Firewall Construction

Hi all,

To set the scene, I have a old semi detached cottage which I'm currently in the process of restoring. It's a solid little place though, they really don't make them like they used to!

Out the back of the house there an old brick + stone walled single story extension that is mirrored on the neighbours side. Unfortunately in the loft space there is no firewall between the two.

The dividing wall is solid brick of 230mm thickness and runs up until it hits the loftspace. I'm in the process of removing the false ceiling and opening up the extension (its the kitchen) to full height so really need to get a firewall put in (it should have one anyway I guess).

Can I use aerated lightweight breeze blocks for this job or does it have to be something more substantial?

The size of the firewall will be

Height: 1550mm
Length: 1850mm

Thanks very much in advance,

Damo

 

Thanks for the replies. Appreciated.

Do you think a single skinned 140mm block wall would be suitable? It'll be 7 courses high roughly.
https://www.travisperkins.co.uk/Solid-Dense-Concrete-Block-7-3N-140mm---Pack-of-72/p/701037