Sidewalk Surgery

Replace crumbling concrete yourself and save hundreds

- Tom Dvorak

Concrete work is hard labor. But for small jobs, I usually find I can do it myself—and for about one-third the contractor’s bid.

This sidewalk is a typical example. The materials and mixer rental cost about $200; a pro would have charged me at least $600. So I saved 400 bucks—not bad! You can do the same. Experience with concrete isn’t necessary, but you will need tool know-how and a strong back. You can follow the steps here and find much more info at familyhandyman.com. Just search for “concrete.“

1 DIG DITCHES

Trench along both sides of the walk at least 6 in. wide and 6 in. deep. These trenches will allow you to set up forms later.

2 CUT A CRACK STOP

When you break up the bad section, a cut that’s at least 1-1/4 in. deep will prevent cracks from spreading to the good section. An existing groove in the concrete is usually the best place to cut. Cut with a diamond blade in a circular saw or an angle grinder.

3 BUST UP THE BAD SECTION

A small section of sidewalk usually doesn’t require a jackhammer rental; try a sledgehammer first. A mattock is perfect for prying up broken concrete. Remove the chunks. For more concrete-busting tips, search for “concrete demolition” at familyhandyman.com.

4 PLACE THE FORMS

Select straight 2x4s for the forms and drive stakes every 24 in. Position the forms even with the adjoining sections of sidewalk, then drive screws through the stakes into the forms. The forms should feel rocksolid. If not, add stakes.

5 TRIM OFF THE STAKES

Cut the stakes flush with the forms with a handsaw or recip saw. Then span the forms with a 2x4 and slide it along the length of the forms. It should slide smoothly without hitting obstructions.