Mich. Admin. Code R. 408.31098

Current through Vol. 24-18, October 15, 2024

Section R. 408.31098 - (C506.1) Envelope alterations

Rule 1098. Section 5.1.3 of the standard is amended to read as follows:

(5.1.3). Alterations to the building envelope shall comply with the requirements of section 5 for insulation, air leakage, and fenestration applicable to those specific portions of the building that are being altered.

Exceptions:

1. Installation of storm windows or glazing panels over existing glazing, provided the storm window or glazing panel contains a low-emissivity coating. However, a low-emissivity coating is not required where the existing glazing already has a low-emissivity coating. Installation may be either on the inside or outside of the existing glazing.

2. Replacement of glazing in existing sash and frame, provided the U-factor and SHGC will be equal to or lower than before the glass replacement.

3. Alterations to roof or ceiling, wall, or floor cavities that are insulated to full depth with insulation having a minimum nominal value of R-3.0/in.

4. Alterations to walls and floors, where the existing structure is without framing cavities and no new framing cavities are created.

5. Roof recovering.

6. Removal and replacement of a roof membrane where there is existing roof insulation integral to or below the roof deck.

7. Removal and replacement of a roof membrane where the insulation is installed entirely above the roof deck, a minimum of R-20 insulation shall be permitted where the placement of additional insulation greater than R-20 insulation would require either of the following:

a. Raising the height of parapets, weep systems, or through wall flashings where roof abuts adjoining walls or parapets.

b. Raising the height of mechanical or electrical equipment, mechanical curbs, roof hatches, skylight curbs, service equipment, piping, conduit, duct work, roof platforms, ladders, stairs, guard rails, expansion joints, roof davits, or door thresholds.

8. Replacement of existing fenestration, provided that the area of the replacement fenestration does not exceed 25% of the total fenestration area of an existing building and that the U-factor and SHGC, will be equal to or lower than before the fenestration replacement.

Mich. Admin. Code R. 408.31098

2017 MR 10, Eff. 9/20/2017