Chimney Sealant & Waterproofing
A breathable sealer keeps water out of the brick without trapping moisture inside it.
- Vapour-permeable sealer
- Applied after repairs
- Licensed & insured
- Family owned since 1999
FRS Roofing + Gutters
Medford, MA · Serving Greater Boston
Chimney Waterproofing in Greater Massachusetts
Brick and mortar absorb water like a sponge. A masonry water repellent stops that absorption while still letting vapour escape from inside — which is the difference between protecting a chimney and sealing moisture into it. We apply it after any needed repointing has cured, never before.
Water repellent
Rain beads off instead of soaking into the brick.
Stays breathable
Vapour escapes, so the masonry can dry out.
Freeze-thaw protection
Less absorbed water means less winter damage.
Invisible finish
No gloss, no colour change to the brick.
Repairs first
We point and patch before sealing, never over failures.
Reapplied on cycle
Typically good for 7 to 10 years.
Why it matters in Massachusetts
Freeze-thaw damage needs one ingredient: water inside the masonry. Cut the absorption and you cut the damage. But the wrong product — a film-forming sealer or paint — traps moisture behind it and accelerates spalling. The choice of product matters more than the application.
Our simple process
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1
Free inspection
We check whether the chimney is ready to be sealed.
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2
Repairs first
Open joints repointed and cracks addressed, then cured.
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3
Application
Breathable repellent applied to saturation, top to bottom.
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4
Check & photos
We confirm coverage and send you the pictures.
Backed by a real guarantee
Licensed & insured
Roof and masonry work fully covered.
Low cost, long payback
The cheapest way to slow freeze-thaw damage.
Rated by homeowners
Trusted across Greater Boston since 1999.
Rated by homeowners across Greater Boston
Chimney Sealant & Waterproofing — questions
Is waterproofing the same as painting or sealing the brick?
No, and the difference matters. Paint and film-forming sealers trap moisture inside the masonry and make spalling worse. We use a vapour-permeable repellent that lets the brick dry.
How long does it last?
Typically 7 to 10 years depending on exposure, then it should be reapplied.
Can you waterproof a chimney that needs repointing?
Not effectively. Sealer over failed joints just locks the problem in. We repoint first, let it cure, then seal.
Will it change how the brick looks?
No. A proper masonry repellent dries clear with no gloss or colour shift.
Does it fix an existing leak?
Sometimes, if the water is coming through absorbent masonry. If it is coming through the flashing, the crown or an open joint, waterproofing will not stop it — and the inspection tells us which it is.
Get a free chimney sealant & waterproofing quote
Tell us about your home and a specialist will call you back — usually the same business day. No obligation.