I’d then use the caulk that the pros use on institutional and commercial buildings. What I’d do if I were you is to clean out the gap to a depth of about 3 inches. Asphalt-saturated fiberboard was the staple expansion joint material of choice for years. When installing a new slab against an existing one, many concrete masons put expansion joint material between the two slabs. You need to fill it with something that’s flexible. For this reason, forget about filling the gap with a hard repair compound that’s cement based. It’s important that the gap between the two slabs be filled with a material that can absorb this motion, as slight as it might be. If you keep the interior of your home at the same temperature throughout the year, your house slab is quite stable and static with respect to size. Since the patio can receive direct sunlight and get rather hot during the day when the summer sun bakes it and the slab your home sits on is shaded, the two pieces of concrete expand and contract at different rates. Concrete, like just about any other material, can expand and contract as the temperature goes up and down. In the building world, many of us call that gap an expansion joint. But before we do, let’s discuss the gap you’re wanting to fill and why it’s important that you do this job right. I do have two videos at the website that got very close to answering your questions, so let’s start there. There are simply so many aspects of home building and maintenance that need to be covered in great detail with video. I discovered in a short amount of time that I could tape all day everyday until I die and not get five percent of the videos finished that need to be done. I sat down one day and made a list of all the videos I’d love to tape. Should I use a grinder to knock that down? How would you deal with this set of problems? Jeff H., Simi Valley, CAĭEAR JEFF: Thanks Jeff for checking out my videos! I’ve got hundreds there about lots of topics. My guess is the concrete mix was soupy and the installers didn’t take the time to finish the slab correctly. There’s a lip on the patio that’s raised up. I’m trying to determine whether to caulk the crack or fill it with some cement-based patching compound. There’s a wide ugly gap between my concrete outdoor patio slab and the slab my house is built on. Photo Credit: Jeff Hileman Patio Slab Crack RepairĭEAR TIM: I spent some time at your website but couldn’t locate the exact video that answers my question. The unsightly gap to the right of the sliding screen door is supposed to be there.
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