Best approach for attic insulation?
I recently moved in to an early '70s Colonial in zone 5. The attic is poorly insulated with a couple of inches of loose-fill that looks like fiberglass.
The attic has newer AC (not heating) equipment, including an air handler and some flexible insulated duct on the floor (not suspended). It's also poorly ventilated, with 2" ventilation grilles in the soffit about every 10 feet, no ridge vent, a gable vent on one end and a small vent in the roof on the end opposite the gable vent. Finally, the asphalt shingle roof is in decent shape but approximately 17 years old.
Given the location of HVAC mechanicals and already-poor ventilation, I'm considering removing existing loose insulation on attic floor and insulating the bottom of the roof deck, making the attic conditioned space.
Is this a generally a good idea? And if so, what is the best specific approach for my climate zone? (e.g., closed cell foam directly on bottom of roof deck with no ventilation followed by a fire barrier, etc). Also, is it critical to replace the roof before doing this project?
Please note that replacing or relocating the HVAC mechanicals is not in the budget.
Posted Wed, 10/09/2013 - 12:52
Edited Thu, 10/10/2013 - 06:35
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