30 Apr '12, 3pm

Green Building Q&A: Attic HVAC and Radiant Barrier

As part of a major renovation/addition to our 1970 2 story colonial house, we're isolating the 2nd floor HVAC and adding a second zone for it, and the contractors want to place the equipment in our unconditioned attic. It get's pretty hot up there in the summer (even though I live in NJ), and I want to do what I can to maximize the efficiency of the HVAC equipment in the attic. The insulation in the attic right now is awful, so the plan is to remove the crappy old stuff up there, spray-foam the attic floor with 1.5" of closed cell foam and then put R-38 batts on top of that (after replacing some old non-insulation rated pot lights from the second floor ceilings). Ventilation in the attic is a bit of a challenge since it is a hip roof (the main house is about 42ft x 26ft), so we're also going to be opening up the soffts as much as possible and putting in a new fan with humi...

Full article: http://www.greenbuildingadvisor.com/community/forum/energ...

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