Condensation on Metal Roofs
To the Editor:
The article "Installing Metal Panel
Roofs" by Chad Taylor (5/00) was
informative and interesting. In many
years of building additions and remodeling
in the Northeast, I have been
interested in problems related to moisture
entrapment and inadequate ventilation.
The company featured in the
article, with nearly 40 years' experience,
has obviously been doing its
work satisfactorily. However, while
their practice of installing roof panels
directly over asphalt felt may be appropriate
in Florida, it may not be applicable
to northern climates.
Condensation on the underside of roof
panels from moisture entrapment and
wide daily and seasonal temperature
variations may result in corrosion and
eventual perforation from underneath.
Recommendations I have encountered
call for the installation of