Fixing joists to an existing wall.
Fixing flat roof joists to wall plate.
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.
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.
The best way to repair the end of a joist is to remove the damp or affected end after the floor or ceiling has been propped up as one would if removing or forming an opening through a load bearing wall with acrow props.
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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.
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.
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.
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.
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.
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.
A new piece of timber is cut a to replace the damaged piece and the joists plates are.
Joist repair plates fixed to timbers.
Stainless steel brackets stainless steel fixings steel strapping heavy duty joist hangers and square plate washers.
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.
How to position fix and align joist plates.
