Brick & Masonry Sealing
Brick & Masonry Sealing
Breathable sealing that keeps water out without trapping it in.
Brick & Masonry Sealing in Lexington, KY
Masonry sealing in Lexington, KY protects brick and mortar from the freeze-thaw cycle that does most of the damage to this area’s older, more porous brick stock. Lexington Masonry Pros applies breathable penetrating sealers that keep water out of the wall without trapping the moisture already inside it.
Does Brick Need to Be Sealed in Lexington, KY?
Not every brick wall needs sealing, but freeze-thaw cycles and older, more porous Lexington brick make it a smart preventive step against water damage.
Water that soaks into brick or mortar joints and then freezes expands as ice, and that expansion is what causes the spalling and cracked joints covered on our brick foundation spalling and cold-weather masonry repair pages. A breathable sealer cuts down how much water the wall absorbs in the first place, which is a cheaper fight than repairing spalled brick after the fact.
The sealer has to be vapor-permeable, not just water-resistant. A film-forming coating that blocks water from getting out as well as in can trap moisture already inside the wall, and that trapped moisture does the same freeze-thaw damage from behind the sealed face instead of the front of it. The National Park Service’s guidance on water-repellent treatments covers this trade-off in detail, including when a repellent treatment is and is not appropriate for a given wall.
Sealing vs. Tuckpointing
Sealing is preventive maintenance for masonry that is already in sound condition. It does not fix mortar that has already failed, cracked brick, or an open joint — that is tuckpointing and repointing work, and it needs to happen first. Sealing a wall with failing mortar just locks the existing moisture problem in place.
What Does Masonry Sealing Cost?
Typical ranges run about $0.50–$1.50 per square foot for a breathable penetrating sealer on most brick or block walls, or roughly $300–$1,200 for a single chimney, small retaining wall, or porch, with a full exterior running $1,500–$4,000+ depending on square footage and access. Those are typical figures, not a quote — surface prep, height and access, and how porous the existing brick is all move the number.
Common questions
Will sealing stop my chimney from leaking?
Not on its own. If the leak is coming from a cracked crown or damaged flashing, that has to be repaired first — see our chimney leaking when the roof is fine page. Sealing is prevention for sound masonry, not a fix for an active leak.
How often does masonry need to be resealed?
Most breathable penetrating sealers hold up for roughly five to ten years depending on the product and how much sun and weather the wall takes. South- and west-facing walls tend to need it sooner than shaded ones.
Can sealing make a water problem worse?
Yes, if a non-breathable coating goes over brick that already has moisture trapped inside it — that moisture has nowhere to go and does damage from behind the sealed face. A breathable sealer applied to dry, sound masonry is the safe approach.
Related: brick foundation spalling causes · cold-weather masonry repair · tuckpointing & repointing. Back to Lexington Masonry Pros.
Lexington Masonry Pros · Serving Lexington, Nicholasville, Georgetown, Versailles & Fayette County, KY · Call or text (859) 310-1209
Last updated September 6, 2026