| Yes, the cold air dropping down from the second floor is affecting the first but, I think it goes 'deeper' than what's been mentioned here.
What's the temperture of the basment below the first floor? Is it heated? If you needed insulation, chances are it's not. What is the insulation you have installed between the joists below your installation of radiant? Is it there just R-19 batting below, a reflective insualtion then batting? What's the total 'R' if there's more than 1 type? What's the design; Radiant panels, 2" drop to a reflective barrier then a batting, etc.. |