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We live in a old (ca 1908) home in Winnipeg with a steep gambrell roof extending from the second to third floor. The existing insulation is wood chips in the knee walls, rock wool in the attic and I’m not sure what is is the sloped wall. We had a enery audit of our house and they found significant air leaks. We are having new shingles put on an are considering having icynene applied to the roof. The icynene company is suggesting applyling the foam to the roof sheathing behind the knee wall, filling the rafter space in the slope of the roof and then across the top of the attic. This is suppose to give us a good air seal. The fellow who performed the energy audit thought that this might be a dangerous approach since the roof would not be vented, and would create ice daming problems. At present there are no ice dams and the only vents we have are in the gable ends (although the existing air leaks probably vent the roof. Is the foam a good solution?
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We live in a old (ca 1908) home in Winnipeg with a steep gambrell roof extending from the second to third floor. The existing insulation is wood chips in the knee walls, rock wool in the attic and I'm not sure what is is the sloped wall. We had a enery audit of our house and they found significant air leaks. We are having new shingles put on an are considering having icynene applied to the roof. The icynene company is suggesting applyling the foam to the roof sheathing behind the knee wall, filling the rafter space in the slope of the roof and then across the top of the attic. This is suppose to give us a good air seal. The fellow who performed the energy audit thought that this might be a dangerous approach since the roof would not be vented, and would create ice daming problems. At present there are no ice dams and the only vents we have are in the gable ends (although the existing air leaks probably vent the roof. Is the foam a good solution?