Intumescent wall socket boxes?

[^woody^]

I have a few sockets/light switch boxes in a timber frame wall, and I need to maintain the walls fire rating.

The wall is basically solid celotex insulation and a plasterboard face. No cavity.

The boxes I am using are dry lining ones which will be fixed to the plasterboard, and not fixed to a support noggin or the timber frame.

So can someone recommend me a suitable intumescent product, and a supplier?

I should add that I don't really want to have a large void behind the socket - the box should ideally fit snug into the insulation

 

[Pensdown]

What is the fire rating of the wall and where do you want to maintain/repair the fire rating? I've never had a problem with the Fire Officer when installing sockets and switches as you've described in a 1/2hr rated wall.

 

[^woody^]

This is a structural external wall, not a stud partition.

Any fire in the room or socket will potentially melt the celotex in no time and spread to the timber frame.

The wall will be 1/2 hour rated so this needs to be maintained. Even on a practical basis, its best to limit possible damage to the frame - which would be expensive and difficult to repair

 

[ban-all-sheds]

http://www.google.co.uk/search?sour...e=UTF-8&rlz=1T4GGLG_en-GB&q=intumescent+putty

 

[^woody^]

Yes, I've done the google thing, but just wondered if anyone had any comments on whether one system was better than another.

Putty does seem the most appropriate