Q My family room is attached to the house and has a two-slope gabled roof. Moss grows on one side, so much that it becomes thick and water-logged. Water backs up under the shingles and causes stains ...

The roof of a modern home with a dark gray metal roof and skylights - Jin Odin/Shutterstock A roof is one of those things you don't think too much about until it needs replacing, but you shouldn't ...