Glass Block Repair in Memphis
Cracked glass blocks, failed mortar joints, and leaking glass-block walls and windows repaired by family-owned Madewell Masonry — matched to the existing wall, not patched over.
The Block Cracks. The Joints Fail. The Wall Still Stands.
Glass block is masonry, not a window replacement product. Each unit is set in mortar like a brick. When one block cracks, or the joints wash out, the rest of the wall can still be sound — which is why a full tear-out is almost never the first honest answer.
What we do is the same work we do on brick: take out what has failed, match the replacement, and rebuild the joint. A single cracked unit can come out. Failed mortar can be cut back and packed again. The wall stays in place, and the repair disappears into the grid.
- Cracked or broken glass block replacement
- Failed mortar joints cut out and rebuilt
- Leaky glass-block walls and windows
- Interior and exterior glass-block panels
- Pattern-matched replacement units
What Is Glass Block?
Glass block is a hollow, mortar-set masonry unit. Mid-South homes and offices use it for privacy walls, basement windows, bathroom windows, and interior partitions that need light without a clear view. The units come in patterns — waffle, ribbed, frosted — and they are laid in a grid just like brick.
That is why a glass company is the wrong first call when a block cracks or the joints leak. The failure is in the masonry: the unit, the bed, or the joint. Replacing the whole panel because one block broke is the same as tearing down a brick wall because one brick spalled.
Not a window shop job
Glass-block walls are structural masonry. They need a mason who can cut a unit out, match the pattern, and rebuild the joint so the panel stays watertight and in plane.
When Glass Block Needs a Mason
Call if you see any of these. You do not have to decide whether it is one block or the whole wall — that is what the estimate is for.
- A cracked or starred unit — a hairline can run the full face. Once it is open, the block is finished.
- Open or crumbling mortar joints between units. Water and air go through the joint long before the glass does.
- A leak at a basement or bathroom glass-block window after rain. The joint or the perimeter seal has failed.
- A unit that has shifted out of plane — it sits proud or sunk compared with its neighbors.
- Condensation or standing water inside a hollow unit. The seal on that block has broken; it needs to come out.
One block vs. the whole wall
If the surrounding units are sound and the grid is still in plane, we replace the failed block. If joints have failed across the panel, we rebuild the joints. We will tell you which one you have.
How We Repair Glass Block
The same masonry discipline we bring to brick, adapted to a wall that has to stay light-tight and watertight.
- Read the panel. We check which units are cracked, which joints have washed out, and whether the grid is still in plane.
- Match the unit. Pattern, size and face (waffle, ribbed, frosted) have to match or the repair reads from across the room.
- Cut the failed block out. The mortar around it is ground out so the neighbors stay put. The cracked unit comes out in pieces if it has to.
- Set the replacement. New block goes in on a proper mortar bed, aligned with the existing grid.
- Rebuild the joints. Failed joints are cut back and packed full — not smeared. That is what keeps the wall watertight.
- Tool and clean. Joints are struck to match the original profile and the face is cleaned so the new unit does not announce itself.
What we will tell you
If one block is the whole job, that is the quote. If the joints have failed across the panel, we will say so before we start, not after the first unit is out.
Related work
Failed mortar on brick, not glass? See tuckpointing. Cracked brick or stone nearby? See brick and stone repair. Water coming in around masonry? See masonry leak repair. Full list on masonry services.
Glass Block Repair Questions
Usually yes. If the surrounding units are sound and the grid is still in plane, we cut the failed block out and set a pattern-matched replacement. A full panel replacement is only needed when the wall itself has lost bond.
Yes. Basement windows, bathroom windows, and interior partitions are the same masonry. Cracked units and failed joints get the same repair.
Most leaks come through washed-out mortar joints or a failed perimeter seal, not through the glass. Rebuilding the joints and resetting the failed units stops the water. Caulk over an open joint is temporary.
That is the standard. We match size, face pattern (waffle, ribbed, frosted) and joint profile so the new unit does not read as a patch from across the room.
It is masonry. Glass block is a mortar-set unit. Taking a panel apart and putting new glass in is a different trade. Replacing a cracked block and rebuilding the joints is a mason's job.
Yes. Interior partitions and light walls get the same unit replacement and joint rebuild as exterior panels. The work is cleaner indoors; the masonry is the same.
Ready to Protect Your Home? Let's Talk.
From a crumbling chimney to a hairline mortar crack, Madewell Masonry gives you an honest assessment and a fair price — backed by 40+ years of experience and a 10-year guarantee on our workmanship.