Originally Posted By: rking
This post was automatically imported from our archived forum.
Poor ventilation is when the air cannot move from top to bottom or vice versa.
There is a reason for vented soffits and either vented ridge caps or roof vents of one type or another.
The attic should be as near the outdoor temperature as it can get, even in small spaces between rafters or trusses created by a cathedral ceiling.
It is akin to the requirement (around here anyway) that a house must be able to have three complete air changes per hour by some means whether mechanical or not.
You can gain that air change by leaving a window or two open a hair.
You can also achieve that by running a bathroom and/or kitchen exhaust fan almost constantly.
Or you can go the most economical way and have an HRV system installed. Up here where we get about eight months of heating seasons and two or three months of hot weather and two or three months of something in between the HRV is the best scenario.
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