Timber Extension

[DAJ]

In brief, I wish to build a wood framed extension cladded externally. Two of the elevalions are of brick; in other words the extension will be in a corner (if that makes sense). My intention was to construct the frame from 4 x 2, weatherboard externally and plasterboard internally.

My questions are...

1. Do i need a membrane either behind the weatherboard or plasterboard or both.

2. do I insulate with celotex or rockwool type insulation.

3. Do I need to install felt behind the weatherboard.

4. Can I batten, insulate then plasterboard direct onto the bricked elevations.

5. does the frame need to be treated against rot or fire prevention.

6. Where can I find building regs for the above.

Any help would be appreciated.

 

[PrenticeBoyofDerry]

1) likely both, outside wall breathable and internal vapour check
2) yes or something simular
3) not sure
4) yes
5) best if you do
6) http://www.communities.gov.uk/planningandbuilding/buildingregulations/