An interior perimeter drain feeding a sump is worth it when water is arriving through or under the wall and the outside cannot be dug. Interior sealants and coatings are not worth it for that problem, because they are applied to the inside face of a wall the water is already moving through. The two get sold under the same phrase.

The condition here that decides it

Up to 100% of the mapped ground in Syracuse is rated as susceptible to ponding, and the shallowest mapped seasonal water table sits 3.1 inches down. That is the profile where interior work is the correct answer rather than the convenient one. Water arriving at the joint between the wall and the floor under pressure from beneath cannot be intercepted from outside — there is nothing outside the wall to intercept. An interior drain and a sump is what the ground here is asking for.

The reasoning behind that

The phrase covers two different products. One is a drain: the slab edge is cut, perforated pipe is laid at the footing, and the water is collected and pumped out. That is real work with a real mechanism.

The other is a coating applied to the inside of the wall. Where water is under pressure from outside, a coating either holds and moves the problem or fails and blisters. It is useful against damp and vapor and not against liquid water arriving under head.

The case for the drain is strongest where the exterior is unavailable — a patio, a driveway, a shared wall, a neighboring building — or where the water is coming up at the wall-floor joint rather than through the wall face.

The case against it is that it accepts water into the structure by design. Where the outside can be dug and the budget allows, stopping the water outside is the better outcome.

More on this: Basement Waterproofing and Interior French Drain in Syracuse, UT.

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