Fixing Flat Roof Joists

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.

Fixing flat roof joists.

If extra weight is the problem additional joists or rafters can be added to shore. Rotten roof joists are a severe problem and commonly lead to underlying issues and damage to opposing structures. Code of practice for permissible stress design materials and workmanship and bs 5268 7 2 1989 structural use of timber section 7 2. 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.

And tie it into your hip roof. How to remove repair and install a flat roof. This is a completion video of a flat roof framing. 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.

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. 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. Boarding to be fastened on top of flat roof joists with a depth to width ratio greater than 4 the allowable clear spans have been calculated in accordance with bs 5268 2 2002 structural use of timber part 2. This is a completion video of a flat roof framing.

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. This is a long video but it will show you how to do it. Make sure you offset yo.