Sagging Floor

Homes with crawl space foundations are popular in the south, midwest and west coast, where as many as 40% of homes are built with crawl space foundations. Unfortunately, as crawl space homes age it’s common to find sagging or uneven floors, cracked tiles or floors that creak. Over time the beams and wood frames or “stations” (located in the crawl space) supporting the floor can become damaged. Failing supports and/or piers can cause the floor to sag or bounce and compromise the structural integrity of the entire home.

More often than not, floors will begin to settle closer to the middle of a home. This is because the perimeter walls are constructed over the foundation and do not settle as much. The support posts or stations located inside the perimeter walls are more susceptible to movement.

A sagging floor in an older or even newer crawl space home is often a sign of a structural problem. If you can see gaps between the floor and baseboards or between the floor and the wall, it is likely that a sagging floor joist is the cause.

Sagging floor damageSagging floor joists can be fixed. However, the underlying problems should also be addressed to ensure a long-term repair.

House and foundation settling occurs in pier and beam or block and base homes when soil shifts. As expansive clay soils expand and contract underneath the home, it can cause foundation problems that lead to cracks in walls, sagging floors and other structural issues.

What Causes Floors to Sag or Bounce?

Failing support beams under crawl spaceAny crawl space home built atop clay soil can suffer from soil movement that adversely affects the foundation. Clay soils expand when saturated with excessive water and then contract when they dry. This continual swelling and shrinking exerts pressure on the foundation, which in turn can cause the piers and support posts to move, resulting in sagging floor joists. This leads to sagging floors and damaged flooring.

Unevenly spaced support pillars can also cause floor joists to sag. When the support pillars are not spaced correctly, the floor joists try to compensate causing the floor to sag and gaps to appear between the floor and wall or baseboards.

Crawl Space Moisture Problems

When the foundation cracks, moisture can enter the home. Moisture can seep into floor joists and weaken them. As a floor joist weakens, the flooring above can sag. Moisture also attracts insects such as centipedes, silverfish and millipedes.

Other negative affects of moisture include increased energy bills, strange odors and uncomfortable humidity in the living areas of your home. Excessive moisture can even lead to mold, allowing allergens.

suburban homeSagging floors can also be a safety hazard within the home — a trip hazard for the elderly, toddlers and anyone living with mobility issues. Uneven floors can also degrade the value of a home and will slowly cause the overall structural integrity of the home to deteriorate.

If the floors in your home are sagging, it may be time to consult a repair specialist. Olshan uses the SafeAdjust™ Support Column System to remedy most sagging floor problems. Support columns help provide reliable support beneath the crawl space, resolving the issue of sagging floors. For an even stronger repair, Olshan installs pilings underneath the SafeAdjust™ columns or existing stations to improve structural performance. This service is available as needed.

Depending on the severity of the damage, other repairs such as foundation pilings, drainage and air quality solutions may be recommended in conjunction with Support Columns.

How to Fix a Sagging Crawl Space Floor

support postsFor a comprehensive crawl space solution, Olshan offers the CrawlSafe™ System. CrawlSafe™ helps transform the dark, damp underbelly of a crawl space home and convert it into a cleaner, safer space.
CrawlSafe™ includes:

  • SafeAdjust™ Support Columns to stabilize sagging floors
  • Removing water using our Interior/Exterior Water Management and Waterproofing to improve structural performance over time
  • Installing an Air Exchange System such as a crawl space dehumidifier to improve indoor air quality
  • Encapsulating the crawl space using moisture resistant SafeSeal™ liner to deter pests and increase the longevity of the foundation

An Olshan Certified Structural Technician can help determine which products and services are right for your home and long term home improvement goals.