Roof History
This roofing material used by the Greek and Romans is among the oldest roofing materials and is still used today.
Clay Tiles
GAF has always been recognized for being a top performance manufacturer in residential and commercial roofing projects. This is what the GAF acronym stands for.
General Aniline & Film
OSHA considers this roof pitch steep and requires fall protection for workers.
4:12
A unit or measurement for 100 square feet of roof area.
Square
This type of roofing material covers roughly 75% of American homes.
Asphalt Shingles
This type of roofing material was invented in 1903.
Ashpalt Shingles
This is the class of an HDZ shingle.
Class 3
This is a measurement OSHA requires a ladder to extend above a roofline.
3'
This term is used to describe the rise over run or steepness of a roof.
Pitch
This is the highest part of a roof.
Ridge
The first R-Panel metal roof was installed in this country.
England
There are this many nails per shingle in a system plus application.
6
This is the points of contact (hands and feet) OSHA requires a worker to have on a ladder at all times.
3
This is the standard length of downspout for a 2-story home.
25'
This wood is mounted at the point where the roof meets the outer walls of the house and is often called the roofline.
Fascia
This roof in Washington is the largest roof in the world, covering 98.3 acres.
Boeing Everett Factory
This is attic ventilation that goes across the ridge of a roof.
Cobra Rigid Vent 3
OSHA requires a ladder to be placed at a 75 degree angle for maximum stability and safety. The rule to ensure the correct ratio of angle to height is this.
4-to-1 rule
This is the standard length of wall flashing and drip edge.
10'
Roofing nails are manufactured of this material.
Galvanized steel
In medieval Europe a steeply pitched roof was a sign of this.
Wealth (The higher the roof - the higher your social standing)
This is the wind rating of the HDZ shingle installed with 6 nails with the system plus warranty.
209 MPH
OSHA requires this size of clear path landing at the top of your ladder while stepping onto a roof.
30"x30"
Roofing materials are measured in squares. Hip and ridge shingles are measured by this.
Linear Feet
Weather barrier that sits on top of roof decking.
Feltbuster