Secure Your Crawl Space with TerraFirma

Crawl Space Dehumidifier Installation in Portland & Throughout Oregon and Washington

High-performance dehumidification & air filtration for your crawl space

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Humidity and condensation in a crawl space is a recipe for disaster. Excess moisture leads to mold growth, wood rot, and foul odors, causing issues for your home's health, air quality, and value.

At TerraFirma, we specialize in preventing these problems with our patented crawl space dehumidifier and ventilation fan. As part of our complete crawl space encapsulation system, these products will ensure that your home has clean, dry air and help protect your crawl space from mold and other damage.

If you've had issues with mold, wood rot, or other crawl space humidity problems, call us today at 1-844-311-8051 or contact us online to learn more about how we can help! We offer free estimates on all our work in Portland, Eugene, Medford and throughout the surrounding areas in Oregon and Washington.

How humidity affects your crawl space

the stack effect

This diagram of the stack effect shows how cool air is pulled in through the lower levels of your home (click to enlarge)

Homes have never been completely airtight structures, and over the years outside air is given more and more access through both the changes you've decided to make to it and the natural decay of building products. This allows humid air to get into your crawl space, where it inevitably condenses and begins to cause problems.

Warm air rises and exits through upper windows and the roof, creating a vacuum in your home. In below grade spaces, this void is filled with humid air drawn from the outside. Once in your crawl space, this air condenses and leaves standing water before it works its way up and out of the home. Known as the stack effect, this process will worsen over time and create mold and wood rot while hurting your energy efficiency.

At TerraFirma, we solve these problems with our crawl space encapsulation system and crawl space dehumidifiers. By sealing your crawl space off from the outside, we can create an environment that remains dry, clean, and healthy, as well as far more energy efficient.


Aprilaire Dehumidifier

Aprilaire dehumidifier

TerraFirma's Aprilaire dehumidifier removes up to 95 pints of water every day!

All of our Aprilaire dehumidifiers are designed and manufactured in the U.S. and built to last. Once TerraFirma installs your Aprilaire dehumidifier, you can rest easy knowing that your home is now protected from mold, mildew, odors, and humidity. To provide you with even more peace of mind, the Aprilaire is backed with a 5-year warranty.


SaniDry™ Sedona Dehumidifier

SaniDry™ Sedona Dehumidifier

The SaniDry Sedona offers giant performance in a small package. It's the world's most efficient, high-performance dehumidifier, without a bulky heat exchange core. The Sedona easily fits in small crawl spaces, yet has a powerful blower to effectively dry large crawl spaces. Mold and mildew are common in crawl spaces, but the Sedona keeps the relative humidity below 55%, so mold won't stand a chance. As a high-efficiency ENERGY STAR® certified dehumidifier, the Sedona removes more moisture (100 pints per day) for less electricity cost than conventional models.

The SaniDry Sedona dehumidifier drains automatically and has a humidity sensor that monitors the air, so once it's installed, there's nothing else to do. Your crawl space will be drier and healthier - and so will the rest of your home too!


Get a quality crawl space dehumidifier for your home today

If you've had issues with mold, wood rot, or rising utility costs, the experts at TerraFirma can provide you with a quality solution. We specialize in crawl space repair and encapsulation, and we know what it takes to prevent humid air and excess moisture from damaging your home.

Call us today at 1-844-311-8051 or contact us online to get a free estimate on a crawl space dehumidifier for your home. We install all our crawl space products in Seattle, Portland, Tacoma, Vancouver, Bellevue, Eugene, Renton, Hillsboro, Salem, Gresham and throughout the surrounding areas.

Looking for a price? Get a no cost, no obligation free estimate.

our service area

We serve the following areas

  • Adams
  • Adrian
  • Arock
  • Athena
  • Baker City
  • Bates
  • Boardman
  • Bridgeport
  • Brogan
  • Burns
  • Canyon City
  • Cove
  • Crane
  • Dayville
  • Diamond
  • Drewsey
  • Durkee
  • Echo
  • Elgin
  • Enterprise
  • Fields
  • Frenchglen
  • Haines
  • Halfway
  • Harper
  • Helix
  • Heppner
  • Hereford
  • Hermiston
  • Hines
  • Huntington
  • Imbler
  • Imnaha
  • Ione
  • Ironside
  • Irrigon
  • Jamieson
  • John Day
  • Jordan Valley
  • Joseph
  • Juntura
  • Kimberly
  • La Grande
  • Lexington
  • Long Creek
  • Lostine
  • Meacham
  • Milton Freewater
  • Monument
  • Mount Vernon
  • North Powder
  • Nyssa
  • Ontario
  • Oxbow
  • Paulina
  • Pendleton
  • Pilot Rock
  • Prairie City
  • Princeton
  • Richland
  • Riley
  • Riverside
  • Seneca
  • Spray
  • Stanfield
  • Summerville
  • Sumpter
  • Ukiah
  • Umatilla
  • Union
  • Unity
  • Vale
  • Wallowa
  • Westfall
  • Weston
Our Locations:

TerraFirma Foundation Systems
761 NE Garden Valley Blvd.
Roseburg, OR 97470
1-541-204-4660


TerraFirma Foundation Systems
10111 S Tacoma Way Suite D5
Tacoma, WA 98499
1-253-777-0712


TerraFirma Foundation Systems
7910 SW Hunziker St
Portland, OR 97223
1-541-229-4049
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