In homes without basements, the crawl space is the empty space under the building between the ground and the first floor. They’re called ‘’crawl spaces’’ because they’re just big enough for someone to crawl around in, but not stand up.
The role of a crawl space is to keep the home off the ground. It’s also where you’ll usually find wiring, plumbing, and the home’s central air conditioning system.

Causes Of Crawl Space Foundation Problems

Bay Area Underpinning
We’ve inspected many homes that had signs of settlement  – cracked walls and misaligned windows and doors – even though the foundation was level. This usually happens for the following reasons…
  • The interior crawl space support posts have settled. This is often because they were installed in problematic soils that experience a lot of seasonal movement. For example, expansive clay soil.

  • There is poor drainage around the exterior of the home which allows water intrusion into the crawlspace. This softens the soil supporting the pier blocks.

  • The existing screw jacks were installed incorrectly at grade level and have no corrosion protection. This allows moisture contact and deterioration of the screw jack base.

  • There isn’t enough support.  Sometimes, the original design didn’t provide adequate support for the floor. If so, more support may be needed. 

Both will cause your interior floors to settle or sag. You might notice that the floor squeaks or feels spongy as you walk on it. You might also notice that your furniture seems to shake as you walk by.
Whenever a crawl space starts to settle or sag, the building is in danger. 
The main causes of crawl space foundation problems are…
image of a crawl space