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Is it smart to insulate the roof rafters in Minnesota?

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Josh says:
October 9, 2011 at 4:48 pm

I was wondering if it would be a smart idea to insulate the roof rafters to my house in Minnesota? Currently there is no insulation in the house and part of the upstairs walls are the actual roof (the ceilings are pitched on the sides).

There is also storage on both sides of upstairs, which would be above the soffits. So I was thinking if I insulated the entire underside of the roof and had no attic ventilators, that it would provide proper insulation and have no condensation issues?
asked in Attic Area by darekrudy (21,730 points)
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1 Answer

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Hi Josh,

Read this posts: cathedral ceiling insulation, and check my answer to Tim's question where he was asking about insulating cathedral ceiling as well. There are a few options explained but the cheapest would be to install baffles between the rafters (from the soffit to the ridge), a ridge vent, and insulate rafter space to at least R-40 value using regular insulation. The best option would be to go with a spray foam (closed cell) directly onto the decking, but that’s expensive.

answered by darekrudy (21,730 points)
edited by darekrudy