It may keep the heating bill down just a tad, but it can cause the roof to
rot away from the trapped moisture. The colder the better. That means the
insulation in the ceiling it doing the job of keeping heat in the house.
Go to this site, then click on everything in blue "energy loss, heat build
up, moisture & condensation, etc". You will have a better understanding of
how a house works. To repeat the advice already given, the answer is:don't
block your vents.
I would not do it, most of VA has high humidity and has not gotten that
cold. If you did block the vents the humidity would most likely be even
higher. The end result of this would be:
1. The moisture would attack the underside of the roof deck.
2. The Moisture would get into the insulation, making it less effective.
3. Warmth plus humidity = mold/mildew.
and if the weather turns cold and we get snow you could get some Ice
It would be better to increase the insulation in the attic to R-48 or more
and look at the other things like weather stripping.
Naw, keep the roof cold. Insulate the ceiling instead. The ridge vent is
purposely installed at some expense, for a reason. The reason is to keep
the roof cold. That helps in preventing ice dams. Keep the ceiling warm
and the roof cold.
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