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I'm fitting hardboard on my bathroom's floor in order to glue vinyl on top of it. However I'm using 2 kinds of hardboard. One is 3mm thick, and the other 2mm. Is this a problem, and if so is there an easy solution for it?

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I explained the difference in the other one. –  drake035 Sep 28 '13 at 18:29
    
You left us hanging on the other question. Do you have a subfloor? Is it plywood? Is it flat? If so, you may not need to add hardboard. If you do add hardboard, I don't know why you'd use two different thicknesses. The easy solution is to not use two different thicknesses. –  DA01 Sep 28 '13 at 19:45
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I don't think using two different heights is a good idea. For one, you'll introduce water pooling, depending on where the heights vary. For another, you're ensuring that the vinyl is always under the risk of stress where different heights meet under the same sheet.

The easy solution is to use only one height of hardboard - stick to either 2mm or 3mm.

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+1 - Well said. –  Michael Karas Sep 28 '13 at 19:39
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