Roof Angle Requirements

Asphalt shingles continue to be the most widely installed roof covering option in north america.

Roof angle requirements. Whether you go with roof trusses or rafters local building code requirements with respect to roof bracing should be considered. Shingles of all types need to have a slope to function properly. Or the colon can replace the slash as in 2 12 or 7 12. The requirements for an asphalt shingles roof are contained in the international building code.

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. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The roof if the parapet is cut to permit passage through the parapet. That works out to about nine degrees if that works better for you.

Adding a covered porch adds exterior space to a house and providing a. Requirements for roof coverings section r905 now lets get into the minimum roof slope requirements based on the different types of roof covering material. 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. 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.

The minimum requirement is 2 12. Roof pitch designations are comprised of two numbers indicating a ratio. Roof pitch calculator results explained. Water will flow as long as the drainage angle is greater than zero.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Angle the angle of a roof is the same as the roof s slope except instead of being. 1910 23 d 4 ii the top of the parapet if the parapet is continuous. 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. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

Section r905 regulates many different types of roof covering material. Pitch is the term used to describe the angle slope or slant of your roof. Minimum roof pitch for a covered porch. Here is a list of the roofing materials regulated by the code.

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.