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Best Sealer for Brick Walls 4.4/5 (14)

Brick Wall Sealer

Brick Wall Sealer

Best Sealer for Brick Walls to Prevent Water Penetration

Bricks are used for many aspects of construction. They are considered as one of the strongest and longest lasting building materials in history. Bricks can be made of clay, concrete, stone, ceramic, or lime and sand. Like other exterior building materials, a brick wall should be sealed to slow the effects of weathering. When moisture is allowed to penetrate the brick, the damaging effects can cause cracking, breaking, crumbling, and efflorescence problems.

Sealing a brick wall will lock out unwelcome moisture and protect the bricks and mortar joints from damage. Unless you want to purposely change the appearance, the best sealer for brick walls is a non-gloss penetrating clear sealer. A siloxane-based formula like Masonry Saver Heavy Duty Water Repellent or SuperSeal M will penetrate deeply into most masonry brick walls for optimal protection.

The best sealer for brick walls should be breathable but will not promote peeling or flaking. The siloxane-based brick wall sealers have active ingredients that penetrate the brick pores up to ΒΌ inch or more. This not only protects the brick wall but also will not alter the appearance of it.

When dealing with the best sealer for brick walls, try to steer clear of acrylics, silicones, and similar types of waterproofing sealers that linger on the surface. These brick wall sealers tend to trap moisture vapors and may promote efflorescence, mold, mildew, and other damaging effects.

Finding the best sealer for brick walls is the key to superb protection and increased longevity of all types of brick walls. Regular maintenance including cleaning and sealing a brick wall will ensure it will be a long lasting building material that will not fail.

Questions on Sealing Brick Walls? Please Ask Below.

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48 responses to “Best Sealer for Brick Walls”

  1. Rich says:

    I have tried using brick sealers and applied then as per the manufacturers recommendations but after about 6 months they turn the bricks an opac white. I heard from a Masson that a high grade marine spar varnish would be good to seal the bricks and gring back the color as well as give the bricks a wet look. I tried a test area several months ago and the finish looks as good as it did the day after I sealed the bricks. I also heard of other uses for varnish inside on church stone floors and fireplaces. Can anyone comment on longevity of varnish on external bricks ?

  2. Kim Barbin says:

    looking for a sealer for interior brick floors

  3. Phyllis says:

    We have a metal building with a brick facade. The areas around the windows were not sealed when it was built and water is leaking in this area. Especially under the windows. When we ripped the sheet rock down, you see the back side of the brick. What is the best sealer for this purpose?

  4. Steve Mayer says:

    I have a brick chimney which when I get a huge rain I get a few drops of moisture in the house. What do you recommend to seal to prevent this from happening

  5. Chris P. says:

    Anyone have experience using RTV silicone rubber sealant?

  6. Elle says:

    What is the best way to seal a brick stoop and walkway? Can you use the same sealant on outside of brick chimney and brick on house?

    • Concrete Sealer Help says:

      Use a pump sprayer for applying the sealer. Look at Masonry Saver Brick Water Repellent. You an use it on the chimney and house brick.

  7. vivalaleta says:

    I actually do like the wet look for an exterior brick wall. Any advice on the best choice for this?

  8. MICHAEL BRYAN says:


  9. Gopalakrishnan says:

    Does spar varnish have Silanes and siloxane chemical content? Please give a reply

  10. Lorna says:

    I have an exterior backyard masonry brick patio. I would like to seal it for a wet look with no gloss. If I seal it, could future mold from winter rains permanently stain the brick? Also, since the brick is porous, I want to make sure the bricks don't discolor to white as some homeowners have mentioned.

    What would you suggest? And how often will I need to reapply?

    • Concrete Sealer Help says:

      Lorna, use the Supreme Shield SB-600. It will not turn white. Mold never permanently stains brick.

  11. Carol says:

    We have an exposed brick wall in our kitchen. We are looking for a sealant with a satin or semi gloss that will have a slight shine without being glossy. What would you recommend?

  12. A. Hall says:

    I have a basement from 1903 with a foundation of stone & mortar and brick and mortar. There is efflorescence present and radon. Poured concrete floor. I want to reduce or stop the moisture & radon migration from entering the basement. What product do you recommend?

    Located near Manchester, New Hampshire. Commercial dehumidifier present.

  13. KLW says:

    I am hoping to remove the plaster from a bathroom wall and keep the bricks exposed (opposite the bath/shower, no water will directly hit the wall). What is the best sealant to use? I'd rather not have it too shiny but don't mind if there is a little shine.

  14. lisa says:

    Is there a low/no VOC alternative to the siloxane product. looking to seal a wall of interior bricks in a lower level condo.

  15. Daniel Dean Walter says:

    This is a block concrete wall tan in color in Arizona.

  16. Redhouse says:

    I have a new build 6 months old house and live in Ohio,USA. Can I apply the sealer this year in fall ? What is the best brand for non gloss brick sealer which is siloxane based ?

  17. Jaime P says:

    I have a beautiful old (45 years) brick hearth and wall. I want to clean the bricks gently and seal them before we have a new free standing natural gas stove installed. I don't want shiny bricks, just a natural look that will protect them for years to come. Advice on product?

  18. DC Row Home says:

    I have 4 interior exposed brick walls in my house. 2 in bedrooms and 2 leading up staircases. The red brick is from 1915 when the house was built. We are looking to have it cleaned, the holes filled with mortar and sealed with a matte finish. What sealant do you recommend for this project? Thanks!

  19. Norman says:

    Hi – I have a 100 year old house with an exposed interior brick wall. Several bricks at the base or the wall are spalling and flakeing causing erosion. The bricks above 3 feet are all fine but I want to preserve the spalling bricks. No sealers that I have tried will bond to the interior terracotta. I was told to try marine spar to seal the damaged brick.
    Have you heard of this and will this work?

  20. MAW says:

    Your article states when dealing with the best sealer for brick walls, try to steer clear of acrylics, silicones, and similar types of waterproofing sealers that linger on the surface. These brick wall sealers tend to trap moisture vapors and may promote efflorescence, mold, mildew, and other damaging effects. What specifically do you suggest for outdoor brick steps (matte)?

  21. ICh says:

    which one is best to apply in the fall, northern brick wall. LAst rain about 5 days ago .

  22. B. Nagothu says:

    Hello! We have a 180 year old farmhouse built with stone and lime mortar. What breathable sealant would be best to use on the exterior walls? Also, we would like to achieve a wet look without being glossy. Sincerely appreciate your advice.

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