Why should you seal your crawl space?

One of the longest debates with crawl spaces is whether to vent or seal a crawl space. Vented crawl spaces worked great until the invention of air conditioning. When a family cools their home to 70° during the summer and the air outside is 85° with a humidity, it creates condensation on floor joist, insulation, pipes, and ducts. No amount of ventilation will solve the problem at this point. This constant condensation during the summer months causes wood rot, mold, and attracts all types of insects and rodents.

The common symptoms of a crawl space moisture problem are:

  • Mold or moisture damage in your crawl space or living area
  • Musty odors in your living area
  • Condensation on insulation or pipes
  • Buckled hardwood floors
  • High humidity in your house
  • Insect infestations


Sealing your crawl space creates a clean conditioned space under your home and provides the following benefits:

  • Improves air quality throughout the home
  • Saves you money by keeping heating and cooling cost down
  • Reduces mold and wood decay on floor joist
  • Reduces buckling of hardwood floors
  • Creates warmer floors in the winter
  • Reduces pest and termite pressure

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