Residential Construction Quality for Attics: Ceiling Insulation, Air Barriers, Draft Stops

1
Residential Construction Quality for
AtticsCeiling Insulation, Air Barriers, Draft
Stops Kneewalls

• Bruce Wilcox, BSG
• Rick Chitwood, CEM
• Marc Hoeschele, DEG

2
Changes for Attics in Performance Method
Calculations

• Add a heat loss path to represent typical heat
  flows related to air barriers and draft stops
• Modify the effective U-factor for knee walls and
  skylight shafts using same approach proposed for
  walls
• Provide a budget neutral credit for those
  builders using quality systems

3
Ceiling Defect Data
4
Compliance treatment for Ceilings

• Additional ceiling heat flow for typical
  installation
• in Standard Design
• compliance neutral
• No additional heat flow with verified
  installation quality
• compliance credit

5
Compliance for Kneewalls and Skylight Shafts

• Based on actual area in proposed design
• Insulation degradation same as proposed for
  exterior walls
• compliance neutral for standard practice
• compliance credit for verified installation
  quality