The Moisture Problem in Crawlspaces

To most people's surprise, what's in the crawlspace is also in the house! We find that most crawlspaces are connected to the living space via holes, cracks, and gaps that allow crawlspace air to enter your home, introducing contaminants and decreasing air quality.

Unsealed crawlspaces are also the main source of high moisture levels in the home. In many cases, the home's ductwork is located in the crawlspace. Leaks in this ductwork can actually vacuum the crawlspace air up into the house, every time the system turns on.

A - Roof runoff and improper grading allow water to collect where it can enter the crawlspace through cracks in the foundation walls. Functioning gutters and a finished grade that slopes away from the house ensures bulk moisture is kept out of the crawlspace.

B - Crawlspace dampness can breed fungi in living spaces. A dry crawlspace helps ensure a dry and healthy living environment.

C - Humid summer air enters the crawlspace through foundation vents and condenses on cool surfaces. When the vents are sealed, the moisture levels inside the crawlspace can be controlled with a dehumidifier.

D - Moisture and radon rise through the soil into the crawlspace, and ultimately into the living space. By installing the Healthy Crawlspace liner with 100% coverage, all moisture vapor is kept out of the crawlspace, enabling complete control of relative humidity levels.

 

Crawlspace Concepts:

- The Moisture Problem
- Air Leakage Delivers Pollutants
- Every Crawlspace is Unique
- NC Crawlspace Building Code
- New Construction Crawlspaces

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