Glossary of Terms
Built-up RoofA low-slope or flat roof covered with alternating layers of roofing felt and hot-mopped asphalt and topped off with a layer of gravel.
CorniceThe wood or metal finishing at ends or edges of building, including a fascia, frieze, or rake
Counter FlashingThe flashing that is embedded, or attached, and sealed at its top in a wall or other vertical structure and is lapped down over base flashing. Courses Horizontal rows of shingles or tiles
Drip EdgeThe strip of metal extending out beyond the eaves or rakes to prevent rainwater from curling around the shingles back into the wooden portion of the house.
EavesThe lower edge of a roof (often overhanging beyond the edge of the house).
Eave, Ice, and Snow GuardA 3-foot wide rubber membrane adhered to the sheathing at the roof's edge that attempts to stop migrating water from entering your home during severe ice dams.
EPDMA synthetic rubber membrane (ethylene propylene diene monomer), used on low-slope and flat roofs.
FeltThe bituminous paper used by roofers, usually made of a combination of asphalt and either paper or rags.
FasciaA decorative board extending down from the roof edge either at the eave or at the rake.
FlashingSheet metal or other material used at various planes on a roof to prevent water leakage.
Frieze BoardA board at the top of the house's finished wall, forming a corner with the soffit.
Laced ValleyA laced valley, or woven valley, is a continuous run of shingles where two sloping roofs meet.
RafterStructural wood, usually slanted, to which sheathing is attached.
RakeThe slanting edge of a gable roof at the end wall of the house.
RidgeThe horizontal line at the top edge of two sloping roof planes.
SheathingBoards or sheet material that are nailed to the rafters to which shingles or other outside roofing materials are secured.
Shingle FlashingFlashing that is laid in strips under each shingle and bent up at the edge of a chimney or wall.
Pitch (slope)The number of inches of vertical rise in a roof per 12-inches of horizontal distance.
SoffitThe area that encloses the underside of that portion of the roof that extends out beyond the sidewalls of the house.
SquareOne hundred square feet of roof or the amount of roofing material needed to cover 100 square feet when properly applied.
UnderlaymentThe material (usually roofing felt) laid on top of sheathing before shingles are applied.
ValleyWhere two sloping roof sections come together. Shingles in the valley are cut in a V direction exposing the valley flashing fabric.
Valley FlashingThe metal or fabric in valleys, extending in under the shingles on both sides.