Earthquake Retrofitting | Foundation Repair Company in OR and WA | Terrafirma


Homeowners in Washington and Oregon – a seismically active region – face the very real threat of an earthquake. Many of the homes in the Pacific Northwest were not built to current seismic codes. Even a minor seismic event could cause your home to shift off the foundation leaving the structure severely damaged and unsafe.

Reasons to
retrofit your home

  • You reside in a high-risk, active seismic zone.
  • Improve your home’s ability to act as a shelter after an earthquake.
  • Can potentially reduce earthquake repair costs, insurance premiums, and deductibles.
  • Could qualify you for earthquake insurance if your home isn’t currently eligible.
  • Retrofitting your home can potentially reduce earthquake insurance premiums and deductibles-or qualify you for earthquake insurance if your home isn’t currently eligible.
tf seismic zone 1 retrofit
tf earthquake common signs retrofit

What are common signs of earthquake vulnerabilities?

The following are the most common home issues to look out for in Portland, Salem, Roseburg, and the Seattle-Tacoma areas:

tf unreinforced brick retrofit
Masonry like brick, tile, adobe, or decorative rock must be reinforced with bracings like rebar to withstand an earthquake. Unsupported load-bearing walls, exteriors, and other structures like chimneys are especially vulnerable to collapse.
Unreinforced Brick or Concrete Block
tf cripple walls retrofit
Cripple walls are short, vertical wooden boards that support the floor. In an earthquake, unreinforced cripple walls can sway from side to side or cause the house to fall. Expansion bolts, framing anchors, and foundation bolting can prevent a cripple wall from collapsing.
Cripple Walls
tf lack of sheathing retrofit
Sheathing is a layer of plywood that is nailed over the studs of your home, providing a solid surface upon which to nail tar paper, shingles, and siding. In addition to providing much-needed insulation, sheathing keeps the building from shifting in an earthquake.
Lack of Sheathing
tf unsecured foundation retrofit
When a home is not secured, an earthquake can cause it to slide off its foundation, rupturing gas lines, causing fires and other structural damages. A quick visual inspection can often reveal whether your home is secure: Look out for thick bolts and anchor plates that connect the frame to the concrete foundation in your crawl space or basement.
Unsecured Foundation
tf unsecured appliances retrofit
Appliance feed lines are particularly susceptible to breakage when unsecured equipment moves during a quake. Strapping your water heater to the wall or floor, and installing seismic protection for your gas meter can go a long way toward minimizing damage.
Unsecured Appliances
efflorescence small retrofit
Do you think something could be wrong with your foundation? Take a walk around the perimeter of your home. Do you see numerous small cracks in the foundation, or maybe even large ones? Is the concrete flaking off or crumbling in certain places?
Foundation Problems

Schedule your free
Earthquake Evaluation

Schedule your free
Earthquake Evaluation


Homeowners in the Pacific Northwest know we live in an active seismic zone.
A little preparedness will go a long way to protecting your home and your family in the event of an earthquake.


Don’t take our word for it – see what our clients have to say.
From Roseburg to Eugene, Portland to Seattle, our earthquake retrofitting work speaks for itself

Seth with TerraFirma came out to look at my problem. He wasn't able to help with my issue but was very friendly and helpful to guide me to who to call. Was on time for our meeting and gave me a call to let me know he was on the way. All in all I'm very happy with TerraFirma and Seth. Thank you!
Very happy with the entire process. Someone was available to give us a bid, complete the job, and follow-up in a timely and professional manner. Very impressed!
We had mold issues under our house. TF was chosen to encapsulate the crawlspace, remove insulation and put in a dehumidifier. The job was difficult due to more dirt removal required than anticipated. The field team was excellent. They worked extremely hard, were neat and very friendly. They did a terrific job in a difficult situation. TF gave us a date for the work and arrived as planned and stayed on the job until completed. They dealt with us honestly and with integrity. Very satisfied with the solution, the results and the process of working with TF.
TerraFirma responded quickly to our call. Came out for a free evaluation of our foundation . Seth was very friendly, professional, and obviously well knowledgeable about his trade. Within 2 hours we had a very thorough assessment of our foundation. Thank you TerraFirma, and Seth.
1. Foundation pier support - appears to be good work. 2. Earthquake retrofit - less than perfect on cutting into living spaces to attach hardware -...
Our basement waterproofing job was completed on schedule the crew was professional and easy to work with. When we have other foundation or concrete work to be done TerraFirma will be our first choice. Jonah was a good coordinator and everything went smoothly,
Seth from Terra firma is great I highly definitely recommend him. Thank you
One more review for these guys… Roberto returned to finish up a few things and as before, he was professional, conscientious, efficient, and left the place immaculate. Love our basement - thank you so much!
Would highly recommend these fellas. Had two separate guys out to our place (Sam, and Tulane), and they both killed it. They gave us total peace of mind in moving into our new home. They assured us that there was a solution to our foundation problems and gave us an excellent quote on the project. Definitely planning to go with these guys for this project.
Terra Firma is a great company.
We live in Brookings Oregon and it took a little while to schedule what we needed done.
Kara in customer service project manager kept me informed month-to-month when scheduling would be done.

They showed up on time very professional great attitude work ethics and clean up I would highly recommend this company to anyone that has any foundation needs of any sort.

Thank you Terra Firma and Kara for jobs well done.

Don and Charmaine Bradley


How can I assure my home IS ready for an earthquake?