When it comes to sealing a brick chimney there are a few things to consider. First, check the cap on the chimney. Often times the cap will start to deteriorate and can cause water to get in and travel down into the house. In severe cases, chimney caps have to be repaired or replaced, or the chimney may need to be repointed. If you don't have any severe issues and simply need to seal the brick, you want a water repellent sealer.

Water repellent sealers are designed to stop the absorption of water and other liquids on the surface. Harsh and heavy winds, rain storms, snow and ice, and other weather factors contribute to water getting into the brick. Once water has entered the pores of the brick it can cause deterioration, cracking and pitting, ice and salt damage, staining, and mold and mildew. When brick is sealed with a water repellent sealer, these issues are significantly reduces and in many cases, prevented.

When it comes to water repellent sealers there are a few different chemicals that can be used. The first is a Siliconate water repellent like the Armor SC25. The Armor SC25 is a one-coat application that overs an immediate, aggressive bead. The second is a Silane-Siloxane blend water repellent like the Armor SX5000 or Armor SX5000 WB. Silane-Siloxane blend sealers are better than Silane or Siloxane alone because the blended products offers equal protection above and below the surface. The Armor SX5000 and Armor SX5000 WB are approved by the Department of Transportation as water repellent sealers, and require 2 coats.

Water repellent sealers are breathable sealers that won't change the look or color of the brick chimney. They won't leave behind a film or coating, and they won't change the look of the chimney. They are designed to provide up to 10 years of protection and will keep your chimney protected from the damaging effects of water absorption.


Armor SX5000 Penetrating Silane Siloxane Concrete Sealer and Masonry Water Repellent (5 GAL)

Armor AR350 Solvent Based Acrylic Wet Look Concrete Sealer and Paver Sealer (5 GAL)

Armor AR500 Solvent Based Wet Look High Gloss Acrylic Concrete Sealer and Paver Sealer (5 GAL)

Armor UTN60 Oil and Gas Resistant Aliphatic Urethane Concrete Floor Coating

5 GAL Armor S2000 Concentrated Sodium Silicate Concrete Densifier Sealer and Surface Hardener

Armor SC25 Siliconate Water Repellent Concrete Sealer with Salt Guard (1 GAL)