Chimney Waterproofing

What This Service Involves

Brick and mortar are porous, and in a climate as wet as the Puget Sound region they soak up rainwater like a sponge, driving efflorescence, spalling, and interior dampness. A vapor-permeable masonry repellent seals out liquid water while still allowing the chimney to breathe, so moisture already in the wall can dry outward instead of freezing and cracking the brick. We prep the surface, address any open mortar joints, and apply the repellent evenly for full coverage on every exposed face. This preventive treatment dramatically slows the freeze-thaw damage that shortens the life of Northwest chimneys.

Benefits

Blocks rain absorption that drives spalling and efflorescence; stays vapor-permeable so the masonry can dry from within; slows freeze-thaw damage that cracks brick over winters; extends the life of the chimney and reduces future repair costs

Our Process

1) Clean the masonry and let it dry thoroughly; 2) Point up any open or failing mortar joints; 3) Apply a breathable water repellent evenly across all faces; 4) Confirm complete coverage and proper beading of water

What Affects the Cost

Height and total surface area of the chimney; amount of mortar repair needed before sealing; type and grade of repellent product used; number of coats for full saturation; access and staging at roof height

Best Time of Year

Waterproof the chimney during a dry summer stretch when the masonry is fully dry, giving the repellent time to cure before the rains return.