Just like any other trade or profession, roofing has a language all its own. Here are some terms you'll want to be familiar with so that you and your contractor are speaking the same language.
1--Deck/sheathing. This is the base surface to which other roofing materials are applied.
2--Drip edge. An L-shaped strip installed along the edges of the roof. It keeps water from running back under your deck and eves.
3--Felt/underlayment. Also called tar paper. It is used as a secondary layer of protection on top of the deck and beneath roofing material.
4--Flashing. Pieces of metal used to prevent the seepage of water around any intersection or projection in a roof. These include chimneys, vents and valleys. Many roof leaks occur at flashing points.