, ,

A-T Brick Chimney Sealer

From: $65.00 USD

  • Brick becomes water repellent-Tested to ASTM E-514.  Stops wind driven rains from penetrating.
  • Natural look of the brick is maintained. No gloss, sheen or film is left
  • Penetrates into the brick for long life
  • 100% water vapor permeable
  • Horizontal or vertical use
  • VOC content < 200gm/L
  • Eco-Friendly water-based formula
  • Easy application by pump up sprayer, brush or roller.  Clean up with soap and water.

Select a tab for more product information:

Water beading on bricks treated with A-Tech Brick Chimney Sealer
Natural Look Brick Sealer

A-T Brick Chimney Sealer is a penetrating silane/siloxane blend water repellent that prevents water penetration.  It conforms to ASTM-514 for 8% siloxane blend for simulated wind driven rains of up to 62 mph.

A-T Brick Chimney Sealer is a water-based formula of siloxane and alkylaoxysilane.  It penetrates into the brick top form a water repellent barrier against wind driven rains.  After penetrating, it forms an invisible barrier.  The microscopic pores are filled below the surface.  This forms a hydrophobic barrier that last for years.

A-T Brick Chimney Sealer is 100% breathable and allows water vapor from the interior of the building to escape.  This helps to reduce spalling caused by water trapped in the brick and then freezing.  The freezing causes the water to expand and damage the brick.

Protect your brick chimney from the damages of water with our natural look penetrating brick chimney sealer. The penetrating siloxane water repellent stops water from getting into bricks or mortar.

Ready to use. Just stir and apply with a brush, roller or pump-up hand sprayer. Will not darken or change the look of the brick.

  • 5 Year warranty
  • Prevents water penetration
  • Efflorescence and water-borne stain protection
  • Reduces-spalling and freeze-thaw cycle damage
  • Water-based formula for easy clean up
  • Environmentally friendly low VOC formula
  • 100% Vapor permeable allows interior water vapor to evaporate out


  • Water-based means no harmful solvents
  • Brick maintains the natural look-no gloss or sheen
  • VOC compliant
  • Long lasting bond to the substrate
  • Easy soap and water clean up
  • 100% Breathable

Application & Coverage

100-150 sq. ft./gallon

Apply with pump up sprayer, brush or roller.

Where to Use

Exterior brick or masonry chimneys, including the cement caps.  Works on flagstone, concrete, and slate.