We talked with three professionals to get their take on painting brick. Diana Zumeta of Brick Restoration, Scott Crocker of Crocker Breslin Architects and Rick Watson from Sherwin-Williams give us their two cents on the risks involved in painting brick.
Should you paint your brick?
The quality of your brick also should determine your choice. Brick that’s chipping, deteriorating, molding or in overall poor condition is always a bad candidate for paint. Paint blocks the natural pores in the brick’s surface, which can cause existing problems to become exaggerated over time. “When water seeps in through the mortar, it also seeps into the brick through the inside, and since the bulk of the surface area is blocked, the moisture cannot evaporate off,” says Zumeta. Often this causes the paint to chip off.
Also remember that removing paint from bricks is no easy process. Chemicals have to be used, and often the paint won’t come completely off. If you don’t like the look, you may be stuck with it.
Moisture is a concern that’s usually apparent right off the bat. Water can enter brick through brick pores, incomplete mortar joints, sills, copings and other gaps. Make sure your brick is completely dry before you paint it — the risk of long-term or immediate damage is less likely.
The natural chemical property of bricks may affect your paint’s durability as well. According to the Brick Industry Association, most bricks are neutral, but mortar often has a basic alkalinity. Paint products can be affected, so alkaline-resistant primer is usually recommended.
“Efflorescence” is a big word for that annoying white residue that often appears on older brick walls. This residue is made up of deposits of water-soluble salt buildup, often from moisture inside the brick. Remove the efflorescence with water and a stiff brush before painting your brick, and wait to see if it returns. If it does, you may have a bigger problem on your hands that requires professional help.
How to prep brick for painting
Always clean brickwork before painting it, and allow it to dry for at least 24 hours before painting it or applying a water repellant. Don’t use acid cleaning solutions when cleaning your brick — stick to simple water and soap. Acidic solutions can result in paint chipping.
Seal any cracks and repoint (renew the external mortar joints, or pointing) when needed. Get rid of efflorescence, wash off dirt and eliminate mold with weed killer.
The best paint for brick
Zumeta recommends looking into having your brick professionally stained, rather than painted. Although it can be more expensive, a brick stain penetrates the pores of the brick, unlike paint, which simply sits on the surface. It creates new color without some of the long-term risks that come with paint.