This is a long video but it will show you how to do it.
Fixing flat roof joists.
Code of practice for permissible stress design materials and workmanship and bs 5268 7 2 1989 structural use of timber section 7 2.
If extra weight is the problem additional joists or rafters can be added to shore.
And tie it into your hip roof.
Make sure you offset yo.
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.
While it is not entirely impossible to take on a diy roof joist repair replacing or repairing a damaged roof joist is a complicated procedure that requires precision.
Repairing roof joists yourself.
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.
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.
This is a completion video of a flat roof framing.
How to remove repair and install a flat roof.
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.
When it comes to flat roof repair options simple patch repairs for flat roofs such as those on garages or extensions can cost a few hundred pounds.
Rotten roof joists are a severe problem and commonly lead to underlying issues and damage to opposing structures.
This is a completion video of a flat roof framing.