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I seem to have a leak on one of the underfloor heating pipes. Is there a product to plug this leak without intervention on the concrete screed?

Normally, whether it's a simple piping or a underfloor heating system, any connection or welding is prohibited in the areas embedded in a screed. The because of such a leak is difficult to determine, especially since you do not specify the material that constitutes this pipe. There is no reliable product capable of plugging such a significant leak. However, if it is only a question of microwave leakage resulting in seepage, there are products that you can find in the heating section of do-it-yourself stores. You can try to add this additive to the circulating water of your heating before breaking your screed.

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