Your House Sits on That Wood
Every floor in your home rests on joists, beams, and supports in the crawl space. When those stay dry, they last a century. When they stay wet, they rot. Wood rot is slow and quiet — it does not announce itself. The first sign is usually upstairs: a floor that sags, bounces, or slopes. A door that sticks. A crack in the drywall. By the time you feel it in the living room, the damage under the house has been growing for years.
Baltimore's old housing stock is full of this. A hundred-year-old rowhouse with a damp crawl space can have joist ends rotted soft where they sit in the foundation pockets. A 1960s rancher with a plumbing leak can have a whole section of subfloor turned to sponge. The good news: most of it is repairable. Wood can be sistered, reinforced, and replaced. Supports can be reset. What cannot be skipped is fixing the moisture that caused it — or the new wood rots just like the old.
The Repairs We Do
Sistering joists. When a joist is rotted or weakened but the damage is limited, we bolt a new joist alongside it — "sistering." The new wood carries the load; the old wood stays as a form. It is strong, clean, and far less disruptive than tearing out the old joist.
Joist and beam replacement. When damage is too far gone to sister, we replace the member. We support the load temporarily, cut out the bad wood, and set new pressure-treated lumber. Floors get jacked back toward level where possible.
Subfloor repair. Soft, spongy spots in the floor usually mean rotted subflooring. We cut out the bad sections and replace them, so the floor is solid again.
Support posts and piers. Sagging beams often trace back to failing supports — rotted wood posts, settled concrete blocks, or piers sinking into soft soil. We replace them with proper supports on solid footings, set plumb and level.
Rim joist and sill plate repair. The sill plate — the wood sitting directly on the foundation — is the first thing to rot when water runs down walls. We replace rotted sills and rim joists, which also lets us seal the air leaks at the same time.
Termite damage repair. Maryland has termites, and they love damp crawl space wood. If we find active termites, we will tell you to get a pest treatment first — then we repair the damage they left behind.
Our Process
Step 1 — Free inspection. We map every damaged member with photos, check how far the rot goes with a probe, and find the moisture source that caused it.
Step 2 — Written estimate. Each repair itemized: sistering, replacement, supports, subfloor. Plus the moisture fix — because new wood in a wet space is money wasted.
Step 3 — Stabilize. We set temporary supports so everything is safe and level before we touch the damaged wood.
Step 4 — Repair. Sister, replace, reset — the structural work, done to carry the load properly.
Step 5 — Fix the moisture. Drainage, vapor barrier, dehumidifier — the reason the wood rotted gets eliminated.
Step 6 — Verify. We check levels, confirm the structure is sound, and show you the finished work with photos.
When You Need an Engineer
We will be straight with you: some situations need a structural engineer, not just a contractor. Major foundation movement, severely compromised main beams, or anything where the load path is unclear — we will tell you to get an engineer's stamp before we quote the repair. It protects you and it protects us. Most crawl space wood rot does not need an engineer. When it does, we will say so.
Repair First, Then Protect
The order is non-negotiable: fix the structure, then fix the moisture, then seal and finish. We have seen too many encapsulated crawl spaces with rotted joists hidden under a pretty liner — the previous company sealed the problem instead of fixing it. We do not work that way. The wood gets repaired in the open, where we can see it, and the moisture fix goes in so the repair lasts. That is what "done right the first time" means.
Signs You May Need Structural Work
Floors that sag, slope, or feel bouncy. Doors and windows that stick. Cracks in interior walls, especially above doors. A visible dip in the floor when you set a ball down and it rolls. Gaps between the floor and the baseboard. Any of these deserves a free inspection — catching rot early is the difference between sistering a joist and replacing a floor.
Every project is different — contact us for a free written estimate.
Call (301) 679-9193 or send the form below for your free crawl space inspection.