Concrete Repair Contractor
in Seattle, WA

The key factors we evaluate are: the depth and pattern of cracking (surface cracks differ fundamentally from through-cracks with vertical displacement), the condition of the subgrade (stable subgrade supports repair; actively settling or eroding subgrade usually requires addressing before either repair or replacement), the percentage of area that is delaminated or spalled (resurfacing becomes impractical when delamination exceeds 50 to 60 percent of the area), and the age and exposure history of the concrete. In general, concrete with sound structure beneath surface damage is an excellent repair candidate; concrete with compromised structure, heavily corroded reinforcing steel, or severe subgrade failure is more likely to require replacement. We will give you an honest assessment—we do not push replacement when repair is the right answer, because our reputation is built on accurate diagnoses, not maximizing project size. Call (206) 495-0997 for a free evaluation.

The primary cause of concrete spalling and scaling in Seattle is freeze-thaw cycling combined with water infiltration into an inadequately air-entrained or unsealed surface. When water enters porous concrete and freezes, it expands by approximately 9 percent and generates internal pressure that exceeds the tensile strength of the cement paste, mechanically fracturing the surface layer. This process repeats with each freeze-thaw cycle until the surface layer delaminates and spalls away. Contributing factors include the use of concrete mixes without air entrainment (common in concrete poured before modern mix design standards were widely adopted), application of deicing salts that accelerate the degradation of the cement paste surface, and failure to seal the concrete surface to limit water absorption. Much of the spalling we repair in Seattle's older neighborhoods—Wallingford, Fremont, Ballard—is on concrete from the 1950s through 1970s that was poured without adequate air entrainment for Seattle's climate.

Whether a concrete crack repair is permanent depends entirely on whether the crack is static or active, and whether the underlying cause of the crack has been addressed. A static crack—one that formed during initial concrete shrinkage or from a one-time loading event and has not moved since—can be permanently repaired by injecting with rigid epoxy, which restores tensile strength across the crack plane and prevents water infiltration. An active crack—one that continues to open and close with seasonal temperature changes or ongoing subgrade movement—cannot be permanently repaired with a rigid material; it must be treated with a flexible sealant that accommodates the ongoing movement. Cracks caused by ongoing subgrade settlement, tree root intrusion, or inadequate joint spacing will continue to propagate until the underlying cause is corrected. Our repair process always begins with root cause diagnosis for exactly this reason.

As a general rule, high-quality concrete repair costs 30 to 60 percent of replacement for the same area, making it the economically preferred option when the underlying slab is structurally sound. For a typical residential driveway with surface spalling and minor cracking, a complete shot-blast preparation and polymer-modified overlay repair system runs significantly less than a full tearout and replacement pour. However, the cost calculus depends heavily on the damage severity and root cause: extensive structural deterioration, heavily corroded reinforcing steel, or subgrade failure can shift the economics toward replacement. We provide detailed, itemized proposals that explain exactly what we are doing and why, so you can make an informed decision about repair versus replacement with full cost transparency. Deferred repair is almost always the most expensive option—concrete damage progresses, and what costs $3,000 to repair today may cost $15,000 to replace next year.

We manage repair scheduling and techniques to accommodate Seattle's wet climate, but we do not apply repair mortars or epoxy systems to saturated concrete or in active precipitation. Most concrete repair materials have minimum substrate moisture requirements: cementitious mortars can tolerate saturated-surface-dry (SSD) conditions, while epoxy primers and coatings require a dry surface with moisture below specified thresholds. During Seattle's rainy season, we schedule work during dry periods in the forecast, tent work areas for rain protection when necessary, and use heaters and dehumidifiers to dry surfaces that are wet from recent rain before applying moisture-sensitive materials. Winter repairs in Seattle are entirely feasible with proper temperature and moisture management—we use fast-setting, cold-weather polymer-modified mortars and heated enclosures when ambient temperatures are below 40 degrees Fahrenheit, ensuring proper curing even in challenging PNW winter conditions.