Residential Roof Terminology

That part of a roofing waterproofing or flashing component that overlaps or covers any portion of the same or.

Residential roof terminology.

Occurs where overlapping materials are seamed sealed or. The surface usually plywood or oriented strand board osb to which roofing materials are applied. It is the number of inches a roof rises vertically for every 12 inches of travel horizontally. A roof s slope is the number of inches it rises for every 12 inches of horizontal run a roof with a 4 in 12 slope rises 4 inches for every 12 inches of horizontal run.

The terms pitch and slope are simply two different ways of expressing the same measurement. A line made on the roof by snapping a taut string or cord dusted with chalk. An area of a roof with a valley on one side and a rake on the other and both come together at a point. Used for alignment purposes.

An l shaped strip usually metal installed along roof. The higher the number the steeper the roof. Pitch this is the slope of the roof. An asphalt based roof cement formulated to adhere overlapping plies or asphalt roll roofing.

Indicates roofing is able to withstand severe exposure to fire originating from sources outside the building. The highest fire resistance rating for roofing as per astm e 108 or ulc s107. A roof is typically referred to for example as a 4 12 or 4 pitch. The same roof has a 4 12 or 1 3 pitch.

Ice dams occur when melted snow refreezes near the overhang of a roof blocking the path for water run off and building up a heavy wall of ice. What is an ice dam. Square hip roofs look like pyramids but hip roofs are also found on rectangular homes.