Exterior waterproofing excavates down to the footing and applies a rubberized or sheet membrane directly to the foundation wall, then protects it with a drainage board before backfilling. It stops water at the source instead of managing it once it’s already inside, which is why it’s the standard for a foundation with a history of leaking or where the wall itself is being repaired.
Weeping tile is the perforated pipe that runs along the base of the footing and carries groundwater away from the foundation to a sump pit or storm connection. Older clay or unperforated tile clogs or collapses over decades; when that happens, water backs up against the wall instead of draining away. Replacing it is usually done alongside exterior waterproofing since both require the same excavation.
An exterior job starts with excavating along the affected wall down to the footing, which means temporarily removing any adjacent landscaping, decking, or steps in that area. Once excavated, we repair any cracks, apply the membrane, install or replace the weeping tile, add a drainage board, and backfill in stages to avoid damaging the new membrane. Interior systems skip the excavation entirely, routing water through a channel along the interior footing to a sump pit instead, which is why interior work is faster and less disruptive but doesn’t stop water at the source the way exterior waterproofing does.
A drainage channel installed along the interior footing, routing water to a sump pit without excavating outside.
Collects the water the drainage system channels and pumps it away from the foundation.
A wall membrane that manages residual moisture in a finished basement.
Exterior waterproofing typically runs $150 to $250 per linear foot, covering excavation, membrane, weeping tile, and backfill along the treated section. Interior drainage systems usually cost less since no excavation is required, though they manage water rather than stopping it at the source the way exterior work does. Site access, depth to the footing, and whether landscaping or a deck needs to be removed and restored all affect the final price, which is why every waterproofing quote follows an on-site assessment rather than a phone estimate.
Interior waterproofing manages water that has already reached the wall, typically through a drainage channel along the base of the wall that carries water to a sump pit rather than letting it pool on the floor. Exterior waterproofing stops water before it reaches the wall at all, using a membrane and new or repaired weeping tile installed after excavation. Interior systems cost less and can be installed without digging, but exterior work addresses the source rather than managing the symptom, which matters more for a wall that’s also showing cracking or bowing.
Once a system is installed, keep gutters clean and downspouts extended well away from the foundation, since surface water is still the easiest way for a wall to get wet even with a proper drainage system underground. If you have an interior system tied to a sump pump, test the pump each spring before the thaw and consider a battery backup if you’ve ever lost power during a storm. A properly installed exterior membrane and weeping tile system generally doesn’t need maintenance, since it’s working passively behind the wall. A wall that was dry for years and suddenly starts showing dampness is worth a fresh look, since the cause is sometimes a new landscaping change or a downspout that came loose rather than a failure of the original system.
Often the first sign of moisture getting through the wall or floor.
A chalky residue left behind as water evaporates through concrete.
Seasonal patterns usually point to a drainage or grading issue outside.
Tell us what you're seeing and where it is on the property.
We inspect the affected area, confirm the cause, and check whether it's still active.
A specific scope of work and price in writing before we schedule anything.
Work is carried out to the agreed scope, then we review it with you and confirm it matches the quote.
Exterior waterproofing stops water before it reaches the wall and is the more thorough fix; interior drainage manages water that gets through and is faster and less disruptive to install.
Exterior waterproofing typically runs $150-$250 per linear foot; interior drainage systems are usually less since no excavation is required. Your written quote will reflect your specific foundation.
Not necessarily the full perimeter – we assess where the water is actually entering before recommending how much of the wall needs treatment.
If the smell is caused by moisture coming through the foundation, yes. A smell with no moisture source may point to ventilation or a different issue entirely.
Exterior work requires temporarily removing landscaping, decking, or steps directly along the excavated section, which we restore as part of the job.
A typical single-wall section takes several days including excavation, repair, membrane installation, and backfill; full-perimeter jobs take longer and are usually done in stages.