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On
sound wood siding, however, these great heavy acrylic
coatings are being used and the jobs are failing often. At
first glance, adhesion deficiencies seem to be the reason
for the failures. This is not the reason that many of the
jobs fail in two to three years after application. The very
high quality nature of the coatings is the reason for their
demise.
An
envelope is created when a heavy acrylic is applied onto the
exterior of a building. This envelope that is applied to
the exterior of buildings becomes a monolithic wrapping,
sealing in any hope for moisture pressure to escape from the
inside of the outside. In the Northeast, winter residential
interior pressures are intense and with the heated air comes
moisture vapor. Interior, moisture laden air can easily
penetrate walls, insulation and wall sheathing, etc. The
moisture often finds its way through the siding and to the
back-side of these new acrylic envelopes. As the moisture
condenses, water accumulates and the pressure of changing
exterior environments causes a percolation effect that
separates the acrylic envelope from the substrate (siding).
With
all of the reasons being given for these failures, the
scenario described above holds more validity than any. With
many of the new products being advocated as the answer to
paint problems, a second look should be taken as to how the
products are applied.
We do
have the answer with our factory finishing system which
utilizes the finest acrylics technology can offer. When we
install our Fiber Cement pre-finished products, they are
fully cured and installed so as to allow full ventilation,
as well as true watershed. (See Photo below for diagram -
Also
this page for explanation and comparison to other types
of sidings) It is the Fiber Cement substrate, very
stable, pre-finished, and self ventilating which holds the
world’s best coatings, while still allowing moisture to
vacate during the winter months.
Truly, with the high cost of re-painting old substrates with
the promise of long lasting coatings, it is just too costly
to have a failure in several years down the road. When our
acrylics are factory applied to Fiber Cement Siding, fully
cured, and then installed by our professional installers,
you have a warranted, stable system that will last for many
decades.
We
also finish our very stable,
insect and rot resistant solid composite trim packages
in the same acrylics so that your home looks like a custom
carpenter did the job for many years to come.
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(Left) Diagram - Fiber Cement Siding allows interior
moisture laden air a means of escape. At every
panel, a horizontal lap allows air to carry vapor to the
outside.
(Below) New Acrylic Paint has formed an envelope
trapping moisture vapor and causing paint to fail. |
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