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pepapi t1_j5nb6h2 wrote

Reply to comment by Gryllan in Old disgusting bathroom gets a makeover (reupload) by Gryllan

Why use a waterproof substrate if you don't want to actually waterproof it?

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Gryllan OP t1_j5nbtf8 wrote

To be able to put floor heating on it, + it has an insulation property. You cant put floor heating on styrofoam, so you need a layer of something else. And these boards are stuff and sturdy and are approved for floor heating, theyre perfect

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