Converting to hard walls.

[Bob Rowlands]

Any roof system packed with insulation that has no way to ventilate, and can get moist air from a kitchen, is going to be prone to water condensation -its a roof and roof get cold- and resultant mold. Air needs to pass over the insulation and draw

moisture

to the outside.

Case in point, we had friend that packed insulation between their 2x10 cut rafters in the vaulted LR and second story loft. No air space between the roof sheathing and insulation, and no gable ridge vent.

Mold ensued and they literally had black streaks running down the ceiling T@G boards. I advised them beforehand to go one size under on insulation, 8" batts in their 2x10 cut roof.

No dice. Well the interior t&g got torn out, insulation redone, plastic sheeting stapled to rafter bottoms, strip soffit vents and full ridgeline vent. Problem solved. btw I helped frame their house and worked on the cut rafter roof for one day.