Waterproofing chimney masonry after repairs in Key Biscayne
A workmanship warranty covers the treatment we apply in Key Biscayne, and the price is set out upfront with no hidden fees.
- Owned and run locally
- Available for same-day service
- Fully licensed and insured
- Family owned and run
Masonry clues that point to waterproofing in Key Biscayne
- Glossy patches from an earlier coating
- Rust stains running down the brick
- Uneven color across repaired sections
- Worn, rounded brick edges from past blasting
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Repairs, preparation and a named repellent
What a repellent can and cannot bridge
Penetrating repellents work in the pores of brick and mortar, not across gaps. Some product data allows for very fine shrinkage cracks, but anything wider is beyond what the treatment can close. Brick industry guidance also notes limited effect against wind-driven rain through cracks.
We look closely at the cracks on your chimney before recommending treatment. Hairline crazing may be within what the product tolerates. Open cracks, separated joints and gaps at the crown are not. Those are listed for repair, and the estimate explains which cracks were judged which way.
Moss and algae come off before the repellent
Moss, algae and small plants on a chimney hold water against the brick and block a repellent from soaking in. They have to come off before treatment. Roots in mortar joints can also open the joints further.
We remove growth with a method suited to the masonry, avoiding harsh treatments that could damage the surface. Where roots have opened joints, those joints are listed for repointing. The treatment then goes onto clean, sound masonry, rather than over growth that will lift it.
Staining on treated masonry
Brick industry guidance notes that if staining appears on masonry after a clear treatment, it can be harder to remove than it would have been from untreated brick. The treatment holds some stains near the surface.
That is one reason cleaning comes first. The source of any staining, such as rusting metal or runoff from the roof, should also be dealt with before treatment. We point out stain sources during the inspection. Removing them first keeps them from being locked in.
Uneven color after earlier work
A chimney with patches of new brick, different mortar or an old coating can look uneven. A clear repellent will not hide those differences, and it may make some of them slightly more visible by darkening one material more than another.
If the look of the chimney matters, we talk about it before the test area. The test is placed to include the different materials, so you can see how each responds. If the result is not acceptable, we discuss other options before the whole chimney is treated.
Checked before any repellent is priced
- Brick faces checked for flaking or cracks
- Cap or open flue noted at the top
- Faces and height to be treated
- Nearby vents and intakes covered
Common questions on treating chimney brick
What happens if it rains on the application day?
Product data sets a rain-free period after application, along with temperature and wind limits. We plan for a dry window and move the date if the forecast turns. If rain arrives unexpectedly, we tell you what was affected and whether any area needs another pass.
Is it worth protecting the brick on a chimney we do not use?
It weathers the same as one in use. Rain soaks its brick, and water that gets in can damage the masonry and the house around it. Repairs come first either way, and a breathable repellent can follow where the brick absorbs too much.
Will the treated brick still let moisture out?
With a breathable repellent, yes. It keeps most liquid water from soaking in while letting water vapor leave through the face. That matters on a chimney, because moisture reaches the masonry from inside as well, and a sealing film could hold it in.
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Chimney & Fireplace Brands We Work With
DuraVent 
Olympia Chimney and Venting 
Copperfield Chimney Supply 
Rutland 
Heatilator 
Heat & Glo