An existing building or portion thereof shall not be altered such that the building becomes less safe than its existing condition.
The following sections of the International Fuel Gas Code shall constitute the fuel gas materials and methods requirements for Level 1 alterations.
- All of Chapter 3, entitled "General Regulations," except Sections 303.7 and 306.
- All of Chapter 4, entitled "Gas Piping Installations," except Sections 401.8 and 402.3.
2.1. Sections 401.8 and 402.3 shall apply when the work being performed increases the load on the system such that the existing pipe does not meet the size required by code. Existing systems that are modified shall not require resizing as long as the load on the system is not increased and the system length is not increased even if the altered system does not meet code minimums.
3. All of Chapter 5, entitled "Chimneys and Vents."
4. All of Chapter 6, entitled "Specific Appliances."
Where addition or replacement of roofing or replacement of equipment results in additional dead loads, structural components supporting such reroofing or equipment shall comply with the gravity load requirements of the International Building Code.
- Structural elements where the additional dead load from the roofing or equipment is not increased by more than 5 percent. The cumulative effect of the load increase since original construction shall be considered.
- Buildings constructed in accordance with the International Residential Code or the conventional construction methods of the International Building Code and where the additional dead load from the roofing or equipment is not increased by more than 5 percent. The cumulative effect of the load increase since original construction shall be considered.
- Addition of a second layer of roof covering weighing 3 pounds per square foot (0.1437 kN/m2) or less over an existing, single layer of roof covering.