix them down about every 500mm with concrete screws and then every 1500 with plate straps.
As the mortar does not bond the wall plate to the wall steel straps are used to ensure that the roof structure remains secure.
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.
Fixing joists to an existing wall.
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.
Generally wall plates are in lengths of not less than 3 m.
To fix the joists and rafters down on to the wall plates they should be toe or skew nailed to the top plate like below.
These are typically 1 2 m long with a cranked end and are fixed to the wall plate at 2 m centres.
