On 12 Feb 2004 14:38:38 -0800, (Ben
Schofield) wrote:


The space has a suspended ceiling (belonging to the flat below) about
1m underneath it.

So, my question is: will 9.5mm of plasterboard and 18mm of chipboard,
plus the suspended ceiling below, give me the 30 mins fire resistance
I require?

If you are going over someone elses property then no matter what the
BR say think of your own security. Make sure the compartment is
smoke proof for a start - fires rarely kill - their combustion
product beat them to it. It used to be that a double layer of
plasterboard was adequate to give 30 min resistance - I'm not sure if
this is still so but it isn't far out.

The suspended ceiling should be ignored in any fire resistance
estimations.

What about 18mm of chipboard alone?

No.

--
Peter Parry.
http://www.wpp.ltd.uk/