#1311 Enforcement of Mandatory Minimums

[Michael Shewmaker]

Enforcement of mandatory minimums:
Roof deck insulation - roof decks in newly constructed attic systems shall be insulates to achieve an area-weighted average U-factor not exceeding U-0.184.
(alter rule setting Cons:CodeUValueLabel to inform user of issue during input)

Ceilings and rafter roof insulation -

1. In additions and new construction, ceilings and rafter roofs shall be insulated to achieve an area-weighted average U-factor not exceeding U-0.043
2. In an alteration, ceilings and rafter roofs shall be insulated to achieve an area-weighted average U-factor not exceeding U-0.054

Wall insulation -

1. 2x4 wood framed walls - shall have an overall assembly U-factor not exceeding U-0.095.
2. 2x6 or greater wood framed walls - shall have an overall assembly U-factor not exceeding U-0.069.
3. Opaque nonframed assemblies - shall have an overall assembly U-factor not exceeding U-0.102.
4. Bay or Bow Window roofs and floors - shall be insulated to meet the wall insulation requirements of Table 150.1-A (prescriptive new construction)
5. Masonry/Mass walls - shall be insulated to meet the wall insulation requirements of Table 150.1-A (prescriptive new construction)

Raised floor insulation - shall have an overall assembly U-factor not exceeding U-0.037

Fenestration (including skylights) - shall have a maximum U-factor of 0.40

Duct insulation -

1. Ducts in conditioned space are not required to be insulated;
2. All other ducts shall have a minimum installed level of R-6.0

Duct system leakage - shall not exceed 5%

SC system airflow rate and fan efficacy

1. minimum 350 cfm/ton; maximum 0.45 W/cfm for gas furnace air-handling units
2. minimum 350 cfm/ton; maximum 0.58 W/cfm for air-handling units that are not gas furnaces
3. minimum 250 cfm/ton; maximum 0.62 W/cfm for small duct high velocity forced air systems