i have a low-slope (2/12) shed roof over a single-story addition on the back of my 2-story house. the builder was forced to keep the slope low because of the 2nd floor windows. at the low end, the roof drains into a gutter. there is no soffit for ventilation. at the high end, the roof meets a wall. there is absolutely no ventilation in the roof. to make problems worse, there is no insulation in the ceiling/roof. i plan on insulating the roof in the next few weeks. should i use insulation with a vapor barrier or not?
Answers:
From: Randy Martin
yes, you may use an insulation with a vapor barrier and also install ventilation for your ceiling to prevent vaporization.
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