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What Happens When a Roof Doesn’t Have Proper Ventilation?
the most important aspects of the way your roof is designed and built is proper
ventilation. You simply cannot over-estimate its importance. What happens when
a roof doesn’t have proper ventilation? Improper ventilation allows formation
of condensation, moisture accumulation, and damage to the roof deck and,
eventually, to the stability of the roof. Improper roof ventilation can also
affect the health of your family.
industry standard for roof ventilation to provide 1 square foot of intake
ventilation and 1 square foot of exhaust or outflow ventilation for every 300
square feet of attic space, provided the area is insulated with a vapor
barrier. If the area is insulated without a vapor barrier, the requirement
ventilation of the roof and attic
of a home achieves several important functions:
makes the attic space cooler
makes the home more energy efficient
prevents condensation and accumulation of moisture on the inside of the roof
deck, and prevents rotting of the roof deck
reduces the risk of fire
Several types of vents can be used to properly ventilate the roof of your
home. Roof ridge vents are placed along the ridge line of the roof.
Ridge vents are used for exhaust or outflow of moisture, heat, and stale air.
Soffit vents and Eaves are placed at the lower extremes of the roof
and provide the intake ventilation. If you live in an older home, your roof
might not be constructed for roof ridge or soffit vents. Older homes were not
built with the tight seals of today’s houses. There were cracks and openings
around windows and doors, chimneys and other openings. These cracks and
openings allowed fresh air to flow into the house. On the principle that hot
air rises, the accumulated heat and moisture would rise to the attic and out the
Without adequate ventilation, moisture rises with the hot air and forms
condensation on the inside of the roof deck. This moisture is released into the
air inside the house from bathing, cooking, plants, laundry and other causes.
When the condensation forms on the roof deck, it begins to rot the wood. This
introduces mold spores into the air, as well as damaging the wood. The result,
if the problem is not noticed and repaired, can be destruction of all or part of
the roof deck and creation of unhealthy air inside the house.
increasingly airtight homes, the importance of proper ventilation in
roof construction cannot be
over-emphasized. It is important to take the time and do the research to
understand the ventilation needs for your home in your region and how best to
meet those needs.
If you are looking for a Los Angeles Roofing Contractor please call us today at 800.647.7663 or complete our online service request form.
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