Insulating walk-up attic space
I own a house in Detroit (zone 5) that I am renovating and will probably sell when ready. The house has a basement, 2 floors, and a walk-up attic. The total square footage per floor is about 550 square feet.
The house has cedar shake siding with no insulation in the walls. It has about 2 inches of vermiculite insulation below the floor boards in the attic. The attic has a peaked roof and measures about 11 feet from the floor to the ridge board. There are no soffits and no venting (other than generally being vented or leaky everywhere.) There is a window at each gable end in the attic.
I had been thinking about putting down 1/2 inch plywood over the entire attic floor, taping the seams, and blowing in cellulose. This would render the attic space unusable but would probably be the cheapest option. If I do that I am uncertain what to do around the edges. For the plywood to add any airtightness, I assume that the edges would have to be sealed down to the level below the attic floor.
Is there any need for rafter vents (baffles) if there are no soffit vents? Would it make sense instead to spray closed cell foam around the perimeter up to about 18" to seal the edges and block the cellulose from contacting the roof sheathing?
I would like to insulate the attic although I am uncertain of the payback when selling the house. Since it is an expensive house to heat, I would think that insulation would be a good selling point. Any thoughts? Thanks.
Posted Mon, 12/23/2013 - 14:25
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