To Overlay or Not to Overlay

By Chris Sullivan – ChemSystems, Inc.

Question:

I am getting ready to resurface concrete in front of two double garage entries. I have been told to have the concrete resurfaced with an acrylic overlay. But I have an estimate from a contractor to resurface using a cement-based overlay. I don't know which type of overlay to use or if an overlay is even the best remedy in this situation. Please help.

Answer:

The first question needs to be: What is the end result you are trying to achieve? An overlay will work in this situation, but so could other less costly methods. I am going to assume that you have settled on using an overlay because the existing driveway is damaged or has flaws that need to be covered. But if you only desire to dress up the surface, many different types of stains and solid-color toppings are available that will do just that. The important thing to remember is that these toppings just change the color of the existing concrete and will not correct the profile or hide damage.

If the concrete needs a new surface, a thin-section overlay, often called a "microtopping," is a good choice. As with any overlay, surface preparation is the most important factor. A clean, properly profiled surface is critical for good adhesion. Other important factors include selecting the right material for the job and hiring an experienced applicator. Not all overlays are designed for exterior use. Ask to see a spec sheet for the product being applied, and feel free to contact the manufacturer to make sure the material will work in this scenario. No matter which direction you go, have your applicator provide references of previous jobs and a written warranty. Also ask to have all maintenance procedures and life-time performance expectations put down in writing before moving forward. A good applicator using a quality overlay material can provide a new surface that will last for decades.

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