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Lally columns do require some kind of footing to ensure they have a strong enough base to provide the support they need to deliver, and, at the very least, they need to attach to the floor below. Some contractors will just use the existing foundation as a footing for temporary Lally columns, while some circumstances demand that the expert install a new footing. You might need a local structural engineer to weigh in on which is best for your project.

Dry pour concrete cures in the same amount of time as wet pour concrete, so you’re looking at four to six hours for it to harden, 24 to 48 hours before you can remove forms and expose the slab to foot traffic, a week before it can stand up to vehicle traffic, and about a month for it to be fully cured.

No, hairline cracks in concrete are generally not a problem as they do not impact the strength and longevity of the concrete. Generally, cracks less than 0.3 millimeter wide don’t impact the structure. Hairline cracks can grow over time and weaken the structure, such as in a home foundation. Some hairline cracks can also cause leaks in a foundation. It’s important to watch the cracks to see if they grow. Contact a concrete contractor if you notice cracks exceeding 0.3 millimeter wide.

Placing either a layer of mixed-size gravel or a paver base under your crushed concrete driveway is a good idea. The smaller pieces will compress and prevent the larger pieces of concrete from driving into the soil below, helping to avoid sinking over time under the weight of vehicles. For added protection from sinking and weeks, you can also install a heavy-duty weed liner beneath the gravel or paver base. Just be sure to use a permeable material to avoid drainage problems.