Closed Cell vs Cellulose in Cape Style Home Attic

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Old 07-20-18, 12:28 PM
J
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Closed Cell vs Cellulose in Cape Style Home Attic

Trying to maximze the comfort in my cape stlye home in the upstairs bedrooms.

I am going to be gutting the upstairs rooms and renovate them. I want to properly insulate the entire upstairs. I am torn between 2x options:

1. Closed Cell Spray Foam insulation of R30 from the sofit to the Ridge (For this option I do have 2x8 rafters for the sloped ceilings. The knee walls and attic above the ceiling become conditioned space and I wouldnt need to insulate the ceiling or kneewalls. But why heat/cool these areas if it is not needed?

2. Dense pack the sloped ceilings with cellulose, air baffles on the sloped ceiling for ventilation into the attic. For the kneewalls, install 2" rigid foam board with radiant barrierr to block the heat from the kneewalls to come through. For the ceiling, R49 cellulose and on the gable side, install cellulose and then face it with 1/2" rigid foam to air seal as best as possible.

Which option is a better choice for a cape style home? Is there an even better option?
 
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Old 07-20-18, 04:43 PM
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I've had 2 homes with cellulose and never had any issues. I've read about issues with foam and out gassing but honestly do not know if that is something in the past or current.

So what are the prices?
 
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Old 07-21-18, 04:52 AM
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Not sure about the cellulose, waiting on the quote for that one.

for the closed cell spray foam, it’s $5 a square foot for 4.5” of closed cell.
 
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