Shower area plasterboard joints..

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Gashead86

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HI All,

Just after some advice on what people think is the best thing to use on plasterboard joints in a shower enclosure / area?

I have used water resistant boards anyway, but as I have some joints where I needed to allow for a shower niche to be cut in I am unsure what do with these joints to make ready for tiling.

My builder who was onsite doing some other bits suggested taping the joints and then using some bonding plaster on the joints.. I have looked online and cannot find anything to suggest that is a good waterproofer?

Is there a product out there that I should be using on these joints?

Thanks for any help offered all.
 
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RandomGrinch said:
At the risk of sounding like a broken record (as I have mentioned in other threads!), I have found this kit to be really useful:
https://www.screwfix.com/p/mapei-shower-waterproofing-kit/78484
I would tank the whole shower enclosure. It has lessened my worries about unseen leaks and rot! And as stated, 'water resistant' boards are not 'water proof'! :)
Click to expand...

Thank you for the response, that is really helpful!

A builder friend of mine suggested PVA as a good water proofer.. Is that not sufficient in your opinion?
 
Normal PVA is water soluble, so...No! ;)
(There are waterproof versions available!)
The tanking solution is like a thick paint and creates a rubbery waterproof layer to be tiled over, rather than just sealing the surface as with PVA.
The kit also comes with reinforced corner strips that would seem to be ideal for covering the board joints in your situation.
PVA is definitely cheaper though! :)
 
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Gashead86 said:
Thank you for the response, that is really helpful!

A builder friend of mine suggested PVA as a good water proofer.. Is that not sufficient in your opinion?
Click to expand...

PVA is not suitable as a waterproofer. When it becomes damp it re-mulsifies. PVA should never be used prior to tiling. At a minimum use SBR or a proprietary tanking system.
 
I would tape the joins using the Mapei product mentioned by the others.

BTW, FYI, tanked plasterboard has a greater load bearing than plastered plasterboard.
 
with so many tile boards, including waterproof ones, insulted ones etc, surely there is never really a place for plasterboard within a shower/bath area?
 
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