How to Repair a Damaged Brick Chimney

Chimney Brick Repair

Repair Chimney Bricks.

Chimney Brick Repair

Brick Repair Instructions

Bricks flake, peel, crack and

The cause is usually water
seepage into the brick interior,
which freezes, causing cracks,
chipping, and flaking.

It is important to repair the
damaged area of the bricks
before more water enters,
and causes further damage.

Inspect the capping around
the top of the chimney for
any cracks or missing

If there are cracks, clean
and coat the entire top
surface with a new coat
of concrete.

When working on the chimney,
place drop cloths around the
chimney, on the roof to
catch any falling bits of
broken bricks, and concrete.

Use a chisel and hammer,
and remove all the unstable,
loose pieces of concrete,
broken or cracked pieces
of brick from the chimney.

A solid base is necessary to
make lasting repairs.

To work on the veneered type
brick (thin slices), make
up a couple of jigs to help
repair the broken bricks.

Cut a couple of wooden strips
1/4 inch by 1/4 inch.

Measure the length and height
of the brick to be repaired,
and build the jig to fit the
chimney ( see photo).

Use fine finishing nails to
assemble the wood strips,
pre-drill the holes for
the nails.

Mix up a water mixture, at
a ratio of one portion of bond
well glue, or another
equivalent cement bonding
agents, to six portions of

Mix well and paint all the
damaged chipped, flaked
brick areas, just before
you apply the premixed

Add what is left of the glue
solution, to the dry,
premixed bonding cement
mixture, this will make the
concrete water resistant.

Mix the cement so that
it is fairly stiff, but still wet
enough to stick well.

Place the jig onto the
chimney bricks (friction fit),
and use the premixed high
bonding concrete fill up
the hole, to the top of
the jig.

Trowel off any cement above
the jig, then by drawing the
trowel over the jig, with the
trowel at an angle, this creates
the design to make the
brick look natural.

Wait 5 to 10 minutes to allow
the cement mix to stiffen,
draw the trowel along the
surface of the jig, for the
finished look.

The steeper the trowel angle,
the rougher the surface
becomes; scraping it across
the top will give it a rough
grooved, brick-like texture.

If you have more than one
flaked brick to repair, work
on two bricks at a time.

Allow those two brick repairs
to set up before doing more.

Wait about half an hour for
the concrete to set up (cure),
before gently removing the jig.

Run your trowel or knife
around the inside edge of
the jig and slowly remove
the jig.

Wait another half hour after
the jig is removed before
lightly washing.

Carefully wash down the
bricks around the repaired
area with water, and a
brush, to remove any
splashed concrete.

Clean up any spilled
concrete, on the roof.

If you want a contrast looking
brick, go with the natural
color of the concrete.

If you want to match the
repaired brick color to
match the other bricks,
add color into the patch
cement, or paint the
repaired area at a later
Cinnamon color is about
the same color of the bricks
shown here.

Spray the repaired area lightly
with water for a couple of days
to prevent the mortar from
curing too quickly.

If the area is in direct sun,
cover it with cardboard, or
plywood to provide shade.

Chimney repaired and painted


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