I designed and installed a radiant floor heating system in our home now occupied for 6 winters which in Winnipeg Canada are harsh (-32 design temp). The installation used almost 4000 feet of 3/8″ ID Sceptre triple wall tubing stapled to 3/4 fir ply on 16″ o.c. joists and topped with 1 1/4″ Gypcrete. Finished floors were either ceramic and granite laid directly on gypcrete or hardwood (maple, walnut and cherry). Hardwood was 3/4″ x 2,3,4 or 5″ widths applied to 1 1/4″ fir sleepers screwed to subfloor on 8″to10″ centres. Tubing went between sleepers and gypcrete poured level with sleepers. I designed this approach before reading about similar designs in FH a few months later. In all the years of operation, the heating system has never made any popping sounds or developed stress cracks (I still have a few uncovered areas of Gypcrete where I can guage this). The amount of movement by the wood floors between summer and winter is minimal and very acceptable. It is the only way to go for comfort and cleanliness. Hope this helps. Alex
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