Why Concrete Sinks Faster on the Oregon Coast (& How to Fix It)
Why Concrete Sinks Faster on the Oregon Coast (And How to Fix It)
Living on the Oregon Coast offers incredible views, but the coastal climate is notoriously brutal on your property. If you own a home in Newport, Florence, Coos Bay, or Bandon, you have likely noticed that driveways, patios, and walkways seem to crack and sink much faster than they do inland.
While concrete is incredibly durable, it is only as strong as the ground beneath it. On the coast, the ground is actively working against you.
Here is why coastal concrete settles so rapidly, and why tearing it out to pour a new slab is often a massive mistake.
The Core Problem: Sandy Soils and Rapid Erosion
Inland areas like the Willamette Valley deal with expansive clay soils that swell and shrink. On the coast, the primary culprit is sand.
Sandy soil drains exceptionally well, which is great for preventing surface puddles. However, sand lacks the cohesive, binding properties of other soil types. It doesn’t hold its shape under pressure or heavy water flow. When intense winter storms and heavy coastal rains hit your property, the water runs off the edges of your concrete and seeps underneath.
Because the sandy soil is loose, it easily washes away with the runoff. Over time, this constant erosion creates massive, hidden voids beneath your concrete slabs.
The Weight of the Slab
Concrete is heavy. A standard section of driveway can easily weigh over a thousand pounds. When the sandy soil washes out from underneath it, the concrete is left bridging a gap it was never designed to span.
Eventually, gravity wins. The unsupported slab drops into the void, causing the concrete to crack, tilt, and create dangerous trip hazards around your property.
Why Replacing the Concrete is the Wrong Move
When a coastal homeowner sees a sunken, cracked patio, their first instinct is often to hire a contractor to tear it out and pour a fresh slab.
Here is the problem: Pouring new concrete does absolutely nothing to fix the sandy, eroded sub-base. In fact, you are simply placing a new, incredibly heavy piece of concrete right back on top of the exact same failing soil. After a few heavy winter rainstorms, the sand will wash out again, and your brand-new driveway will start to sink.
Poly Leveling: The Ultimate Coastal Concrete Fix
Instead of replacing the concrete, the permanent solution is to stabilize the sandy soil underneath it.
At Oregon Concrete Leveling, we use a process called polyurethane foam leveling (polyjacking). We drill penny-sized holes into the sunken slab and inject a high-density, structural polymer foam directly into the voids.
This method is uniquely perfect for the Oregon Coast for three reasons:
It Binds the Sand: As the two-part liquid polyurethane reacts and expands, it forces its way into the loose, sandy soil. It essentially glues the loose sand together, creating a hardened, stabilized base that can easily support the weight of the concrete.
It is 100% Waterproof: Unlike the surrounding sand, the cured poly foam is completely impervious to water. Once injected, it seals the sub-base. Heavy coastal rain and storm runoff will simply wash around it without eroding your newly stabilized foundation.
It is Lightweight: Poly foam is incredibly strong but weighs a fraction of what mudjacking slurry or new concrete weighs, meaning it won’t overburden the sensitive coastal soil.
Stop the Erosion Before It Spreads
Ignoring a sinking driveway or sloped patio on the coast usually leads to bigger problems. Pooling water against your foundation or extreme trip hazards on your walkways are liabilities you don’t need to live with.
If your coastal property is suffering from sinking concrete, we can help. Oregon Concrete Leveling provides fast, permanent, and waterproof structural lifting for properties up and down Highway 101.
Give us a call or text us today at (541) 671-7234 to schedule a free on-site inspection and get your concrete back on solid ground.
