Chimney Repair
Chimney Masonry Repair in Islip, NY
Repointing, crown repair, flashing and full rebuilds across Islip. This is the masonry side of a chimney: the brick, the mortar and the waterproofing.
What we don’t do: flue sweeping, lining, relining, or appliance work. That’s a different trade with a different certification. If your problem is inside the flue we’ll tell you and point you elsewhere rather than take the job.
The ground under Islip
Islip is south-shore outwash: sand and gravel washed out from the moraines to the north and laid down flat. Level ground, free-draining subgrade, easy excavation: on paper the most straightforward material we work on. Streets closer to the water sit on a higher water table, which limits how deep you can excavate before working wet.
Ground type matters less for chimney work than for anything else on this list, because the problem is above the roof rather than below the ground. What does apply everywhere on Long Island is the freeze-thaw cycle: water gets into masonry, freezes, and pushes the face off. Catching a failed crown early is the cheapest intervention available.
How we do the work
Every common chimney fault traces back to water getting into masonry and freezing.
Failed crown. The concrete cap on top. Thin, flat crowns crack early, and water then runs straight down inside the brickwork. The most common cause of chimney deterioration, and the cheapest thing to fix if it’s caught.
Open mortar joints. Mortar is sacrificial. It’s meant to wear before the brick does. Once joints are recessed, soft or missing, water gets behind the face.
Spalling brick. Faces popping off. Water that got in, froze, and pushed the face away. Spalled brick can’t be repaired; it gets cut out and replaced.
Failed flashing. Where the chimney meets the roof. Shows up as a ceiling stain, so it often gets diagnosed as a roof leak.
What we do: cut out joints to depth and repoint with mortar matched to the existing masonry; rebuild crowns with a proper overhang and drip edge; replace spalled units; re-flash at the roof line; and where appropriate apply a breathable masonry sealer: a film-forming sealer traps moisture inside the brick and accelerates the damage it’s meant to prevent.
What moves the price in Islip
Drainage design is what varies here. On flat ground water doesn’t run off on its own. It goes where the pitch sends it, and getting consistent fall across a large area is a set-out job done before anything is laid. On a slope you can be sloppy about that and get away with it; on Islip’s flat lots you cannot. Parts of the south shore also sit in mapped flood zones, where added hard surface becomes a regulatory question rather than a design preference.
Local rules
Islip is in the Town of Islip: the hamlet and the town share a name, which occasionally confuses paperwork but does make the answer simple. Unincorporated, so the town office.
What we’ll do regardless: tell you what applies before you sign, not after we’ve started.
Why this crew
The person who quotes the job is on the crew that runs it, and the quote states the base depth, which is the line worth comparing across any estimates you’re holding.
ICPI certified, Techo-Bloc Pro, A+ with the BBB, trading since 2017, working out of a yard on Horseblock Road in Medford.
Frequently asked questions
How do I know if it’s the chimney or the roof?
Often you can’t tell from inside, because failed flashing and a failed crown produce the same ceiling stain. That’s why we look at it rather than diagnose it over the phone.
Will the new mortar match?
New mortar is always brighter than sixty-year-old mortar and weathers in over a season or two. We can tint to get closer, and on a partial repoint that’s usually worth doing.
Will more hard surface make my drainage worse?
It can. Every square foot of hard surface is a square foot that no longer absorbs water, and on flat south-shore lots that water has to be given somewhere to go. It’s a design question, not a reason not to build.