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On average, 6 inches of concrete can hold around 150 pounds per square foot, but the exact weight that 6 inches of concrete can hold depends on factors such as the type of concrete, the reinforcement method, soil conditions below, and structural design. If you’re concerned about the longevity of your concrete patio, walkway, or driveway, hire a professional to help you choose an appropriate concrete thickness and reinforcement method for your needs.

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.

Concrete houses cost 10% to 20% more to build than stick-built homes, and maintenance on home systems is more invasive and expensive due to pipes and wires being buried in concrete. Concrete homes can also look more industrial and less comfortable if you don’t cover the concrete with finishing materials. It’s also more challenging to make changes to concrete, so reframing doors and windows or building home additions will cost more. Concrete needs time to cure, too, so the timeline to build a house out of concrete is a bit longer.

Whether metal fence posts need concrete depends on the environment and the ground they're placed on. For thick earth and areas without significant weather or high wind, you can get by without concrete, but in areas with weak dirt and strong seasonal weather, it's a good idea to install a concrete base on each individual post. This increases the cost but not as much as replacing or reinstalling the fence would.