![]() Clay and Concrete Tile Minimum Roof Slope (Roof Pitch) | R905.3.2Ĭlay and concrete roof tiles can only be installed on roof slopes of 2-1/2:12 or greater. This means for every 12 horizontal units, the roof must rise a minimum of 2 vertical units.Īlso if Asphalt shingles are installed on a roof slope of 2:12 to 4:12, it shall be provided with a double underlayment application. Asphalt Shingles Minimum Roof Slope (Roof Pitch) | R905.2.2Īsphalt shingles can only be installed on roof slopes of 2:12 or greater. Now let us look at the minimum roof pitch (roof slope) required for each type of roofing material regulated in the IRC. Thermoset and Thermoplastic Single-ply Roofing.Here is a list of the roofing materials regulated by the code: Section R905 regulates many different types of roof covering material. Now lets get into the minimum roof slope requirements based on the different types of roof covering material. ![]() Requirements for Roof Coverings – (Section R905) You will see these examples as we go though explaining the topic of roof slopes as referenced in the code. When referring to roofs should we use the term “Pitch” or “Slope”?īoth these terms work interchangeably and can mean the same thing however since we are referencing the code related to roofs, the code uses the term “Slope”. ![]() Roof Pitch or Roof Slope ?įirst off lets get some terminology out of the way. The steeper the roof slope, the less potential for water to backup however the roofing materials established in Chapter 9 must meet to minimum slope requirements. Therefore each type of roofing material has a minimum slope requirement that must be maintained to decrease the potential of water intrusion. When the roof surface has less of a slope, water drainage tends to be slow so the potential of water intrusion increases since there is a greater potential for water to backup under the roofing material. Roof covering materials provide weather protection and Chapter 9 regulates the minimum required slope for each type of roof covering material since part of the performance of a roof covering material is based on the slope of the roof surface. There are many different types of roof covering materials used in residential construction. In this post we will look at the requirements in Chapter 9 of the International Residential Code (IRC), specifically Section R905 which regulates roof covering materials. To see what the difference is between the IRC and IBC, check out this POST explaining what buildings and structures are subject to the IRC verses the IBC. As for buildings subject to the International Building Code (IBC), the roof assembly requirements are found in Chapter 15. The design and construction of roof assemblies for residential structures are found in Chapter 9 of the International Residential Code (IRC). ![]()
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