Bonus room over garage
Other than the additional square footage, there is nothing "bonus" about this room. It is unusable in summer and winter. It is of typical design...small flat attic above 8' flat ceiling in center of room that contains R-30 batts; sloped ceilings following roof rafters that are only R-19 and do not have continuous air chutes (therefore the side attics are not connected to the upper attic for ventilation purposes); side attic areas with the knee walls being non-backed and insulated with R-13 batts. Knee walls are only 3' high, so the side attics are largely inaccessible due to ducts etc.
I plan on accessing the side kneewalls from the garage ceiling below, removing the batts, installing top plates, apply an air sealant, reinsulating them and then backing them with duct board. While there, I will also block the open ends of the floor joists from the side attics. I do not want to remove the drywall from the sloped ceilings if at all possible, but would like to increase the R value in that area. Seems to me that dense packing this area would be the way to go. Home is located in Indiana and is about 8 years old. No real solar gain as room only contains one small window facing northeast. No evidence of any moisture presence or shingle degradation at all.
Roof is gable with soffit and ridge vents, although an ineffective design since the two attics are not connected properly.
Am I on the right track? Any other suggestions would be appreciated.
Posted Oct 27, 2010 1:38 PM ET
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