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We made a screed on radiant electric heating frame and we used as aggregate of the sand that we bought in Leroy Merlin bag but which turned out to be clean sand but not washed. A plasticizing adjuvant was also added. Will this have an impact on the thermal conductivity of this one or its solidity knowing that we will put floating floors on it? Thank you for responding to our concern.

With radiant underfloor heating, the thermal conductivity of the screed depends essentially on its thickness. Clean sand but presented as "no" washed should not affect its strength of a screed, designed more for moderate use. Above all, it is important to allow the screed to dry sufficiently for a minimum of one month, before considering the installation of a covering, in particular tiling, which is the best solution for a good transmission of heat and radiation. The moisture content of the screed must be less than 3%.
Note that floating flooring is not permitted by the DTU (unified technical document), on a floor heating (whatever is recommended by some manufacturers or distributors). It is preferable to pose glued. Remember stable species, such as oak and hard exotic woods, avoid beech, birch, maple... all nervous woods that react to temperature changes.

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