fire regulations internal lining timber

DAVIDLE

Hi all

Is there any building regulation restriction on use of timber cladding (Class 3 (National) material) to interior of living area on wall/ ceiling of dwelling.

Part B requires that:

Part of the surface of a wall in a room may be of a class lower than specified in 2.1, (but not
lower than Class D - s3, d2 (European) or Class 3 (National)) if the area of that part (or, if there are two or more such parts, the total area of those parts) does not exceed, the lesser of the following -
(i) half the floor area of the room, or
(ii) 20 m2

Thats fine so far -that tells me that I can have 20m2 or half floor area in timber internal cladding.

but then the regs seem to contradict this by saying:

In the case of a wall surface in a building of Purpose Group 1, 2, or 5 the area of that part should not exceed 5 m 2 and should be separated from any other such part by a distance of not less than 2 m

which would suggest to me that I can only have 5m2 of a class 3 material (i.e. timber).

I am unsure which should be the case 20m2 or 5m2????

thanks

BryanF

DAVIDLE wrote: »

Hi all

Is there any building regulation restriction on use of timber cladding (Class 3 (National) material) to interior of living area on wall/ ceiling of dwelling.

Part B requires that:

Part of the surface of a wall in a room may be of a class lower than specified in 2.1, (but not
lower than Class D - s3, d2 (European) or Class 3 (National)) if the area of that part (or, if there are two or more such parts, the total area of those parts) does not exceed, the lesser of the following -
(i) half the floor area of the room, or
(ii) 20 m2

Thats fine so far -that tells me that I can have 20m2 or half floor area in timber internal cladding.

but then the regs seem to contradict this by saying:

In the case of a wall surface in a building of Purpose Group 1, 2, or 5 the area of that part should not exceed 5 m 2 and should be separated from any other such part by a distance of not less than 2 m

which would suggest to me that I can only have 5m2 of a class 3 material (i.e. timber).

I am unsure which should be the case 20m2 or 5m2????

thanks

Purpose groups are not the same thing as class of materials
Please read part b again

DAVIDLE

Im fully aware of that.

Any other advise from anybody?
thanks.

sydthebeat

total unprotected area in a room should not exceed 20 m2 but:

no area of cladding shall be more than 5m2 in total and then separated from the next area by at least 2m

so 4 x 5m2 'panels' can be used as long as they are separated by at least 2m

DAVIDLE

Thanks Syd.
seems to mean that the idea of a timber paneled interior is a complete 'no-no.'

I have always wondered how timbered paneled pubs/ holiday chalets can comply???

sydthebeat

DAVIDLE wrote: »

Thanks Syd.
seems to mean that the idea of a timber paneled interior is a complete 'no-no.'

I have always wondered how timbered paneled pubs/ holiday chalets can comply???

you can treat the wood so that it has accepetable fire spread performance.

google impregnated fire treatment.

DAVIDLE

thanks again Syd.
problem solved.