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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Building Questions >> Cavity Wall https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1428150503 Message started by Mosee on Apr 4^th, 2015, 1:28pm

Title: Cavity Wall
Post by Mosee on Apr 4^th, 2015, 1:28pm

Hi My builders have just started to build my external walls and have used a thermalite block to construct the external skin on my extension on one side , this side is next to my neighbours extension and will not be visible.
Is this construction okay. They have used brick for the internal wall.

Title: Re: Cavity Wall
Post by thescruff on Apr 4^th, 2015, 10:48pm

Brick external thermalite internal.

Are your builders English.

Don't part with any money.

Title: Re: Cavity Wall
Post by Lectrician on Apr 5^th, 2015, 8:42am

I've seen thermolite used for both internal and external skin, but never with brick on the internal. It can be used for external skins, but is very rarely done, and only where weight of above can accomodate it.

Title: Re: Cavity Wall
Post by woodsmith on Apr 5^th, 2015, 9:18am

On the face of it this sounds back to front. I would give your Building Control Officer a call and get him/her to pop round

Title: Re: Cavity Wall
Post by thescruff on Apr 5^th, 2015, 10:51am

Thermolite blocks are like blotting paper if external without any waterproof coating.