Gap where two brick walls meet - what to fill with

abankerbutnotafatcat

Hello,

We have a single storey brick built lean to extension which we use as a utility room. Where it joins our house externally at a 90 degree angle there is a small gap of a few mm which we'd like to fill to completely weather proof it.

What should we use to fill this gap?

Thank you in advance for any help
Abbnafc

Captaincodpiece

Sand and cement?

ariba10

If it is only a small gap I would use a Mastic.

zaax

Captaincodpiece wrote: »

Sand and cement?

Of is cracks again it means the extension is moving away from the main building

Furts

ariba10 wrote: »

If it is only a small gap I would use a Mastic.

But make sure it is an appropriate type. Avoid acrylic window and door sealant, and anything water based, which includes decorators filler and caulk.

Jonesya

I'd look at a low-modulus, neutral cure, builders silicone.

Something like this:
http://www.toolstation.com/shop/p56400