Alterations and Repairs to Existing Buildings

1. Make additions, alterations, renovations, and repairs to existing buildings comply with the new energy efficiency requirements. Existing buildings and systems need not be updated to comply with new the energy effi ciency requirements. Example: a screened porch is enclosed and made into conditioned space. The porch must comply with the new energy efficiency requirements but the rest of the building need not comply.
2. Make unconditioned space that is altered to become conditioned space comply with the energy efficiency requirements. Example: an att ached garage is converted into conditioned space. The garage must comply with the new energy effi ciency requirements but the rest of the building need not comply.
3. You need not make the following alterations and repairs comply with the new energy efficiency requirements if the home’s energy use does not increase:                                      (a) installing storm windows over existing windows, and                                                                                                                                                                                                                                                (b) replacing only glass in an existing window or door (existing sash frame remains), and                                                                                                                                                                                (c) upgrading insulation in ceiling, wall or fl oor cavities exposed during construction if insulation is replaced in the cavities before cover-up, and                                                          (d) adding insulation when the existing roof, wall, or fl oor cavities are not exposed during construction, and                                                                                                                                      (e) adding insulation during reroofing when the sheathing or existing insulation is not exposed, and                                                                                                                                                            (f) adding a vestibule or revolving door when replacing an existing door that separates conditioned from unconditioned space, and                                                                                        (g) replacing fewer than (<) 50% of the light fi xtures in a space if the replacement fixtures do not increase the current energy use, and (h) replacing only bulbs and ballast in existing light fixtures in a space if the replacement bulbs and ballasts do not increase the current energy use.
4. Insulate uninsulated roof assemblies during reroofing if the roof sheathing is exposed during the reroofing. The insulation may be applied either above or below the roof sheathing. This provision applies to assemblies such as cathedral ceilings and similar assemblies where the interior finish is applied directly to the rafters. Proper insulation installation is diffi cult in these assemblies. Refer to Chapter 8 for more information.
5. Do not make additions, alterations, renovations, or repairs that cause the existing building or systems to become unsafe or the overload existing systems. Example: do not convert an area from unconditioned to conditioned space using the existing HVAC system without calculating the increased load on the existing HVAC system and making any necessary changes to the existing HVAC system.
6. Comply with the U-factor and SHGC values in the Table N1102.1 when replacing fenestration in an existing building with new fenestration, including new frames, sash, and glazing. This requirement does not apply when replacing only glazing.