How To Repair Cracks In Foundation

Outside of hairline cracks, larger stress cracks occur when a house settles or the ground below it shifts. These types of cracks don't usually pose a threat to the structural integrity of a house, but they exercise let for a potential opening for groundwater, insects and radon gas.

We'll show you a simple and effective way to patch cracks with the all-time concrete crevice filler.

Fix Concrete Cracks in 8 Steps

Step ane: Repair a Foundation Crack With an Epoxy Sealer

Photo Geoffrey Gross

We repaired a foundation wall, which had an eight-ft.-long crack that leaked water into the basement during periods of heavy rainfall. To permanently patch the crack we used an epoxy-injection system from Polygem, called the Liquid Physical Repair Kit (about $60).

Each kit contains a two-office epoxy crack sealer, two ten-oz. tubes of Liquid Concrete Repair (LCR), a mucilaginous epoxy that comes in a caulk-type cartridge, and 7 plastic injection ports that deliver the LCR deep into the crack. There's enough material in each kit to repair a 1/16-in.-wide 10 8-in.-deep x viii-ft.-long crack.

Before you offset, check to brand certain the crack is dry. If the crack is slightly clammy, dry information technology with a blow-dryer, so wait fifteen minutes. If information technology remains dry out, go on with the repair. Even so, if the dampness returns, water is still seeping into the crack and you'll have to wait for it to dry out on its own.

First, scrub the crack make clean of any loose concrete, paint or former crack filler using a wire castor. Remove all dust and debris with a shop vacuum.

Pace ii: Block Out the Injection Ports

Photo Geoffrey Gross

Tap 3-in. (10d) finishing nails partway into the crack, spaced 12 in. apart. You'll use them to align the injection ports with the crack.

Step 3: Mix the Epoxy Sealer

Photograph Geoffrey Gross

Open up the 2 containers of epoxy crack sealer and scoop out equal amounts of Role A and Office B; utilize two divide sticks to avoid contamination. Mix the two parts on a fleck board using a clean putty knife; blend until you achieve a uniform gray colour.

Stride 4: Attach the Injection Port

Photo Geoffrey Gross

Spread some sealer onto the base of i of the plastic injection ports, being careful not to plug up its pigsty. Slide the port over i of the nails sticking out of the scissure and printing it to the wall. Install the remaining ports in a similar mode.

Footstep 5: Spread Sealer Along the Crack

Photo Geoffrey Gross

Next, mix up a slightly larger batch of epoxy sealer and utilise it to the entire fissure using a ane ½-in.-broad putty pocketknife or margin trowel. Spread the sealer about one/eight in. thick and 1 in. on either side of the cleft. Besides, cover the unabridged flange of each injection port with scissure sealer, leaving only the extended neck portion showing. Shine out the sealer and plumage its edges with a paintbrush dipped in mineral spirits.

Step six: Inject the Epoxy into the Scissure

Photograph Geoffrey Gross

If the other side of the wall is accessible, see if the crack goes clean through. If information technology does, seal information technology up with crack sealer, too. Allow the sealer to cure for 6 to x hours earlier injecting the epoxy. Thoroughly mix the LCR epoxy using the plunger rod that comes with the kit. Place the LCR cartridge into a caulk gun. Starting at the lowest injection port, dispense the epoxy into the crack. Continue squeezing the trigger until epoxy begins to ooze out of the port directly higher up.

Pace 7: Seal Upwards the Injection Ports

Photograph Geoffrey Gross

Remove the gun and plug up the port you lot simply filled. Now insert the cartridge tip into the port that's oozing and squeeze the trigger to dispense the epoxy. Repeat this procedure for the remaining ports; plug upwardly each i before moving on to the next.

Footstep 8: Cutting Away the Injection Ports

Photo Geoffrey Gross

Allow the LCR to cure for five days, then cutting off the necks of the ports with a hacksaw. If desired, you can patch the severed ports with a little crack sealer.

Resource:

Polygem
Box 609
Dept. TH700
W. Chicago, IL 60186
Polygem
630/231-5600

Source: https://www.thisoldhouse.com/masonry/21016504/fixing-cracks-in-concrete

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