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Structural Wood Repair · Moline, IL
Sagging Floor & Wood Repair in Moline
Sagging, sloping, or bouncy floors in Moline usually mean a failed joist, beam, or support below. We find the real cause and fix it for good.
Why It Sags
Why Moline Floors Sag — and How We Fix Them
In Moline’s century-old homes a sloping or bouncy floor is almost always structural: a rotted joist, an undersized beam, a deteriorated sill plate, or a settled support post. Jacking it without fixing the cause just delays the problem. We diagnose what actually failed and repair the structure so the floor stays level for good.
What We Do
What We Repair Below the Floor
Floor Joist Repair & Sistering
Reinforcing or “sistering” cracked, sagging, or undersized joists, and replacing those that are too far gone.
Beam & Girder Replacement
Replacing failing main beams and girders, and adding properly sized support where the original was undersized.
Sill Plate & Rot Repair
Cutting out water-damaged sill plates and rotted framing and rebuilding with treated, properly flashed material.
Support Posts & Jacks
Adding or replacing support posts and adjustable columns on proper footings to carry the load and re-level the floor.
Root Cause
Often It Starts With Water
Our Philosophy
A surprising amount of structural wood damage traces back to moisture — a wet crawl space, poor drainage, or a foundation leak quietly rotting the wood above it. We look for that root cause so the new framing doesn’t end up failing the same way. Sometimes the real fix is drainage or waterproofing →
— Behncke Construction · since 1948
Floors sloping or bouncing?
We’ll get under the floor, find what’s actually failing, and recommend the repair that fixes it for good — with a written estimate, usually within one business day.
Related Pages
The fix is completely different depending on the cause
Soft, damaged wood gets blamed on termites, but here it’s far more often water rot or simple age and overload. The repair changes entirely with the cause. We identify what actually damaged the wood before deciding how to fix it — guessing wrong wastes your money.
Your next step
“What damaged my wood in the first place?”
Diagnose before you repair:
- Wood & floor repair — telling rot, age, and overload apart
- Get an inspection — find the real cause first
Real customers · real reviews
What Quad Cities homeowners say
“We had our basement joists replaced. Reasonable quote, booked in a timely manner, great communication with expectations and the contract. We could park a semi on our new floors. The owner was a doll.”
“Behncke built an egress window for our home. From the initial scheduling through the conclusion everything was precise and the craftsmanship was perfect. We would highly recommend Behncke for your every need.”