- Yes. A properly constructed SIP home has a
very low air infiltration rate. That's great for reducing heating and
cooling costs, but it isn't always healthy for the home or its
occupants. We strongly recommend that a whole-house ventilating system
be installed at the time of construction, and certainly before the first
heating season. New homes are filled with new materials and many of
those new materials - whether construction products, furnishings or
finishes - will out gas various pollutants. Emissions will decrease with
time - many products are stabilized within 6 months of manufacture -
but extra ventilation may be needed in the meantime.
- The substance that is released in the greatest quantity is
water, especially from masonry and the lumber. The materials in the
average home contain thousands of gallons of water, which must
eventually be removed from the house. The first heating season is
typically when the greatest amount of moisture is driven from the house.
The first heating season begins as soon as the house is closed to the
winter during construction. One telltale sign of lack of adequate
ventilation can show up in the form of heavy condensation on windows, or
in the ridging of asphalt shingles or in telltale frost or ice at
leakage points. Left unchecked, this moisture can produce mold or mildew
and can eventually cause serious damage to your home and its contents.
- Ventilation is important even after the home and its contents
have stabilized. Significant "indoor pollution" is produced by everyday
activities such as cooking, cleaning, bathing and even breathing. It is
wise to monitor indoor humidity levels for they are a general indicator
of indoor air quality. Most building scientists today recommend that
interior humidity levels be maintained at a range of 30% to 50% to
minimize health and structural problems.
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