Attic Insulation


Old 10-23-04, 02:24 PM
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Post Attic Insulation

I am finishing an attic in a 100+ year old home. The rafters are 2x6s.

1) With proper vents, R-19 seems to fit (somewhat tightly). Is a tight fit ok or will the roof life be decreased?

2) I am planning to use R-38 behind the kneewalls and in the cieling.
I know it is not ideal, but is R-19 sufficient for the rafter bays? ( I do not want to fir out)

3) I will connect the soffit vents with the ridge vent via proper vents. Is this enough? Do you suggest more vents? a power vent? surface vents?

4) Size wise, the rafter bays are all over the map. some bays are 24" wide, others are 16" wide and others fall in between. Is it better for me to use 24" insulation or 16"?

5) If I insulate now and use a vapor barrier, can I live in the space now and take my time getting the sheet rock up?

Sorry for so many questions at once.

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Old 10-25-04, 06:03 PM
Ed Imeduc's Avatar
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#1 you need the foam rafter vents up there so the insulation dont touch the roof

#2 Put the R 38 on the ceiling there and the R19 in the kneewalls

#3 You need 1 sq ft for 150 sq ft of attic try for 1/2 in and 1/2 out

#4 get 24" and cut it to fit the others.

#5 Yes be sure and put any paper side insulation to the room side Then a 4 mil clear poly over it.on the room side so it right under the drywall


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