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can anyone tell me if its ok to tile over hardwall plaster which is going to be wher the new shower will be .the area is about 2.5 high and 600 wide .should i just hack it off and sand and cement it. or am i just being paranoid. cheers
 
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6spidermonkeys

cheers mate .thought i try this forum lark out .if you dont ask you don find out
 

Andy Allen

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welcome to the forum, tiles can not be applied to any thistle undercoat plasters, except thistle dri-coat, so best to hack it off or scim over with a finish plaster...:thumbsup:
 
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6spidermonkeys

me thinks me be hacking it off and cement render.worth the piece of mind cheers al
 
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6spidermonkeys

can do whats the difference with hardwall and plasterboard apart from the paper on plasterboard there both pretty soft cheers alan
 
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6spidermonkeys

can do whats the difference with hardwall and plasterboard apart from the paper on plasterboard there both pretty soft cheers alan
i think i know the answer to this would it make a difference if i pva the hardwall before tilling
 
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Bubblecraft

Hi & welcome. PVA is a swear word about here. Unfortunately it is a big no no. As stated above, best bet is to dot & dab or coat with a finishing plaster
 
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Bubblecraft

When you treat a surface with PVA it partly soaks in and parlty sits on the surface of the substrate much in the same way as wallpaper paste.

If PVA gets wet it becomes slightly live again, it doesn't completely return to it's liquid state but it becomes sticky.

When you spread tile https://www.tilersforums.com/forums/tile-adhesive/ onto the wall or floor, the water in the https://www.tilersforums.com/forums/tile-adhesive/ makes the PVA live and stops the https://www.tilersforums.com/forums/tile-adhesive/ from penetrating the substrate and providing a mechanical grip. Basically your tiles, grout and https://www.tilersforums.com/forums/tile-adhesive/ are being held to the wall or floor by a thin layer of PVA.

Most tile https://www.tilersforums.com/forums/tile-adhesive/ works by crystalising when it sets (some are slightly different such as epoxy based ones) but generally they all work the same way. Once the https://www.tilersforums.com/forums/tile-adhesive/ starts to set, crystals from and expand into any imperfections in the substrate surface (at a microscopic level) to create a grip. PVA stops this process by creating a barrier between the substrate and the tile https://www.tilersforums.com/forums/tile-adhesive/.

Dedicated primers soak right in to the substrate and stop the sponge like "draw "effect but they don't coat the surface in any way, they are an impregnator as opposed to a barrier.

Hope that clears things up
 

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