Mixing types of block in inner wall

[garyo]

My current extension is being built with 3.5N themalites inner skin and 3.5N fibolites outer skin.

I also have an internal wall that's within the thermal envelope on bother sides.

Due to a c*ck up in the quantity surveying, I'm 70 thermalites short and 70 fibolites long. Am I okay to mix the blocks on the inside wall?

Thanks

 

[23vc]

I’d say so, if it doesn’t compromise the overall u value (to an extent that bco will notice). Theoretcially you’re not meant to for expansion rate purposes, but given the number of walls out there with random mixes of different brick/block, you’re fine.

 

[garyo]

I’d say so, if it doesn’t compromise the overall u value (to an extent that bco will notice). Theoretcially you’re not meant to for expansion rate purposes, but given the number of walls out there with random mixes of different brick/block, you’re fine.

Cheers. It's an internal wall so u values don't really matter, so I was wondering more about the expansion side of things. How different can it be to the diffeeing expansion rate of the mortar between the blocks anyway?

 

[johnny2007]

Yeah, go ahead.
It's internal and it will be plastered.
Nobody will ever know and it makes no difference really.