Re: Attic kneewall insulation - proper roof venting?
These types of conditions are tricky.
Originally Posted by wheatandhoney
First thing --- you are probably correct regarding any air space along the sloped portion of the roof/ceiling. In which case a ridge vent is somewhat useless trying to incorporate into using to vent the attic spaces on either side of the kneewalls.
In most cases homes that have the configuration such as yours have 3 zones that are treated seperately --- 1 zone on one kneewall --- 1 zone above the flat part of the ceiling --- 1 zone on the other kneewall side.
The zones of the attic side of the kneewalls can have vent grates installed on the gable ends ( one on each end ) at the lowest point of the attic space. Roof top vents located at the point where the top of the knee wall meets the roof .
The top most attic space ( above the flat portion of the ceiling ) can have simple gable vents.
Or ---- if you spend a liitle more $$ and want to use the space on the outside part of the knee walls ---
turn those spaces into a semi-conditioned space by insulating the underside of the roof , the gable end walls , the floor , backside of the knee wall.
Spray foam is ideal for this situation --- if it's in the budget.
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