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SUBJECT: RE: Vinyl Windows v. Stucco
DATE: 4/12/2000 12:56:00 PM


1. To determine compatibility of
materials you can compare the materials
coefficient of expansion. Vinyl does
expand/contract more than stucco.

2. A number of vinyl windows utilize a
nailing flange. The hollow core of the
vinyl extrusion is designed to weep to
the exterior of the nailing flange.
Since the window is installed prior to
the installation of the exterior
cladding (siding, stucco, eifs, etc.),
the flange is nailed into substrate
behind the building's exterior cladding.
Moisture will, therefore, be deposited
behind the cladding.

3. Proper application of
asphalt-saturated building paper,
housewrap, or other acceptable drainage
layer should prevent damage to your wall
assembly if the exterior cladding
incorporates a way for moisture to exit
the assembly.

4. Sto makes a
product called SillSentry that is a
plastic product installed under a window
sill. The product is primarily used to
retrofit homes clad in barrier EIFS. It
diverts moisture that penetrates the
wall system at the particular location
back to the exterior of the cladding.



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