Homeowners and designers often desire cathedral or vaulted
ceilings because of their aesthetic appeal and added height to a
given space. But if a home is located in a heating climate
zone—where a building's interior generally is heated for a
longer portion of the year than it is cooled—problems such as
ice damming may arise because cathedral ceiling roof systems are
difficult to ventilate.
However, there are ways to achieve proper ventilation and
minimize ice dams' effects.
A cathedral ceiling is considered a compact, or "warm," roof
assembly, which means each roof system component is in direct
contact with the preceding component; therefore, there is no attic
space between the ceiling and roof deck. These types of roof
assemblies present particular ventilation problems, especially in
heating climate zones. The problem most associated with
unventilated, improperly insulated cathedral ceilings in
Log in or register for FREE access to this article and other Professional Roofing online content.