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here are some pro's and Con's
Pros: Concrete blocks are resistant against weather, pests, mold, and fire. Transporting concrete blocks can be quite expensive, but this material can be found locally in most cases. Concrete blocks are available in many sizes, finishes and colors. These units can also be manufactured to meet any set project requirements, and some concrete blocks are made using recycled materials. In addition, concrete blocks have good insulating properties against heat, sound and moisture.
Cons: Large concrete blocks are heavy and difficult to handle, requiring more manpower. Concrete blocks also increase the amount of steel required in reinforced cement concrete structures. The price of concrete blocks can vary depending on the region, cement costs and availability. Plumbing issues are harder to solve when they occur in a concrete masonry structure, since they can cause internal flooding. Concrete blocks must be cut open in this case, leading to material waste and expensive reparations. An effective drainage system is very important when dealing with concrete block masonry.