My underfloor heating system installer has told me that self-levelling flowing screed is the best for UFHS, why is this?
A. UFHS installers are basically plumbers, they dont know a great deal about floor screed…..Most tend to give info. parrot-fashion, just saying that is what you should use cos liquid screeds wrap around the underneath of the heating pipe, giving better heat transfer. But lets face it where is the heat going to go anyway, with a good amount of insulation that should be under the heating pipes it wont be going through the insulation….It is mis-leading sales pitch used by a company that isnt a major supplier of traditional screed to floor screeding contractors…..Take into account that thinner screeds, such as flowing screeds, can have the undisired effect of hot/cool spots between heating pipes, so a lower thermal transfer would be an advantage. If after this you still want to go for flowing screed on a small UFHS floor, then there is an abundance of companies that will be willing to take your money.
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