How to Select Concrete Anchors
Concrete anchors are hardware devices used to fasten objects to concrete, stone, brick, or block. They may be used by homeowners or builders and can vary in size, shape, and design depending on the application. To ensure a safe and secure installation, it's important to match the right concrete anchor to your project. When choosing these anchors, consider features such as the type of object being fastened, the substrate it is being fastened to, the forces being applied, and the desired finish and appearance of the installation. Does this Spark an idea?
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Instructions
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Evaluate the material you are fastening the object to. Almost any type of anchor can be used in concrete because of its high strength and density. Because brick and block are not always as strong as concrete, wedge anchors and drop-in units should not be used.
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Consider the weight of the object you are fastening. As a general rule, the heavier this object is, the larger the concrete anchor will have to be in terms on both length and diameter. See the Resources section for more information on sizing these anchors.
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Determine where the anchor will be used. For indoor applications, standard zinc or steel anchors are sufficient. If the anchors will be used outdoors, choose galvanized or stainless steel anchors that can withstand weather and temperature changes. If the anchors will be exposed to chemicals or corrosive materials, choose stainless steel anchors.
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Look to see whether the objects being fastened are hollow-core or solid. For hollow objects such as drywall, plaster, or hollow blocks, choose mechanical fasteners. For solid objects, such as two different stone products fastened together, select wedge or expansion anchors.
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Think about the type of forces that the object will be subjected to. For objects subject to shear forces (force parallel to object, such as wall-mounted items), consider using mechanical fasteners or hammer anchors. For objects subject to impact or tensile forces (perpendicular forces, such as floor or ceiling-mounted objects), choose expansion anchors such as sleeve or wedge units.
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Decide whether the appearance of the anchor is a factor. "Male" concrete anchors have unfinished heads that can create an uneven, unfinished appearance. These include units like strike and wedge anchors. "Female" anchors tend to have a finished head that results in a more pleasing appearance. Female anchors include drop-in anchors, expansion bolts, and machine screws.
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