Technicians installing a crawl space vapor barrier.

Crawl spaces play a crucial role in the structural integrity and moisture management of a building. That’s especially true in regions like Michigan, where climate variations can be significant. For optimal internal climate control and moisture control, pay attention to your crawl space vapor barrier! If you are not experienced with this part of your property, we’re here to help. Read our FAQ to better understand our process, then get it touch to schedule an appointment!

What is the Code for Crawl Spaces in Michigan?

Michigan, like many states, adheres to specific building codes that dictate the requirements for constructing crawl spaces. The Michigan Residential Code outlines these regulations, including aspects such as ventilation, insulation, access, and structural integrity. The specific MRC requirement for crawl space walls is as follows:

“Where provided in lieu of floor insulation, insulation shall be permanently attached to the crawlspace walls. Exposed earth in unvented crawl spaces shall be covered with a Class I vapor retarder with overlapping joints taped.”

Do You Really Need a Vapor Barrier in a Crawl Space?

Yes! One of the critical considerations in crawl space construction is moisture management. Installing a crawl space vapor barrier such as polyurethane or foil helps prevent moisture from seeping into the crawl space. Keeping moisture out mitigates issues such as mold growth, wood rot, and eventual structural damage. Worse, a humid and unventilated crawl space without a vapor barrier can attract insects such as termites and mosquitos.

A good-quality vapor barrier, installed correctly, should last about 20 years before requiring repair or replacement. Of course, if the barrier and crawl space are exposed to harsh weather conditions that compromise their structural integrity (such as flooding or high winds) that time frame might shrink. Have your vapor barrier inspected if you believe it might have been damaged. When necessary, invest in repairs or replacement to prevent further property damage.

Contact Coastal Renew for Mold Solutions & Vapor Barrier Installation

Coastal Renew is here for all your polyurethane spray foam needs, from slab lifting and seawall soil stabilization to waterproofing and foundation repair. Based in Lansing and serving the Michigan region, we’re your first call for no-excavation property repairs and maintenance. Contact us at 866-302-7676 for a quote and to discuss your project!


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