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Question DetailsAsked on 8/20/2016

What materials should I use to repair cracks in a stone patio?

We just moved into a home in Denver, CO. The stone patio has a couple apparent surface cracks that I would like to repair before winter. I do not know what type of stone or mortar material was used. What material should I use to fix it?

On a related note, there are some drilled holes in the patio where a fence post was once mounted. What material should I use to fill these?

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Depends on color of stone, and how close a match you want. Plain patching cement mix (available in containers down to a pint from Dap and others) will give you a concrete gray patch - mix to thick pancake/cake batter consistency and rod down into the holes, making sure you rod it enough to get the air out. Can also be used for cracks - tape along edges of crack to control mess, use putty knife or spatula to force into cracks (make thin waffle batter consistency for thin cracks and use rag or sponge to force into cracks), then wipe up at diagonal towards the crack from each side (to avoid smearing it all over and at diagonal to avoid wiping the grout out of crack) with wet sponge to clean up, strip the tape, let dry 15 minutes or so or until it starts looking dry rather than damp, then use damp sponge (wring out in water after every pass) to wipe excess or grout haze off the stones along the sides of the crack, avoiding wiping the crack itself.

For small cracks there is also gray acrylic latex "concrete caulk" in a caulk tube you can use - cut tip at a fairly flat angle (about 45 degrees) with small tip opening, then hold tip tight to crack on cut beveled edge while moving and squeezing so it forces the caulk into the crack under pressure. Same cleanup as with grout above except start with a putty knife to remove any excess ridges or globs before starting to wipe so you don't smear them out over the stone. Concrete caulk might work for bolt holes too if not real big - probably take a couple of applications over several days as it will likely sag in the hole.

A pro would use a scrap of matching stone or find a spot normally buried or out of sight along ther edge of the patio and use a portable grinder to produce a small pile of stone dust to sprinkle over and press into the wet caulk/grout after it is put in and cleaned up, to provide a color match. Do grouting/caulking complete ready to dry, then sprinkle trail/layear of stone dust over it and press in with a flat board (scrap of 2x4 works well) and let sit till cured, then brush or wash off residual stone dust a couple of days later, using a scouring block or a wood block to rub down any high points.

Answered 2 years ago by LCD




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