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Get a Free QuoteRoof leaking or storm damage? We answer day or night, 7 days a week: call 631-965-0881. Home Crew Construction is a family-owned, third-generation roofing and exterior contractor serving Nassau & Suffolk County. Every quote is free with no obligation, and we reply within 24 hours. New roofs come with a 10-year labor warranty plus a lifetime manufacturer warranty.
Chimneys · Long Island
Chimney waterproofing for homes in Nassau and Suffolk County. A breathable water repellent keeps rain out of the brick while letting moisture escape.
Brick and mortar are porous. They soak up rain like a sponge, and on Long Island that water freezes and thaws all winter. Chimney waterproofing slows that cycle down. We apply a breathable water repellent to the outside of the chimney so rain beads off instead of soaking in. Home Crew Construction waterproofs chimneys across Nassau County and Suffolk County.
Yes, when it is done right. Chimney waterproofing is a breathable water repellent applied to sound brick and mortar. It stops rain soaking into the masonry but lets trapped moisture escape. Home Crew Construction repairs cracks and joints first, then waterproofs chimneys across Long Island to slow freeze-thaw damage.
How it works
Water is the main enemy of a masonry chimney. Each part keeps it out of a different spot.
A chimney always has some moisture inside it, from the air and from the flue gases. If the brick is sealed with paint or a non-breathable sealer, that moisture gets trapped. When it freezes, it can blow the face off the brick. We use breathable, vapor-permeable water repellents that keep liquid water out but let water vapor escape.
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Not always, and we will tell you if yours doesn’t. It makes the most sense for chimneys that take a lot of weather: tall chimneys, chimneys on the windward side of the house, and homes near the water. It also pays off on older, softer brick that already shows staining or spalling, and on chimneys that have just been repointed or rebuilt, to protect the new work. A chimney in good condition with dense, hard brick may not need it yet.
Need help with chimney waterproofing?
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Late spring through early fall, in a dry spell. The brick has to be dry for the repellent to soak in, and any new mortar or concrete has to cure first. The goal is to have the chimney treated before the first hard freeze, so the brick goes into winter dry. If your chimney needs repointing or a new crown, we plan the waterproofing as the last step of the same project.
The water repellent goes on the brick and mortar faces. The crown gets its own crown sealant, and the flashing is handled as metal work. Treating each part the right way is what makes the whole chimney hold up.
Waterproofing protects sound masonry. It doesn’t hold crumbling mortar together, close cracks or replace failed flashing. It isn’t permanent either: water repellents wear off over time and need to be reapplied, which a yearly inspection will catch. If your chimney is already leaking, the cause is usually somewhere else, so we find it first. For leaks, cracks and loose brick, start with chimney repair.
Want to protect your chimney before winter? Call 631-965-0881 or request a free quote. We reply within 24 hours.
Chimney waterproofing FAQ
Still not sure?
Call 631-965-0881 any time. We'll tell you straight whether it's a repair or a replacement.
Only after the leak is fixed. Leaks usually come from the flashing, the crown or open mortar joints. We repair those first, then waterproof the brick.
A breathable water repellent soaks into the brick rather than forming a shiny film, so the chimney should look much the same.
No. New mortar and concrete need time to cure before a water repellent goes on. We schedule the treatment once the repairs are ready for it.
It depends on the product and how exposed the chimney is. We tell you what to expect for the product we use, and your yearly inspection will show when it is time to reapply.
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