Cracking or spalling in bricks may occur when the wrong type of mortar is used. There are no easy solutions; you may need to either replace all the mortar or rebuild the wall.
By the DIY experts of The Family Handyman Magazine:February 2011
If the bricks in your siding or brick wall are breaking apart, simple patching probably won't work. Any patch material
you apply will just
pop out again unless
you solve the underlying expansion/contraction problem. The bricks in this photo, which are recycled Chicago-commons (a
soft brick used at the turn of the
last century) are cracking because they were set
with one of the newer, nonflexing
Portland cement mortars. The bricks move slightly with changes in weather, but the mortar doesn't.
If you have a problem like this, there are two choices. Either reuse the old bricks but with the
right mortar (lime mortar or lime putty), or rebuild with new bricks.
Pick a brick that's harder and more weather resistant.
Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.
Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.
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