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Ive found a levelling and filling compound product which is supposed to be good for filling the gaps around the underlay sheets. Is this OK to use?

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Ive found a levelling and filling compound product which is supposed to be good for filling the gaps around the underlay sheets. Is this OK to use?

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A. No. The documented procedure for leaving small gaps is for expansion/contraction due to variations in moisture. Filling this gap could lead to future problems.

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