About 8 out of every 10 Akron basements we quote need interior waterproofing. Not because it is cheaper for us, but because in most of these houses the wall is sound and the drainage around it is not.
That said, there are 4 situations where interior work is the wrong answer and digging is the only real fix. This page covers both sides so you can tell which one you are looking at.
Side by side
| Interior | Exterior | |
|---|---|---|
| What it does | Relieves the pressure under your floor | Re-seals the wall from the water side |
| Time on site | 2 to 4 days | 5 to 10 days |
| Season | Any, frozen ground included | Not winter |
| Your yard | Untouched | Plants and walkways come up |
| Akron price | $68 to $92 per linear foot | Roughly 3x that |
| Warranty | Lifetime, transferable | Lifetime, transferable |
How interior waterproofing actually works
A channel is cut around the inside edge of the slab. Slotted pipe goes in clean stone, runs the perimeter, and feeds a sump pump . A wall barrier sends any seepage down into that channel instead of onto your floor.
The point is not to stop water. It is to give water a route that is easier than pushing through concrete. That is why paint fails and drainage does not.
How exterior waterproofing actually works
The ground is dug to the footing along the affected side, usually 7 to 9 feet (2.1 to 2.7 m) down. The wall gets cleaned and patched, then a membrane and a dimpled drain board go on the outside face. A new footing drain is laid, and the trench is backfilled with stone rather than the clay that came out.
It is the same specification a new build should get, which is why doing it during construction costs so much less.
What an excavation week actually looks like
Homeowners underestimate exterior work because the price is quoted per foot, like interior work, and the disruption is nothing like it.
| Stage | What happens | Duration |
|---|---|---|
| Utility locates | Ohio 811 marks gas, water, power and cable | 2 working days before |
| Strip and store | Plants lifted, pavers stacked, topsoil piled separately | Half a day |
| Excavation | Machine dig to footing, spoil stockpiled or carted | 1 to 2 days |
| Wall prep | Old coating removed, voids patched, corners filleted | 1 day |
| Membrane and board | Membrane applied, drain board fixed, terminations sealed | 1 day |
| Footing drain | Slotted pipe in washed stone, wrapped in filter fabric | Half a day |
| Backfill | Free-draining stone in lifts, compacted, graded high | 1 day |
| Reinstate | Topsoil, seed or sod, pavers relaid | 1 day |
The machine needs a route in. A 3-foot gate, a deck over the wet elevation, or a neighbor’s fence 2 feet off the wall can turn a machine dig into a hand dig, and a hand dig doubles the labor line.
The hidden costs nobody quotes on the first visit
- Landscaping you actually care about. Mature shrubs against the wall rarely survive. Budget $400 to $1,800 to replace planting on one elevation.
- Hardscape. A patio, walkway or driveway edge over the trench line has to come up and go back. Concrete replacement runs $9 to $16 per square foot in Akron.
- Utility conflicts. Gas and water services enter through the wall you are exposing. Relocating a shallow service line is a utility job with its own timeline.
- Buried oil tanks. Common in pre-1950 Akron houses. Finding one stops the dig, and removal is a licensed trade with disposal paperwork.
- Spoil disposal. Nine feet of clay off one elevation is 20 to 30 tons. Some lots can store it, most cannot, and hauling is $350 to $700 per load.
The 4 times exterior is the right call
- The wall itself is failing. Old stone or early block losing mortar from the outside face. You cannot fix the outside of a wall from the inside.
- The original clay tile drain has collapsed. Nothing is relieving the footing, and an interior system alone leaves the wall sitting in water.
- The wall has moved. A bow or a sideways crack is structural and often gets held and re-waterproofed together.
- You are already digging. New driveway, addition or landscaping. The trench is the expensive part, so use it.
When we recommend both
Roughly 1 job in 12 gets interior and exterior work on the same house, and the reasoning is always the same: the membrane stops water crossing the wall face, and the interior drain relieves what is under the slab, which a membrane can never reach.
The 2 clearest cases are a stone wall that leaks through its face while the floor also weeps at the cove joint, and a house where the footing sits below the surrounding water table. In both, doing only one half buys a partial result at nearly full price. We phase them across 2 seasons when the budget needs it, exterior first, because the interior work is the part that can be done in January.
The question that decides it
Where does the water arrive?
- At the floor line, or up through the slab. Pressure from below. Interior drainage.
- Through the face of the wall, mid height, over a wide area. The wall is porous or the outside seal has failed. Exterior.
- At one point, always the same spot. Neither. That is a crack, and it gets injected .
What each one looks like to a buyer later
Both carry the same lifetime transferable warranty from us, and both get disclosed when you sell. The practical difference at closing is what an inspector can see.
Interior work is visible: a channel edge at the slab, a sealed pump lid, a discharge line outside. Buyers ask about it, and the warranty certificate answers the question in one page. Exterior work is invisible once the ground is back, so keep the photographs. Trench photos, the membrane product data sheet and the drain layout are what turn an invisible improvement into a documented one. Our project write-ups are built the same way, for the same reason.
Interior against exterior, the questions we get
Is exterior waterproofing better than interior?
No, it is different. Exterior is better at protecting a wall that is deteriorating from the water side. Interior is better at relieving pressure under a slab, which is what most Akron basements actually suffer from, and it is the only option that works on frozen ground in February.
Can exterior work be done on just one wall?
Yes, and it usually is. Water rarely arrives on all 4 elevations through the wall face. We dig the elevation the hose test and the readings point at, which is also why the per-foot figure matters more than the total perimeter length.
Will digging outside disturb the footing?
Not when the trench is stepped and the wall is braced where deflection already exists. A bowed wall gets held before the soil comes off it, because removing lateral support from a wall that is already moving is how a bow becomes a collapse.
Does interior drainage make the basement usable for a finished room?
Yes, and that is one of its advantages. The channel finishes flush at the slab edge, and studs go up in front of the wall membrane. Wait 30 days before laying flooring over new concrete, and never screw through the membrane, which is one of the few things that voids the warranty.
A contractor who only sells one of these will always find a reason you need that one. We quote both and put the reasoning in writing next to the price. The full method list covers the other 4 options if neither of these fits what you are seeing, and our inspection ends with a number for each.
