Had radiant floor in stalled on my first floor about two years ago and what Iím finding is it has a hard time keeping up on the coldest New England days. Current config is 3/8 Onix stapled up. Aprox 2Ē air gap with foil foam and fiberglass bat.
Tried maxing the mixing valve but still donít get much over 65.
60ís 1 Ĺ story cape recently renovated, new windows, doors, fully insulated.