Timber Kit

Deladuro

Anyone know anything about building a Timber Kit extension.
I'm trying to get my head around the dimensions involved.

If the extension is externally 3.2m wide, what is the internal width/floorspace likely to be once timber kit, insulation and plasterboard added (and any other bits).

capeverde

most building officers nowadays spec a 100mm cavity as apposed to 50mm, so given an external dimension of 3200mm, your inside space would be -300mm per wall or 2600mm in total minus plasterboard and skim which would be another inch in total. (walls being 100mm each skin)

System

never seen a 100mm cavity with timber frame, always tend to use 50 for timber and 100mm for masonry,

normal wall build up at the moment would be 19mm render, 100mm block, 50mm cavity, 9mm ply, 140mm timber kit, 12.5mm wall board

140mm kit purely to get insulation values required by new regs, never managed to get 100mm studs to work without putting insulation on one side of it and therefore making the wall just the same thickness...

iamcornholio

You can form a timber frame external wall in 100mm timber with 100mm [Celotex] insulation between the studs. This can be clad externally and plasterboarded internally and will meet b/regs. However, it does not take account of sockets and switches, and so a further 25mm of insulation across the internal face is better, and 50mm better still.

Or use 150 timber and quilt insulation

If you are buying a kit of some sort, the obviously you need to consult the supplier to see what specification they are using for the frame.

If you DIY, you can work easily on standard 8x4 OSB sheets with stud spacing at 600mm centres and knock this up yourself