Letters
Battle of
the Ridge Vents
To the Editor:
In the article "Insulation and Ventilation:
One Architect's Approach"
(NEB, 8/86), the author states that
the roof-venting problem has been
solved by a product called "Cor-AVent."
Two tests, however, throw a different
light on this product, and might
dampen his enthusiasm. One test,
conducted by American Filter Co. in
Louisville, Ky., found that Cor-AVent
offered up to 2½ times the
resistance to airflow of standard
metal ridge vents (when tested at 12
mph of airflow). Good airflow is very
important in winter when coldclimate
houses need ventilation to
remove moisture and prevent ice
dams.
The other test, conducted by Construction
Research Laboratory, in
Miami, Fla., showed very high water
penetration with Cor-A-Vent at 50
mph airflows. At