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[email protected][_2_] trader4@optonline.net[_2_] is offline
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Default Ridge Vent or Box Vents?

On Apr 9, 11:04*pm, "Pat" wrote:
The estimate includes:


SOFFIT VENTS
Install ten (10), 6" x 16" size, in client selected color screened soffit
vents in overhangs.


Nowadays 16" or more attic insulation is required by code. *It may be
difficult to prevent the insulation from blocking the air flow from soffit
vents. *If you install baffles to hold the insulation back you may be
putting a flow of cold air next to your ceiling.
*A cold spot on your
ceiling allows mold to grow.



The baffles are up against the roof sheathing, not
the ceiling. If you do the geometry, before they get
to the beginning of the ceiling sheetrock they have
many inches of clearance for insulation. They are
routinely used that way with no problems. It's
precisely what they are designed for.


*Might be better to install roof vents just
above the insulation at the bottom of the roof and again at the top. *When
you have continuous venting at the soffit and ridge the venting can be
reduced by 50%.


Reduced 50%? As compared to what? With continuous
venting you almost always wind up with more venting
area. And even if you had venting area with continuous
vents that was just equal to that of box vents, why would
it be reduced by 50%?


*Since you do not have continuous soffit venting a ridge
vent may be undersized by 50%.


Another point that makes no sense to me.