Expanded galvanised mesh in blockwork -advice please!

17 Nov 2020
Reaction score
United Kingdom
Hi all!

I am currently building a 2 story extension.

It’s a cavity wall, with 7n dense blocks outer leaf and a 3.6n aerated blocks for the inner leaf.

What are peoples thoughts on expanded galvanised mesh?

Do I need to use it in the blockwork?
Is it vital?
Is it overkill?
Should I use it on only the inner leaf?
Does it reduce the chance of the aerated blocks cracking?

any suggestions would be welcome!

Sponsored Links
Why do you think you need it? It’s only used in specific, not very common situations
Thank for the reply 23vc.

To answer your question , I simply didn’t know if I needed it or not. I’m fairly new to building and I’m learning all the time.

I built an extension last year and had a few cracks in the aerated blocks.

fortunately, they havnt got any worse and I think they have settled.

I wondered if I had missed a trick by not using mesh???

I didn’t want to make the same error again, that was all.

Sponsored Links
Aerated blocks (in particular) are prone to the odd vertical shrinkage crack, totally normal and hard to avoid. Proper storage and correct mix helps but won’t totally eliminate it. I don’t think bedding mesh in the wall is the answer and after trying to lay a few courses you’ll agree…

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local