Chimney Waterproofing in Seattle
Chimney waterproofing applies a breathable, water-repellent sealant to the masonry so rain runs off instead of soaking into the brick. It slows damage from moisture and freeze-thaw cycles, and works best after any needed repairs are done.
- WA L&I SEATTCP743MH
Signs to look for
- Brick that stays dark and wet
Masonry that holds water for days after rain.
- Efflorescence or staining
White powder or stains on the brick.
- Moss or algae growth
Green growth shows constant moisture.
How we do it
- 1
Check the masonry
We repair cracks, joints and the crown first, since a sealer does not fix damage.
- 2
Clean the surface
We clean the brick so the sealer can soak in.
- 3
Apply the sealer
We apply a breathable, vapor-permeable water repellent.
- 4
Check the result
We check coverage and the condition of the crown and flashing.
Before and after
Why it matters in Seattle
In Seattle, masonry stays damp for much of the year. A water-repellent treatment after repairs helps keep brick dry between storms.
Related services
Where we work
We serve Seattle and nearby neighborhoods. See the areas we serve.
Frequently asked questions
Why does the sealer need to be breathable?
A sealer that traps moisture inside the brick can cause damage. A breathable sealer lets water vapor out.
Is waterproofing a substitute for repair?
No. Cracks, failed mortar and a broken crown should be repaired first.
How long does sealing last?
It depends on the product and the exposure. Ask us about your chimney.