Durabase WP

[osmyth]

and then factor in adhesive and grout at 4kg per m2, pushing it way over safe limits. However unskimmed plasterboard would bear this weight and the WP membrane safely.

so how easy is it to take skim off the plasterboard?!

 

[doug boardley]

so how easy is it to take skim off the plasterboard?!

Not easy, best to rip it out and re-board. Then I'd use Hardibacker 500 in the "wet areas" and 12.5mm plasterboard in the dry areas.

 

[CarlGHudson]

Hi, Hope I'm not breaching some etiquet by jumping on your thread but its very similar to what I'm up to so my questions are related and might be useful:

I am using C1 on 22mm plywood and an Impey Aquadec; does the plywood need coating in anything?

I am using WP on skimmed plasterboard and intend sticking on some mosafil glass mosaics; what is the maximum weight limit on skimmed plasterboard - I'd only considered the weight limit on the WP?

I have tried sticking some of the C1 on to the Aquadec using Mapei Buildfix C2F Stone and Porcelaine Rapid Set White mixed with Buildfix Flexible additive and it doesn't stick too well; it would be OK for floor but certainly not for wall tiles. Any idea why this might be the case?

 

[osmyth]

Hi, Hope I'm not breaching some etiquet by jumping on your thread but its very similar to what I'm up to so my questions are related and might be useful:

I am using C1 on 22mm plywood and an Impey Aquadec; does the plywood need coating in anything?

I am using WP on skimmed plasterboard and intend sticking on some mosafil glass mosaics; what is the maximum weight limit on skimmed plasterboard - I'd only considered the weight limit on the WP?

I have tried sticking some of the C1 on to the Aquadec using Mapei Buildfix C2F Stone and Porcelaine Rapid Set White mixed with Buildfix Flexible additive and it doesn't stick too well; it would be OK for floor but certainly not for wall tiles. Any idea why this might be the case?

Carl, re weight limit on skimmed plasterboard - 20kg per sq.m including adhesive/grout.
Our tiles alone were 22kg so with adh/grout of about another 4kg, it is reasonably above the limit.
We're changing to tiles which are 16kg, just to be safe.

Ci is designed for the floor as it decouples as well as waterproofs, hence 3mm thick.
WP is designed for walls just as a waterproofer, hence just 0.15mm thick.

 

[CarlGHudson]

Thanks for this; do you know if the grout I have got is suitable as it wasn't sticking to the Aquadec?

Also do I need to do anything to the plywood?

 

[Dan]

Just bumping this thread. If it's not a current topic then don't worry about it for now. Other threads like this can be found in the main tiling forum. If you do want to reply to it, please do. Your information may add value to somebody reading the forum in the future.