Using Heat Stop 50 and Perlite for insulating render

[gregsbrickoven]

Hi all,
Very new to masonry.
Is it okay to mix perlite with Heat Stop 50 in a 5: 1 ratio as the render coating? If OK, is it overkill?
Thanks in advance!

[david s]

Yes, it’s overkill as it won’t see high temperature. Normal OPC is sufficient there and as there is a big price difference you are wasting your money. It also has a much shorter working time, potentially increasing wastage if you’re not fast enough placing it.

[gregsbrickoven]

Thank you David! I was thinking it might be overkill.

[bentedesco]

Definitely overkill, I am using quikwall for my render

[gregsbrickoven]

thanks Bentedesco!