The most susceptible area on a roof to wind damage is the cap. Cap shingles are used to cover the hip and ridge areas of two adjoining decks. Most installers simply use a 20-years 3-tab shingle, cut into pieces and placed in this area to act as cap and save money. Each manufacturer makes specially formulated cap shingles with aggressive adhesive to prevent blow-off. When it is time to replace the roof ask your contractor to use special Hip & Ridge Cap shingles made to withstand high winds, keep the shingle system guarantee and match the field shingles.