Finding a crack in your foundation wall is unsettling. It raises immediate questions: is this structural? Is water getting in? Will it get worse? In most cases, the answer to all three is: it depends on the type of crack, and it needs to be evaluated before the next rainy season makes it worse.
At Better Basement and Waterproofing, we inspect and repair foundation cracks throughout Portland, Eugene, and Vancouver. We use polyurethane and epoxy injection methods to seal cracks permanently from the inside, stopping water entry and preventing the crack from growing.
NOT ALL FOUNDATION CRACKS ARE THE SAME
One of the most important things to understand about foundation cracks is that they are not all equal in severity. Some are cosmetic. Some are active water entry points. Some indicate structural movement that needs immediate attention. Knowing the difference helps you understand the urgency and the right response.
Hairline cracks in poured concrete walls are the most common type in Portland homes. They form as concrete cures and as the foundation settles over time. On their own they are not structural concerns, but they can become water entry points under the hydrostatic pressure that Portland’s clay soil creates during the rainy season. Catching and sealing hairline cracks early prevents them from widening.
Horizontal cracks in block or concrete walls are the most serious type. They indicate lateral pressure from the surrounding soil pushing inward against the foundation wall. In Portland, this is often related to saturated clay soil exerting sustained pressure over the wet season. Horizontal cracks require prompt professional evaluation and are typically addressed as a structural repair alongside waterproofing.
Stair-step cracks in block or brick foundations follow the mortar joints diagonally. They indicate differential settlement, parts of the foundation sinking at different rates. Like horizontal cracks, these need professional evaluation.
Vertical cracks in poured concrete walls are common and often the result of shrinkage as the concrete cured. They are rarely structural concerns on their own but are reliable water entry points under pressure.
Floor cracks, especially wide ones or those where one side is raised higher than the other, indicate significant soil movement beneath the slab. These need evaluation alongside the wall cracks.
If you are not sure which type you are dealing with, read our guide on the signs your basement needs waterproofing for a clear breakdown of what each warning sign means.
HOW WE REPAIR FOUNDATION CRACKS IN PORTLAND
Polyurethane injection
Polyurethane injection is the method we use most commonly for active water-leaking cracks. Polyurethane foam expands as it cures, filling the entire width and depth of the crack from inside the wall. It remains flexible after curing, which means it can tolerate minor ongoing movement without cracking again. This is particularly relevant in Portland, where seasonal soil expansion and contraction creates ongoing minor movement around foundations.
The process is completed from inside the basement. We drill small injection ports along the crack, inject the polyurethane under controlled pressure, and seal the surface. Most crack repairs are completed in a single visit.
Epoxy injection
Epoxy injection is used for cracks that need structural reinforcement rather than just waterproofing. Epoxy cures to a rigid bond that is stronger than the surrounding concrete. It is appropriate for cracks where the concern is structural integrity rather than active water entry. We assess each crack individually and recommend the right method based on what the crack is doing and why.
Surface patching and hydraulic cement
For cracks that are actively leaking at the time of repair, hydraulic cement can be used to temporarily stop the flow before injection. This is a preparatory step, not a standalone solution. Hydraulic cement applied alone to an active crack will fail under continued hydrostatic pressure, it needs to be followed by injection for a permanent seal.
CRACK REPAIR AS PART OF A COMPLETE WATERPROOFING PLAN
Foundation crack repair addresses specific entry points, but it does not address the underlying hydrostatic pressure that caused the crack to leak in the first place. For most Portland homes with multiple cracks or a history of recurring water entry, crack repair is combined with an interior perimeter drainage system and sump pump for complete and lasting protection.
If the water intrusion you have noticed is coming from the cove joint rather than a specific crack, read our guide on why Portland basements get wet when it rains to understand the different entry points and what each one requires.
For a full picture of what basement waterproofing costs in Portland, see our complete cost guide.
Before signing with any Oregon contractor, verify their license at the Oregon Construction Contractors Board . We are licensed and you can check before committing.
WHAT TO EXPECT FROM A BETTER BASEMENT CRACK REPAIR
Free inspection and written estimate. We evaluate every crack, explain what type it is, what is causing it, and what the right repair method is. No charge, no obligation.
Licensed Oregon contractor. Every job is completed by our licensed crew.
10-year performance warranty. Our warranty covers the repaired crack staying sealed, not just the materials we used. Read more about what our warranty covers.
Before-and-after documentation. We photograph every crack before and after repair so you have a permanent record.
SCHEDULE YOUR FREE FOUNDATION CRACK INSPECTION
If you have noticed cracks in your foundation walls or floor, a free professional evaluation is the right first step. We will tell you exactly what type of crack you have, whether it is a water risk or a structural concern, and what the right repair looks like.
Schedule your free foundation crack inspection in Portland
Better Basement and Waterproofing serves Portland, Eugene, Vancouver, and surrounding communities in Oregon and Washington.
