💧 Leak Repair

Chimney Waterproofing & Leak Repair in Monsey & 30 miles around

Find the actual leak, fix the actual leak. No guessing, no caulk-and-pray.

💵 $400 – $1,200 ⏱️ 4–8 hours 📸 Photos with every job 🛡️ Licensed & insured

What this service actually is

Water is the number one destroyer of chimneys — worse than fire. Brick is a sponge, and a chimney is the only part of the house sticking straight up into the weather with no roof over it. We track leaks to their real source, which is usually flashing, crown or absorbent masonry rather than the mystery everyone assumes.

What you get

Systematic leak diagnosis — flashing, crown, cap, mortar and brick face
Step and counter-flashing repaired or replaced properly, not smeared with tar
Vapor-permeable siloxane sealers that let the masonry breathe while shedding water
10-year waterproofing warranty on qualifying applications
Stops the freeze-thaw cycle that turns a small crack into a rebuild

How we do it

1. Trace the water

Roof-level inspection plus interior check. Nine times out of ten it is flashing or crown, not "the chimney is leaking" in the abstract.

2. Repair the entry point

New step flashing and counter-flashing cut into the mortar joint, crown repair, repointing where joints have washed out.

3. Waterproof the masonry

A breathable siloxane sealer applied to saturation. Never a film-forming sealer — those trap moisture and accelerate spalling.

Signs you need leak repair

If any of these sound familiar, it is worth a call. There is no charge to ask.

Brown ceiling stains near the chimney after heavy rain
Damp, musty smell from the fireplace on wet days
White chalky residue (efflorescence) on interior or exterior masonry
Rusted damper, or standing water in the firebox
Peeling wallpaper or bubbled paint on the chimney chase wall

What it costs

Chimney Waterproofing & Leak Repair typically runs $400 – $1,200 for a standard single-family home in our service area, and takes about 4–8 hours. The variables that move that number are roof access, flue height, how many flues share the stack, and condition. You get a flat written quote before any work starts — see the full pricing page for every service we offer.

Where we do it

We provide leak repair throughout our 30-mile service radius from Monsey: all of Rockland County, southern Orange County, western Westchester, and Bergen and Passaic Counties in New Jersey. That includes Monsey, Spring Valley, Suffern, New City, Nanuet, Pearl River, Nyack, West Nyack and 89 more towns.

See all 97 towns we serve →

★★★★★

“Booked the sweep and asked about the dryer while they were here — they did it same visit and gave us a break on the price. Dryer went from two cycles to one.”

Rivky L.Wesley Hills, NY

Why homeowners pick Hero

We are a family company working out of Monsey, not a national franchise routing your call to a dispatcher three states away. That means the person who quotes your job is on the roof doing it, the price does not change halfway through, and if something is not right afterward we are twenty minutes away.

Every visit includes photo documentation. Every recommendation comes with an explanation of what happens if you wait, so you can make the call on your own timeline instead of ours.

❓ FAQ

Leak Repair — common questions

Where do chimney leaks usually come from?

In our experience across Rockland and Bergen: flashing first, crown second, missing or failed cap third, then porous brick and open mortar joints. The flue itself is rarely the culprit.

Can I just use a hardware-store sealer?

Please do not use anything film-forming or silicone-based. It traps moisture inside the brick, and the next hard freeze pops the faces off. Masonry needs a vapor-permeable siloxane.

Do you do the flashing, or does the roofer?

We do it. Chimney flashing is a chimney problem, and passing it back and forth between trades is how homeowners end up leaking for three years.

How long does waterproofing last?

A quality siloxane application generally holds 7 to 10 years in this climate, and we warranty qualifying jobs for 10.

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Need leak repair?

Free quotes, flat pricing and same-week appointments across all 97 towns we serve.

📞 (845) 555-0142 Book online — free quote