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Crawl Space Insulation. Print Bookmark
About Crawl Spaces
Sealing Your Crawl Space
Crawl Space Insulation
Crawlspace Drainage
Crawlspace Vapor Barrier
Wet Basement
Crawl space is traditionally the most misunderstood part of your home. It encompasses many crucial building components of the foundation. A compromised crawl space endangers the structural integrity of the foundation system.

Damage occurs when the environment is moist, exposing joists, sill plate, support beams, subfloor, piers, block foundation walls, etcetera, to undesirable temperatures and water vapor levels.


Groundwater levels differ according to the amount of rain and snow received. These fluctuating levels are the crux of crawl space moisture problems. If the groundwater level remains near the crawl space grade, water levels can range from complete flooding to smaller areas of standing water.

However, crawl spaces can remain moist and damp without appearing muddy or wet due to a number of factors. The enclosed environment of the subsurface soil base, open-earth evaporation, elevation, topography, and exterior perimeter drainage, all contribute to the crawl space becoming very susceptible to mold, mildew, fungus, insect infestations, wildlife shelter, and other micro organisms.

Crawl Space Insulation Pointers.

•The climate you live in will determine the type of crawl space insulation options that are open to you.

•Your geographic location will also determine recommended minimum insulation R-value that should be applied.

•The general direction your house faces.

•The drainage around your home.

•Your local building code.


•The age of your home and the type of construction are important factors as well as and if wooden frame or metal frame has been used in construction. As your home is relatively new - does it have built-in insulation within the foundation walls.

•The condition and R-value of the present insulation and if it would be more cost effective to leave it in place
and add more to increase the insulation without over insulating and compressing the material.

•It is very important to know if the crawl space is ventilated or not - traditionally building codes required the installation of vents during home construction but in many areas this is now no longer the case and vents are being blocked.

There are two ways to find out - your local building office will be able to advise you - and a qualified insulation contractor will know the building code requirements for your home type in your area.

•Unventilated crawl spaces allow for insulation of the crawl space walls as an option to insulation suspended below above floor structure - but only if the space is dry throughout the year AND the floor above is not insulated.

•Do you have a durable vapor retarder like a thick polyethylene film properly installed on the ground area over all of your crawl space - this is a very important factor in reducing the amount of moisture that gets into the space.

•Spray foam insulation may also 'by code' require the additional installation of an air barrier.

•Get that valuable certificate proving insulation work done on your home.

Quality builders and concerned home owners use - Drain Master Plumbers on all their projects to ensure their
home have dry basements and crawl spaces!

Call today to have a Certified Technician solve your problems ----------------------------------604-739-2000.


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