Many inspectors, about 20 percent, found this to be the most common home defect. It includes such situations as insufficient electrical service to the house, aluminum wiring, inadequate overload protection, improper grounding, and dangerous amateur wiring connections. This is a serious safety hazard, not just a cosmetic defect. Older and damaged roofs. About 9 percent of inspectors cited this as the most-common problem.
Many wooden roofs are at the end of their useful life.
Asphalt shingle roofs only last about 15 to 20 years. Roof leakage caused by old or damaged shingles or improper flashing is a frequent problem. It can be easy and inexpensive to repair damaged tiles and shingles and to recaulk the roof penetrations. But, expensive, major roof repairs may be required down the road, if the repairs are put off. Deficient and older heating systems.