|
INSTALLATION
Weather-resistive barriers require thorough, comprehensive integration
with other building envelope elements to retain system integrity.
Flashing and other components, including windows, doors, attached
decks, and band joists, usually present the most difficulty. Expert
supervision by a knowledgeable person can foster proper field
installation. While some general installation guidelines are outlined
here, it is essential to accommodate regulatory and product manufacturer
procedures. The approach used to install an appropriate weather-resistive
barrier is dependent on why it is being used. If intended only
to resist water entry, a weather-resistive barrier must be properly
lapped and integrated with other flashing—taping of all
seams is not critical. If it is used to reduce air infiltration,
all seams and edges must be sealed with compatible tape or sealant.
Suitable attachment of the weather-resistive barrier to the sheathing
is important. Wide-crown staples, nails with a large head, or
nails with a large plastic washer are recommended for woodframe
construction. Distance between fasteners is specified by the manufacturer
or by codes, but 12 to 18 inches is typical. When installing a
weather-resistive barrier, especially building paper, remember
that materials higher on a wall should overlap materials lower
on the wall—consider the path that a drop of water would
take if impacting the top of the wall and running downward. Water
may also be driven sideways or even upward for a distance by wind
pressure. Therefore, laps must be of sufficient length to prevent
water entry—4 to 12 inches of overlap is typically recommended.
Material should also extend around corners by 6 to 36 inches.
Housewrap installation may be eased by attaching the material
to walls before standing the walls up—just leave sufficient
additional length at all sides for later overlaps. This approach
improves speed and safety, and results in a more wrinkle-free
application (wrinkles can impede drainage and hinder cladding
application).
To maintain a continuous air retarder around the building envelope,
housewrap should cover the seams between framing members (e.g.,
between bottom plate and foundation). This may be accomplished
by incorporating housewrap into the framing or by adhering housewrap
continuously across the assembly. Overlap and seal all seams,
and seal penetrations in the housewrap. Tape is usually used to
cover seams, while sealant is used where tape may not provide
sufficient adhesion, such as sealing to wood or concrete. Use
manufacturer-approved tapes and sealants, not generic tape such
as duct tape.
Next:
DETAILS FOR WINDOWS AND DOORS
Energy
Efficiency Articles
Hardwood
vs Laminate
The difference is more than you think, or maybe not!
Good
Carpet is best!
There is nothing like walking barefoot on great carpet
Caring
for Hardwood is easier than you think.
Just vacuum and you are done.
More
Articles...
|
