Groundwater finds every crack and gap in a foundation that lacks proper waterproofing. Boston Concrete digs to the footing, applies a bonded membrane, installs drainage board and new weeping tile, then backfills with stone that channels water away from the wall. The result is a dry basement that stays dry. We handle new pours before backfill and retrofit existing foundations showing water damage. Every project includes a free written estimate.
Why Exterior Waterproofing Works When Interior Coatings Fail
Interior sealers and paints are a band-aid. They hide the wet spot but the concrete behind them stays saturated. Freeze-thaw cycles continue to work the wall apart, and the paint eventually flakes off. The real problem is on the outside, where groundwater presses against the foundation.
Proper waterproofing means excavating to the footing, cleaning the wall, bonding a membrane that stays bonded, installing drainage board, replacing the weeping tile, and backfilling with stone that lets water move down to the tile instead of pooling against the wall. This is the same system we install on every new foundation before backfill, and it is what we retrofit onto existing foundations that have started leaking.
Combine waterproofing with foundation crack repair when the wall has structural damage. The two services work together to keep the basement dry and usable. See all our foundation services to understand the full scope of what we offer.
Recent work
The sequence
How We Waterproof a Foundation in Boston
Assess the wet spots
We identify which walls are leaking, check the grade and gutter system above, and determine whether weeping tile is clogged, failed, or missing. This tells us exactly where to dig and what system to install.
Excavate to the footing
We dig down the affected wall sections to expose the foundation from footing to grade, remove old coatings and failed waterproofing, and inspect the concrete before any new work begins.
Install the membrane
A bonded waterproofing membrane goes on the cleaned wall from footing to grade, drainage board covers it, and the wall is allowed to cure before backfill stone is placed.
Restore drainage and grade
New weeping tile is bedded in clean stone at the footing, the trench is backfilled with drainage stone over the tile, the grade is restored, and gutters are extended away from the wall.
Why interior fixes fail
Painted Basements Keep Leaking Because Water Comes From Outside
We regularly see basements that have been sealed or painted once, twice, or three times. The paint cracks, efflorescence blooms again, and the wall is still damp. The water is still on the outside of the foundation, still pressing against the wall, and the interior coating is not stopping it.
Interior vs exterior, weeping tile, retrofit work and what waterproofing actually keeps out.
Because the water is on the outside of the wall. Interior sealer paints over the symptom; the foundation behind it is still saturated and still freezing and thawing, which keeps working the wall apart. Exterior waterproofing stops the water from ever reaching the wall.
On almost every job, yes. If we are excavated down to the footing for waterproofing, replacing or installing weeping tile then is the right call. Bedding it in clean stone and tying it to the drainage system finishes the system.
Yes, if the leak is localised to one wall or one corner, we can excavate and waterproof that section only. We will be honest in the assessment about whether the rest of the wall is likely to fail next.
It seals over them from the outside, but a structural crack still needs crack repair on its own. The two services often go together, and we sequence them so the crack is properly addressed before the membrane covers it.
A properly installed exterior membrane with drainage board and new weeping tile is a decades-long fix. We use the same systems on new installations that are designed for the full life of the building.
Homeowner reviews
What Boston Homeowners Say About Their Waterproofing Jobs
Two interior sealer jobs failed before we called Boston Concrete. They went to the outside, did it right, and the basement has been dry through two springs since.
B. G.
Boston
★★★★★
Excavated one wall, replaced the weeping tile, put on a proper membrane, restored the landscaping cleanly. Wall is dry, yard looks like nothing happened.
J. P.
Cambridge
★★★★★
Honest that the leak was just one corner and we did not need to do the whole foundation. Saved us a lot. Corner has stayed dry through the rain we had since.
E. L.
Somerville
★★★★★
Big excavation, big mess on day one, but they put the yard back together by the end and the basement is bone dry. Worth doing once and properly.
O. N.
Quincy
From the blog
Concrete Guides & Articles
Practical reading on planning, finishes and caring for concrete in Boston.
Tell us which walls are wet, when the leaking started, what has been tried before, and we will assess the foundation free and provide a written quote for any waterproofing work needed.
