How To Repair A Brick Wall When A Brick Falls Off

Fifty-fifty the most cute brickwork is only and so much rubble without a bed of mortar to seal and hold it together.

What Is Mortar Repointing?

When mortar starts cracking, receding, and falling out of the joints, information technology's fourth dimension to chisel out the quondam stuff and trowel in the new, a process called repointing. This is a simple task, but it has to be done with care, using the correct tools and the right materials to avoid damaging the brick and permanently compromising the integrity and appearance of the wall. For me, that means using mitt tools and lime mortars similar to the ones masons employed 100 years ago.

Tin Yous Mortar Over Old Mortar?

If your brick is fifty years old or less, you can probably repoint information technology safely with modern, portland cement–based mortar (although the guy doing the next repointing, who'll have to grind it out, may curse your decision). But if your business firm was built before World State of war II, the mortar is probable a mix of lime putty and sand, and you should try to match it. Otherwise, over time, every bit the soft old brick swells and shrinks against the stone-hard mortar, the bond between them will break, moisture will get trapped in the wall, and the brick faces will start popping off. Traditional lime mortar acts like a absorber, flexing with the brick'due south motion while allowing moisture to migrate easily out of the wall.

A restoration mason can clarify erstwhile mortar and make a compatible mix, or yous can send mortar samples to companies such equally U.S. Heritage and get a custom blend with the aforementioned color and characteristics. You can choose between hydraulic lime, which comes in bags and hardens when it reacts with water, much like portland cement, and lime putty mortar, which comes in buckets and slowly hardens past reacting with carbon dioxide in the air.

How to Mortar Bricks in 6 Steps

Footstep 1

Rake Out the Bed Joints

Scrape out the horizontal joints to a depth of at to the lowest degree ¾ inch. (Joints wider than ½ inch accept to be deeper: two½ times the joint'southward width.) A carbide-tipped grout saw works well on these ¼-inch-wide "butter joints." (On wider joints, utilize a common cold chisel and an engineer's hammer.) Avoid electrical bending grinders. Unless you lot're trained to use them, they're almost guaranteed to cut into and disfigure the brick.

Footstep two

Clean Out the Head Joints

After removing three or four courses of bed-joint mortar, dig out the vertical joints. Exist careful not to hit the edges of the bricks above or below. Here, the old mortar is beingness chiseled out past tapping a 5-in-one painter'south tool with a hammer.

Step 3

Wash Down the Wall

Person washing brick wall to prepare apply mortar.

Whisk away all the crumbly debris with a stiff-bristled brush, then check that the bract of your tuck-pointing trowel will fit into the joint. If the blade is besides wide, grind it down with an abrasive wheel. Mist the wall with water until the brick is thoroughly clammy and starts to drip; this is a critical step considering dry materials will suck the moisture out of the new mortar and prevent it from curing properly. Await until the next twenty-four hours earlier filling the joints.

Step 4

Mix the Mortar

Mist the brick again. Then, following the directions on the bag, stir water into the dry mix until information technology reaches the consistency of peanut butter and clings to an upended trowel. Wait until a movie of water forms on the mix, about 15 minutes. Stir the water back in. The mortar is now ready to utilise and remains workable for eight hours. If it gets besides dry in that fourth dimension, yous tin "retemper" it occasionally by calculation water.

Step 5

Fill the Joints

Scoop a dollop of mortar onto a brick trowel or hawk, hold it upward fifty-fifty with a bed joint, and push the mortar against the dorsum of the joint with the constrict-pointing trowel. Eliminate voids with a few slicing passes of the trowel's edge, then add more than mortar until the joint is filled. Once yous've finished three or four courses of bed joints, go dorsum and make full the head joints. Finally, smooth and compact all the mortar with the trowel's flat confront and scrape the backlog mortar off the brick.

Stride 6

Brush the Wall

Person brushing brick wall with stiff bristle brush.

When the mortar is firm to the bear on, brush diagonally across it to remove whatsoever dry out mortar crumbs. (Brushing in line with the joints can pull out the fresh mortar.) Then carefully sponge mortar residue off the brick faces. For the next three days, utilise a tarp to protect the soft joints from the lord's day, current of air, or hard rain, and give the wall a daily misting to keep the brick and mortar moist.

Tools You'll Need

Source: https://www.thisoldhouse.com/masonry/21016676/how-to-repair-mortar-in-a-brick-wall

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