Plasterboard alternative for garage

[orbit123]

Hi,

we're building quite a large timber garage and it looks likely it will need fire protection inside and out (after Building Control initially saying it did not and passing drawings!).

Plasterboard inside seems cheapest option for the required cover (30 minutes I think). I'm not a fan of plasterboard in outbuildings though - always seems to go a bit damp. We're in West Scotland so can be wet and cold a lot which doesn't help.

Any other ideas on what to use? I was planning to put OSB on the walls and I think you get fire resistant OSB but seems to be very expensive.

Thanks.

[orbit123]

It seems to be the size and fact it is within 5m of boundary.

Building control are torture though - none of this has been mentioned until build has started and even then I have it in a vague email from the BCO - but can't get hold of the guy to discuss with him. Been trying over a week now.

Any idea on the costs of Hardie Panels? Struggling to see any online.

Another idea was plasterboard (for fire cover) and then sheet over with OSB or ply. Plasterboard also not that great for knocks and bumps.

[orbit123]

Fermacell looks like what I was thinking of - seems like fibre reinforced plasterboard? Will get a look at both, thanks.

[orbit123]

I think chap that did the drawings has been terrible but don't have much to compare to.
I managed to find fire regulations via Google in 5 minutes though...

Someone at BC hopefully going to call me back today. They've actually been ok to be fair - just can't get hold of anyone over past few days.

[orbit123]

Thanks all. Got BCO in end (different guy) and he was very helpful. Plasterboard inside is all we need for fire cover but something like the fermacell a bit harder for knocks and bumps. They all seem quite pricey but hopefully worth it vs standard plasterboard.
Reason for fire cover is the square meterage of the wall that lies along the boundary. There is a formula for distance from boundary and size of wall built from timber.