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Old 02-24-2010, 09:13 AM   #1
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I am putting more insulation in an 1880's home. We are re-siding the house also, so is it possible to do the insulation from the outside?

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Old 02-24-2010, 09:36 AM   #2
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If you're residing anyway, then sure it's not onyl possible but suggested. But you'll have to look into air movement barriers (like Tyvek) while doing that and then see about vapour barriers on the inside. On the other hand, if it's a choice between one and the other, spray-foaming it from the inside would be the easiest thing to do without altering the outside characteristics that much.

Don't get the cheap vinyl siding; that'll need repainting and/or replacing before you've paid for it.

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Old 02-24-2010, 01:06 PM   #3
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You should see a big difference. We did our attic and it added about 10 degrees during the winter/took off about the same in the summer.
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Old 02-24-2010, 09:33 PM   #4
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If you are going to be re-siding than definitely do the insulation from the outside. After the new insulation is sprayed in you can also add a layer of 4x8 sheets of foam from 1/2 an inch to a full inch to add some extra R-value before you side. But don't forget the housewrap water barrier. (Tyvek)
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