Attic insulation in a 101 year old Victorian
#1
11-01-04, 10:32 AM
Attic insulation in a 101 year old Victorian
I just purchased a 101 year old Victorian and in all of those years no one has ever put any insulation in the rafters of the roof. Is there a reason why this would not be done? What is the best insulation to use?. I have looked at batts and this is what I want to use but the only R value that I can find that will fit is R19. The rood rafters are 24" on center and made out of 2 X 6. Any suggestions???
#2
11-01-04, 10:51 AM
If you do mean the roof rafters you want to put up first the foam rafter vents so air can get over the insulation. and paper side down to the room or attic. Is there no insulation over the ceiling below? you can get R13 and R19 in 24" wide.
ED
ED
#5
11-01-04, 11:55 AM
Super Moderator
More info would be helpful
What really needs to be known is where you live and what are the coldest temps you experience.
#10
11-02-04, 06:08 AM
Home Depot and Lowes have the foam rafter vents. they go up first so that the insulation dont touch the roof . This will let the air from the vents in the over hang get up in there.
ED
ED
#11
11-02-04, 06:16 AM
Super Moderator
Yes, thank-you.
What you have to do is make sure that the space between the insulation and the underside of the roof deck is well ventilated, using the foam spacers that Ed suggested.
You also will have to install a well sealed vapor barrier between the insulation and drywall.
This will slow down the infiltration of moisture into the space that would cause a build up of condensation and frost.
This is necessary when outside temps are below freezing.
In addition, you will need to find a way to provide ventilation to the joist space to allow the foam spacers to be able to circulate the air to outside.
You also will have to install a well sealed vapor barrier between the insulation and drywall.
This will slow down the infiltration of moisture into the space that would cause a build up of condensation and frost.
This is necessary when outside temps are below freezing.
In addition, you will need to find a way to provide ventilation to the joist space to allow the foam spacers to be able to circulate the air to outside.
#14
11-04-04, 04:15 PM
Geoff Check them out at home depot and lowes .Some still have them made out of cardboard. You would have to look around for what they have out there by you for rafter vents
ED
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