Moisture Problems Attic Ventilation Here aresome tips on
diagnosing and correcting moisture problems. Parts of this
story: ~~Introduction~~ Attic andmechanical ventilation ~~
Houseson crawl spaces and other moisture sources ~~ Caulkingand
weather-stripping ~~ Basementwall condensation problems Adequate
natural ventilation is important in the attics of homes. If a
vaporretarder is not present in the ceiling to slow migration of
moisture from thehome's interior into the attic, attics require
1 square foot of free vent areafor each 150 square feet of attic
area. An exception occurs when the attic ventsare located in a
high/low configuration (i.e., half of the vent area in
theeave/soffit area and the other half in the roof ridge area).
In that case, 1 square foot for each 300 square feet is
adequate. If a vaporretarder is present in the ceiling, attics
require 1 square foot of free ventarea for each 300 square feet
of attic area. A number of types of vents are available to
provide attic ventilation. As withcrawl