replacement shingles or shakes shall be in compliance with the rating required by Table 1505.1. *IBC Sections 1511.7 and 1511.8; added to read as follows: 1511.7 Maintain existing provisions. When reroofing, or repairing existing roofing, the installer is required to insure the following items are maintained: Existing roof drains and drainage systems are maintained clear an unobstructed. When in the opinion of the Building Official the existing drainage system appears inadequate, the system shall be re-evaluated and when necessary required to comply with the provisions for new construction. Fire-retardant requirements are maintained. Construction of a sloped or flat roof over an existing roof in a 1510.8 Attic space. manner that creates an attic or a concealed space shall require the removal of any existing roofing material, composed of tar, asphalt or roof insulation, from the newly created attic space. CHAPTER 16 STRUCTURAL DESIGN – IBC SECTION 1611 RAIN LOADS *IBC Section 1611.1; changed to read as follows: 1611.1 Design rain Each portion of a roof shall be designed to sustain the load of rainwater that will accumulate on it if the primary drainage system for that portion is blocked plus the uniform load caused by water that rises above the inlet of the secondary drainage system at its design flow. The design rainfall shall be based six (6) inches per hour on the 100-year hourly rainfall rate indicated in Figure 1611.1 or on other rainfall rates determined from local weather data. approved IBC SECTION 1612 FLOOD LOADS *IBC Section 1612.1; changed to read as follows:
replacement shingles or shakes shall be in compliance with the rating required by Table 1505.1. *IBC Sections 1511.7 and 1511.8; added to read as follows: 1511.7 Maintain existing provisions. When reroofing, or repairing existing roofing, the installer is required to insure the following items are maintained: Existing roof drains and drainage systems are maintained clear an unobstructed. When in the opinion of the Building Official the existing drainage system appears inadequate, the system shall be re-evaluated and when necessary required to comply with the provisions for new construction. Fire-retardant requirements are maintained. 1510.8 Attic space. Construction of a sloped or flat roof over an existing roof in a manner that creates an attic or a concealed space shall require the removal of any existing roofing material, composed of tar, asphalt or roof insulation, from the newly created attic space. CHAPTER 16 – STRUCTURAL DESIGN IBC SECTION 1611 RAIN LOADS *IBC Section 1611.1; changed to read as follows: 1611.1 Design rain Each portion of a roof shall be designed to sustain the load of rainwater that will accumulate on it if the primary drainage system for that portion is blocked plus the uniform load caused by water that rises above the inlet of the secondary drainage system at its design flow. The design rainfall shall be based six (6) inches per hour on the 100-year hourly rainfall rate indicated in Figure 1611.1 or on other rainfall rates determined from approved local weather data. IBC SECTION 1612 FLOOD LOADS *IBC Section 1612.1; changed to read as follows:
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