Waterproofing chimney masonry after repairs in Bayside
Clean, dry, sound masonry first, then a vapor-permeable repellent applied by the method on its data sheet.
- Owned and run locally
- Available for same-day service
- Fully licensed and insured
- Family owned and run
Waterproofing warning signs we look for in Bayside
- Brick that stays dark long after rain
- Rain no longer beading on treated brick
- Brick grit collecting on the roof below
- Soil or mulch piled against the base
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Our waterproofing approach, one step at a time
Choosing a product with a track record
Brick industry guidance recommends products that have performed well on similar brick, in similar exposure, over a meaningful period. A new or untested product may look fine at first and behave differently later.
We use products whose makers publish full technical data, including the surfaces they suit and their limits. Our estimate names the product, and its data sheet is yours to read. If you have a product in mind, tell us, and we will explain whether it suits your chimney.
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.
People and pets during application
During application, keep children and pets away from the area around and below the chimney. Spray drift can travel in a breeze, and the product should not land on skin or fur. We mark off patios and paths under the chimney.
Close windows near the chimney while we work, and keep doors on that side shut. If anyone in the household is sensitive to odors, tell us in advance. Many water-based products have little smell, and we can tell you what to expect from the one we plan to use.
Avoiding hot brick during application
Product data warns that very hot surfaces reduce penetration, because the carrier evaporates before the repellent soaks in. Brick in direct sun can get hot enough for this to matter, even when the air feels mild.
We plan application for a time of day when the faces are within the product's limits. That may mean starting early or treating faces as they come out of the sun. If the surfaces are too hot, we wait rather than apply a product that will not penetrate properly.
Preparation items listed before sealing
- Crown and the joint around the flue
- Written record of product and faces treated
- Base of an outside chimney checked
- Changes after the test priced separately
Asked often about sealing chimney masonry
How do I know if my chimney needs waterproofing at all?
Watch the brick after rain. Faces that darken and stay dark long after the rest has dried are absorbing more water than they should. The free inspection checks that, along with the joints, top and flashing, and we tell you if treatment is not worth it.
How long should new mortar cure before the treatment?
The product data decides, together with the mortar used and the weather. New work often needs cleaning before treatment as well. We schedule the repellent as its own step after the repairs, so it is not rushed onto fresh joints.
Can I apply a chimney sealer from a hardware store myself?
You can, but read the product data first. Some store products form films that trap moisture, and every product needs repairs done beforehand and glass and plants protected. Working at height on a roof is the other risk. The free inspection tells you what the chimney needs either way.
More Ways to Care for Your Fireplace
- Gas Fireplace Repair and ServiceGet a model-specific gas fireplace service plan for the fault you are seeing or the maintenance your unit needs.
- Chimney Cap Installation and ReplacementProtect the chimney opening with a cap chosen for its fit, attachment and compatible system.
- Gas Fireplace VentingAssess and repair the gas fireplace vent arrangement using components suited to the identified system.
- Chimney TuckpointingRenew deteriorated mortar joints around chimney bricks that can appropriately remain.
- Wood-Burning Fireplace Insert InstallationFit a wood-burning insert after assessing its host fireplace and full connection requirements.
We received your request
Our team will contact you to arrange your inspection.
Chimney & Fireplace Brands We Work With
DuraVent 
Olympia Chimney and Venting 
Copperfield Chimney Supply 
Rutland 
Heatilator 
Heat & Glo