Existing Customers Schedule Service

We're Hiring! Join Our Team

Pay Your Bill Online Pay Now

About TerraFirma

The 5 Don'ts to Repairing Your Crawl Space

Sunday, February 23rd, 2020 by CJ Garcia

The 5 Don\'ts to Repairing Your Crawl Space - Image 1

Your crawl space plays a crucial part in the comfort of your home. Damp moist air trapped in your crawl space can breed mold and affect your foundation. Musty smells can find their way into your living spaces. Local pests and bugs will find it a refuge from the outside elements and move right in.

It's important to choose the right approach when fixing your crawl space. Crawl spaces are complex environments and the wrong approach can exacerbate the problems you're trying to solve. That gets costly and time-consuming.

Here are some examples of mistakes to avoid when fixing your crawl space:

1. Don’t install vents

The theory behind adding vents in a crawl space is that more vents will force more moisture out. But it turns out that additional vents do a better job of ushering in humid air during times of high humidity, doing more harm than good when the goal is to maintain a clean, dry space under your home.

More vents also mean more ways for pests to enter the space.

2. Don’t use spray foam in a damp crawl space

While spray foam insulation is one of the most effective insulation materials in other rooms of the home, it is a bad idea in a wet or damp crawl space. Moisture gets easily trapped between the foam and the wall and a moist foundation wall generally leads to mold growth and wood rot.

Mold and rot? Never good for your home's foundation.

3. Don’t insulate a damp crawl space with fiberglass

Insulating damp crawlspaces with fiberglass is another common mistake. Fiberglass insulation absorbs moisture. When that happens, the crawl space becomes an even more hospitable environment for mold growth.

Fiberglass's moisture-absorbing properties make it an ineffective solution.

4. Don’t add vapor barriers to floor joists

Another crawl space repair tactic is to install vapor barriers to floor joists to keep moisture from seeping into the wood joists. The problem here is that in summer months, condensation in the crawlspace gets trapped between the joists and the vapor barrier. And as with spray foam, this can encourage the mold growth and wood rot that you're trying to eliminate.

Avoid condensation at all costs.

5. Don’t skip the drainage system

Drainage issues are common with both dirt and concrete crawl spaces. Once rainwater and groundwater seep (or gush) in, it's dangerous to let the water stand or let the crawl space "air out" on its own (meaning let the wooden structures absorb the moisture). An effective drainage system will take into account the type and slope of the crawl space floor, the foundation and drainage outside and will often include a sump pump and dehumidifier designed for the crawl space.


Selecting the right crawl space solution and a professional contractor experienced in crawl spaces will save you time, headache and money. Let us turn your crawl space into a worry-free zone. Call TerraFirma today to schedule your free evaluation! 

our service area

We serve the following areas

  • Adams
  • Adrian
  • Arock
  • Athena
  • Baker City
  • Bates
  • Bridgeport
  • Brogan
  • Burns
  • Cove
  • Crane
  • Drewsey
  • Durkee
  • Elgin
  • Enterprise
  • Haines
  • Halfway
  • Harper
  • Helix
  • Hereford
  • Huntington
  • Imbler
  • Imnaha
  • Ironside
  • Jamieson
  • Jordan Valley
  • Joseph
  • Juntura
  • La Grande
  • Lostine
  • Meacham
  • Milton Freewater
  • North Powder
  • Nyssa
  • Ontario
  • Oxbow
  • Pendleton
  • Pilot Rock
  • Prairie City
  • Richland
  • Riverside
  • Summerville
  • Sumpter
  • Ukiah
  • Union
  • Unity
  • Vale
  • Wallowa
  • Westfall
  • Weston
Our Locations:

TerraFirma Foundation Systems
761 NE Garden Valley Blvd.
Roseburg, OR 97470

TerraFirma Foundation Systems
13110 SW Wall St
Portland, OR 97223

TerraFirma Foundation Systems
10111 S Tacoma Way D5
Tacoma, WA 98499

TerraFirma Foundation Systems
2001 NE 117th ST
Vancouver, WA 98686
Unable to process this phone number