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what type of backing board is best
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[QUOTE="Tile Shop, post: 920582"] Hardie will take in moisture if not tanked. But unlike other porous substrates it will hold the moisture without going mushy or expanding, and water will later evaporate when the shower is not in use through either the grout joints or into the cavity behind (depending on how its fitted)........ and even into the wooden studs holding it up. So the reps stand by "it doesn't need tanking". But look at it this way, you have a leak between the tiles, or you have certain areas in your shower subject to excessive moisture, from through the grout or a failed area of silicone. The Hardie soaks up the water...... but how much water will it soak up? what happens when it can't take any more on? What if there is nowhere for the held water to evaporate to? it will fill up till it pis......tachios out. Hardie is water resistant, not waterproof which is what is required by the new British Standards. Yes it has to be a really substantial amount of water to cause a problem with Hardie, but for the sake of a 40-50 quid tanking kit compared to the amount this project is costing you already, and how much it could cost to fix a failure, is it really worth the risk of cutting corners? [/QUOTE]
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what type of backing board is best
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