CONCRETE BLOCK REPAIR CRACK

Repeat the filling and finishing process daily, section by section, until the entire crack has been filled. Let it dry for 1 day and remove the mask finish the grout to match joints and brick or block. Using the wide-mouthed funnel, pour the grout into the crack as before. Mask the crack with duct tape and wedge the board back into place against the wall. Working quickly, spray the crack lightly with a garden hose. Mix a bucketful of grout in the same proportions as before.

Use a mortar jointer - or thin metal rod bent to form a handle - and a trowel to finish the crack, matching both joint and brick or concrete block textures. Then remove the board and the duct tape from the crack. Let the partially filled crack set for about 1 day. Rinse the funnel, the tubing, and the bucket thoroughly. Pour grout slowly into the funnel to fill the bottom of the crack. Hold the end of the tubing at least halfway into the crack and as near the bottom as you can reach over the board wedged against the wall. Push one end of the tubing over the narrow end of the funnel and set the open end into the crack. Use a wide-mouthed funnel and a length of rubber tubing to fill the crack you'll need a helper for this. Set a wide board flat against the wall to hold the tape in place, and wedge it firmly upright with a 2 × 4. Mask the lower third of the crack with duct tape set flat over the opening. Add mortar coloring, testing the mixture on a scrap of corrugated cardboard, to match the color of the old mortar then mix a bucketful of grout in the same proportions.Working quickly, spray the inside of the crack lightly to dampen it. Mix the dry materials and add water slowly to form a thin, easily pourable grout.

Mix a small amount of filler, using 1 part Portland cement,1 part hydrated lime, and 6 parts sand. Wearing safety goggles, chisel out, wire-brush, and flush the crack with water to clean it thoroughly. Spray the patched area lightly with the garden hose several times a day during the curing period.When the crack is very wide and deep, fill it with a thin grout mixture. Let the crack cure thoroughly for at least 1 week. Match the old joints where the crack follows a joint: trowel the mortar to match the surface where the mended surface is block or brick. Treat the crack as one long joint, filling cleaned-out joints and the gaps in broken bricks or concrete block evenly all along the crack.When the crack is solidly packed with mortar, finish the surface with a jointer and the trowel.

CONCRETE BLOCK REPAIR FULL

Fill the crack with mortar using a small, sharp trowel to force the mortar into the full depth of the crack.

When the dried test batch matches the old mortar, mix enough mortar to fill the crack and add coloring in the tested proportion.Spray the crack thoroughly with the garden hose. Add mortar coloring to the mortar as necessary to match the old mortar, experimenting with the cardboard as you add coloring. Spread a little mortar on a scrap of corrugated cardboard, where it will dry quickly and reveal its true color. Mix a small amount of mortar according to the directions on the package. Wire-brush the crack, inside and out, to remove debris, then flush it thoroughly with water from a garden hose.Cracks that affect only a single layer of brick can be filled with mortar. Enlarge the crack to a consistent width and clean the inside of the crack to its full depth, or as far in as you can reach. Where the crack runs through a brick or a concrete block, use a brick chisel, angled into the crack, to widen and undercut the break. Time: about 3 to 4 hours for cleaning and initial filling additional time depending on extent of damageWearing safety goggles, begin by cleaning all crumbling brick and mortar from the crack with a cold chisel and sledgehammer.

Concrete block repair