Flood insurance offers the broadest way of protecting your home against flood damage. The typical flood insurance covers your HVAC systems, appliances, foundation damage, flooring, support structures, and plumbing. Usually, ten percent of the coverage can pay for the cost of rebuilding your detached garage. While flood insurance policies cover most of the rebuilding costs for both your home and garage, you should be aware of the policy exclusions. For instance, flood insurance doesn't cover erosion caused by flooding, lost income, vehicle damage, and damages to the sewer system.