Angie: Is it OK to install a new roof while itís
raining? Iím having a new roof installed over 20-year
old (Oriented Strand Board) sheathing. It started
raining during the install. Good news is that they did a
section at a time, so the OSB was exposed to fairly
light rain/drizzle for about a half hour before peel and
stick membrane was installed. Is that a problem?
Sailor: A reputable contractor keeps tabs on the
weather and wonít begin installing a roof if itís
raining or expected to rain. Doing so puts workers at
risk of falling off a wet roof and unnecessarily exposes
your home to damage for which they may be held liable.
doesnít mean that an unexpected rain or drizzle, as
you indicated, wonít occur during the roof
replacement. If it starts to rain or drizzle, the
roofers should act quickly to cover your OSB ó most
likely with a tarp.
of the roofing pros we spoke with says mist wonít
affect OSB any more than the humidity that OSB absorbs
on a hot day. OSB isnít extremely sensitive to small
amounts of water because resin and wax is manufactured
into the layered product. Also, the edges of the panels
are treated with a sealant to resist moisture
on the roof ó watch out for wet or wrinkled decks
said, pros say a new roof should never be installed over
wet wood or a wrinkled barrier. Doing so goes against
the building codes in most communities and the shingles
a roof deck is exposed to water and absorbs enough to
swell, it should be allowed to dry out before any
roofing material is applied to avoid trapping moisture
under the roof material that could cause the edges to
swell or buckle.
your contractor discovers damaged decking while
installing your roof, it should be sanded or replaced
before the new roof is applied. They should also make
sure to properly vent the roof.
before you hire a roofing contractor
many states donít require roofing contractors to be
licensed, experts recommend checking your local building
codes or meeting with a building inspector before hiring
a roofing contractor. Read reviews on Angieís List to
find an experienced roofer who does quality work and
carries liability insurance. Before you hire anyone, ask
what precautions the roofer will take if it starts to
rain when they are installing the roof and come to an
agreement before the job begins.