General: Fire resistance of wood

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- CommentAuthorborpin
- CommentTimeAug 26th 2012
Does anyone know what the fire resistance of wood is and where I might find some definitive tables?

In Scotland you need to put fire stops in wall cavities to give 30 mins resistance. This is generally accepted as being a 50x50 soft wood batten. I am wondering if 18mm ply gives an equivalent level of protection or if not whether a batten to 'thicken' it would do.

Suffice to say that the BCO is scratching his head on this one (LOL). When asked to show why 50x50 was acceptable it seems they can't. It just is!
- CommentAuthortony
- CommentTimeAug 26th 2012
dependant on thickness so ply is unlikely to do it
- CommentAuthorborpin
- CommentTimeAug 26th 2012
Posted By: tonydependant on thickness so ply is unlikely to do it
But is there a definitive guide or table somewhere. I am inclined to agree that it will not be sufficient.
- CommentAuthorTimber
- CommentTimeAug 26th 2012
38 mm of solid timber is the minimum possible for a cavity barrier, if using solid timber.

Plywood has a char rate of 0.8mm a minute (prehaps a bit less) - so you can work out how much you need to give 30 mins charring. However you might need to add a bit more on to allow fixings to still hold and support theweight of the window.

It should be possible to use the ply as the cavity barrier, however.

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