Bricks offer a range of advantages as building materials, including classic aesthetic appeal, durability, fire resistance and energy efficiency. Seal exterior bricks to prevent damage caused by moisture such as efflorescence, flaking and separation of mortar and bricks. Siloxane brick sealers deeply penetrate the pores of bricks to create a chemical bond that shields the bricks while still allowing them to breathe. Non-glossy, siloxane sealers also will not compromise the natural texture or color of the brick.
Things You'll Need
- Phosphoric acid cleaner
- Scrub brush
- Dry mortar pre-mix
- Point trowel
- Jointer tool
- Plastic sheeting
Repair and clean older brick walls before sealing. Chisel away any loose or crumbling mortar. Wash the bricks and mortar, scrubbing with phosphoric acid cleaner. Patch areas of excavated mortar with dry mortar pre-mix, using a point trowel. Smooth down the mortar joints with a jointer tool. Allow the mortar to fully cure.
Mask any surrounding, non-masonry surfaces, using tape and plastic.
Fill a hand-pump sprayer with siloxane brick sealer. Do not dilute unless the manufacturer recommends it. Pump the handle to build the pressure.
Apply a light tack coat when sealing a wall. The tack coat is not necessary for floors. Pull the trigger to release a mist of sealer. Hold the nozzle at least 6 inches from the surface. Start at a corner (a top corner for walls) and work in left-to-right and up-and-down, continuously-moving, sweeping motions. Apply the sealer minimally, in slightly overlapping rows. Do not allow the sealer to puddle or drip.
Apply a second, more generous "flood" coat. Begin with the flood coat, if sealing a floor. Work in the same manner as the tack coat but saturate the bricks with a greater amount of sealer.
Apply one more coat of sealer if the brick is in an area that sees unusually large amounts of moisture.
Tips & Warnings
- Choose a day to apply sealer that is dry, with moderate temperatures.
- For smaller projects, you can use paintbrushes or rollers instead of a sprayer.
- Photo Credit Jupiterimages/Creatas/Getty Images
How to Seal a Brick Wall
Brick walls are sturdy structures that are not only functional in weight support, but ruggedly aesthetic. Brick walls can be found inside...
How to Seal a Brick Fireplace
A fireplace surrounded by brick adds warmth and a cozy feeling to a room. Brick fireplaces may require sealing to keep moisture...
How to Seal Brick on a Chimney
Sealing bricks on a chimney creates a waterproof barrier preventing water from leaking into your home. Some water leaks are ambiguous and...
How to Seal Mortar
Mortar is a type of building material made of cement, sand, limestone and water commonly used to bond block and brick. As...
What Kind of Sealer Do You Put on Brick?
A well-built brick wall shouldn't leak. The proof of this is seen in the many antique brick buildings constructed before commercial sealants...
Can I Seal My Patio Bricks?
Whether or not to apply a sealer to a brick patio is strictly a matter of choice and preference. While some people...