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The number of concrete bags you'll need depends on the width and length of your fence post hole. A 50-pound bag makes about 0.375 cubic feet of concrete. So, if your hole is 30 inches deep and 12 inches wide, you'll probably need around five 50-pound bags for each post.

With proper maintenance, exterior concrete steps can last 25 to 50 years or more. In most cases, your steps will require some minor repairs over that time frame, including sealing surface cracks and resurfacing to keep them in good condition. Interior concrete steps should last even longer, normally between 50 and 75 years, as they don’t have to stand up to the elements.

Resurfaced concrete can last anywhere from eight to 15 years on average. Just how long your resurface concrete driveway lasts depends on how often you seal the concrete, the amount of traffic, how well the concrete resurfacer was applied, and even the soil quality. Poor soil that led to premature cracks in your existing concrete can quickly lead to even more cracks and problems if you don’t fix the root cause of the cracked concrete.

Penetrating sealer seeps into concrete pores to protect it from moisture and staining, cracking, and mold caused by water. This means you cannot remove penetrating sealers like topical sealers. The good news is that penetrating sealant doesn’t have to be removed before resealing, as most topical sealers must. Instead, you’ll want to buy a compatible penetrating sealant (often the same kind already in the concrete) and apply it. Always follow the manufacturer’s instructions.