hardcoat hardwall plaster

[Mr Blobby]

I know absolutely nothing about plastering.  Nothing at all, except that our build wil be wet plastered for the airtightness layer.

 

But then a sales geezer who came onsite to talk about the roof build up said we should be using hardcoat as a base coat becasue it is more airtight than sand/cement.

 

As far as I can see the hardcoat https://www.gyproc.ie/products-systems/products/gyproc-hard-coat  is the same as the Hardwall product in GB but in Irealand its called hardcoat just to confuse everyone.

 

The hardcoat looks like a gypsum based base coat.  Should I be using this product?  Any other plastering tips?

 

Thanks to the plasterers on here for your help and advice...

[nod]

He probably knows less than you do about plastering Hardwall tough coat Sand and cement are all fine 

Sand and cement being the densest of the three