I am looking to install a shower in a cupboard we've knocked through into the bathroom.
I've had several quotes now and im a little confused of what is best to attach acyrilic shower panels onto, a timber frame is ready and upon asking some of the bathroom fitters, they say marine ply, some say ply with pva, some have even suggested plasterboard is fine.
I am guessing the shower panels are waterproof anyway so does it really matter ? Is marine ply too excessive just right or just a waste of money? I would like to get some opinions on what to use. Im happy to spend more and get somethign that will last longer but the amount of conflicting information is putting me at a loss at the moment.
It’s really a case of horses for courses - some prefer to be as safe as possible and insure in the unlikely event of a leak that damage will be limited by using marine ply. Using standard ply should also be fine and will ensure rigidity across the frame and the ova will provide a waterproof seal and aid with bonding.
If there is a timber frame already in place you can use plasterboard as long as the timber frame does not allow any flex in the plasterboard. You can install additional stud work and noggins to make the frame more rigid.
I think the idea of using marine ply etc is that in case your shower isn't waterproof, at least at some point in the future, you won't get rapid deterioration in whatever is behind the shower.
I've also seen people painting ply/marine ply with pva - as a waterproofing coat. Exterior pva though (even then, some say pva is not for areas likely to suffer a lot of moisture). Belt and braces again. You can of course buy stuff for tanking shower areas - it's a bit like a rubbery paint you can paint on - it's strong enough to tile onto as well. WhiteStar? is a good name, expensive though.
The other option might be tilebacker board - made by Knauf or Hardibacker. It's a cementitious particle board and screws into studwork. You buy a pack of special screws with it and can also buy a tube of sealant to seal the joints between the panels (although, I think they say you can get away with silicone too).
I would say that although I'm not sure how your shower goes together, you need to put fillets of silicone (i.e. something flexible) down the joints where the panels meet (if there are joints) as grout doesn't flex and joints between two different panels can move and flex, so need a flexible sealant.
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