Is this sand/cement backing???

[White Room]

I would stabilize with a 3-1 sbr or 4-1, with the minimal looking devil floating out it could be a weak s/c mix....

 

[thedman]

I will do exactly that then.

Its going to be above a shower over bath, should I stabilize with a 3-1 sbr or 4-1 then tank with WP1, then use singlepart flexible as addy. Do I need flexible grout?? and how long do I leave the SBR for??

Thanks whitebeam.

Dave.

 

[thedman]

Thanks everyone to be honest...

Especially Diamond Pool Finishers who seems most adamant its s/c ---- I'm in agreement.

15 years ago I got a degree in Chemistry, one module - 10 weeks, was cement, 10 flipping weeks of cement, damn it seemed boring then. Wish I had paid attention!!!

 

[White Room]

My preference would be a 4-1 so it soaks in to s/c to stabilize, if your going to use WP1 I would use some of the powdered adhesive to flatten out the old s/c with the flat part of your trowel.

where your going to use the tanking...just a really tight coat and leave to dry otherwise you will be using a lot of tanking material on the rough surface.

Prime with the manufacturers acrylic primer and then apply your tanking.

 

[thedman]

Thanks a million. i really appreciate it.

 

[widler]

Defo sand cement,do as whitebeam and diamond say.
1976 a bit before my time but in 86 we still used sand cement, with fairy


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