Roof Angle Requirements

Section r905 regulates many different types of roof covering material.

Roof angle requirements.

Roof pitch designations are comprised of two numbers indicating a ratio. That works out to about nine degrees if that works better for you. Minimum roof pitch for a covered porch. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

1910 23 d 4 ii the top of the parapet if the parapet is continuous. However not just any pitch above zero is. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. And because of their interlocking or active fastening systems metal roof panels are designed to meet the requirements of astm e1592 ul 580 ul1897 and other severe wind and uplift tests.

Adding a covered porch adds exterior space to a house and providing a. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. The minimum requirement is 2 12. What is the minimum pitch slope of an asphalt shingle roof.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america. 1910 23 d 5 for through ladders the steps or rungs are omitted from the extensions and the side rails are flared to provide not less than 24 inches 61cm and not more than 30 inches 76 cm of. Water will flow as long as the drainage angle is greater than zero.

Pitch is the term used to describe the angle slope or slant of your roof. Either way the notation designates a ratio. As far as the actual roof covering asphalt shingles rated up to 130 mph wind uplift and metal roofing such as 26 gauge g 90 steel or better 24 and 22 gauge steel are thicker sturdier and hence better for the. Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.

Angle the angle of a roof is the same as the roof s slope except instead of being. Here is a list of the roofing materials regulated by the code. Roof pitch calculator results explained. A roof protects a house and porch from snow and rain as well as the heat of the sun.

Metal roofing products come in a variety of materials as well as many colors textures and profiles. The roof if the parapet is cut to permit passage through the parapet. Requirements for roof coverings section r905 now lets get into the minimum roof slope requirements based on the different types of roof covering material. Shingles of all types need to have a slope to function properly.

The requirements for an asphalt shingles roof are contained in the international building code.