Intumescent paste/mastic question

[matskm]

Hi All,

My project is an ensuite bathroom above the garage. I am boxing off a bunch of pipes in the garage (soil pipe, hot and cold water pipes) because Building Control said I need to (fire safety). There are a few places where the plasterboard which is going on top of the timber framing will have to be "notched" to accomodate small water pipes.

Building control suggested I fill in the gaps between the pipes and edge of the board with intumescent paste/mastic. Does this sound like a good idea?

It seems to be that some of the gaps will be large (one pipe sits about 7 cm from the wall, so the "gap" will be (5x2 cm) ) - and this sounds too much for mastic.

Also, does anyone know what exact product to buy?

Apologies if this is the wrong forum for the topic.

cheers

Mat

 

[freddiemercurystwin]

The fire integrity should be maintained so yes.

http://www.fireprotectiononline.co.uk/economy-fire-rated-foam.html
or
http://www.fireprotectiononline.co.uk/intumescent-mastic.html

 

[matskm]

Thanks! That's very helpful. The mastic product in particular says that it will fill spaces up to 25mm wide - and I don't anticipate gaps bigger than that (may be a long thin rectangular gap, say 50x25mm - but this should do it).