Crawl Space Repair — Why It’s Needed

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Home Energy magazine estimates that 40% or more of the air you breathe in your home came from your crawl space. The problem is, in many homes in the Portland area, the air isn’t good.


  • Dirt floors
  • Foundation vents
  • Foundation materials

Homes shouldn’t be built on dirt floors, but because of the expense of doing it other ways, builders continue to build on dirt floors to keep costs down.

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The earth holds ground moisture

Wood holds moisture

When your home breathes (when temperatures go up and down) it sweats. The sweat is absorbed by insulation, wood beams, wood joists and foundation materials


The relative humidity of air goes down by 2.2% for every degree we heat it up and for every degree we cool it down. This is on TOP of the ground water, any sitting water that is evaporating or any water getting in from leaks.

On an 84° day with 75% relative humidity the air entering the crawlspace where the temperature is only 62° will have an increase of relative humidity of 48.4% (2.2% for every degree dropped) Add that to the current relative air humidity of 74% and you now have 123.4% relative humidity! Since air can only hold 100%, the rest must come out, either in rain or sweat. Since it doesn’t rain in a crawlspace, it sweats. Your walls, wood, and insulation all get wet and stay wet.

Over time this creates a great home for pests, mold, rotten wood and bad air. This environment damages your home at it’s very core, from the inside out and creates bad air that you now breath. The worst part is, most people don’t know or choose to ignore it until it’s a crisis!

The good news is that waterproofing a crawl space can solve this problem. Visit our Services page to find out how!