How to position fix and align joist plates.
Fixing flat roof joists to 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.
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Fixing roof trusses to a wall plate requires a small amount of carpentry knowledge such as the abilities to read a tape measure and operate a framing square.
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.
Joist repair plates fixed to timbers.
Fixing joists to an existing wall.
Fixing a wall plate hi.
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.
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.
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.
Otherwise setting roof trusses onto wall plates can be done by the average do it yourselfer usually in one to two days depending on the size and scope of the project.
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.
