Injection repairs for leaking cracks in Madison's poured walls, and a careful look at cracks in older block and stone foundations.
Crack injection is meant for poured concrete walls, which in Madison you will mostly find in houses built from the later postwar years onward and in the newer homes that have replaced older ones on many lots. A contractor sets ports along the crack and pumps polyurethane or epoxy through the full thickness of the wall. Polyurethane stays flexible and is common for active leaks, while epoxy cures hard when some structural bonding is wanted. The work is done from inside and usually takes a few hours, with little dust or disruption to a finished room.
A lot of Madison basements are not poured concrete at all. Block walls from the 1950s and 1960s are hollow, so injection does not stop water that travels through the cores, and leaks there are usually handled with drainage. Stone and brick foundations in older homes near downtown crack along mortar joints and need repointing rather than injection. Freeze and thaw cycles through a northern New Jersey winter can widen small openings over time, so a crack that was dry for years may start leaking after a hard winter or a wet spring.
Some cracks point to movement rather than a simple leak. Horizontal cracks in block, stair-step cracks along mortar lines, and walls that bow inward suggest soil pressure, and a structural engineer should look before anyone seals over them. On the moraine, buried boulders and mixed soils can settle unevenly under an older footing, and a new foundation next door can disturb the soil along the property line. Mark the ends of a crack with a pencil and the date, and check it monthly so your contractor can see whether it is growing.
Usually not. Block walls are hollow, so water moves through the cores and around an injected crack. Drainage or exterior work is the typical fix for block walls.
Stone foundations are generally repointed with mortar suited to old masonry, sometimes paired with drainage to manage water. Ask for a contractor with experience on historic foundations.
Document it with photos and dates and have it looked at. Heavy excavation nearby can disturb soil, and a structural engineer can tell you whether the wall is moving.
Spring Garden Brook and Black Brook, both Passaic River tributaries, have flooded historically, usually from heavy local thunderstorms and summer and fall hurricanes.
morriscountynj.govThe county mitigation plan lists the Kings Road area, the Anthony Drive and North Street area, the Belleau Woods culvert and Spring Garden Brook as flood prone spots.
morriscountynj.govThe plan notes inlets on Madison's steep streets work poorly, so runoff overshoots them and collects in flatter areas, and the North Street sewer pump station was overwhelmed by stormwater backup.
morriscountynj.govA perimeter drain and sump pump for Madison basements that take on water at the floor joint, especially in lower areas near the brooks.
Digging down to the footing to seal the outside of a Madison foundation, best suited to lots with room to work and walls worth protecting from the outside.
Sealing the damp crawl spaces under Madison additions, porches, and older homes to stop musty air and protect the framing.
Pumping out, drying, and clearing damaged materials after a storm, failed pump, or backup floods a Madison basement.