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Energy Efficiency

Energy Efficiency. In the House Envelope. <Topics>. “Weather proofing” goals Insulation Air infiltration Systems for success Tests for success Blower door Infrared camera. <Topics>. Windows and doors. Indoor Climate and Energy Efficiency.

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Energy Efficiency

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  1. Energy Efficiency In the House Envelope

  2. <Topics> • “Weather proofing” goals • Insulation • Air infiltration • Systems for success • Tests for success • Blower door • Infrared camera

  3. <Topics> • Windows and doors

  4. Indoor Climate and Energy Efficiency Balance reduced energy use with good indoor environment Indoor air quality, comfort conditions (e.g. no drafts in winter) House construction must fit the appropriate climate zone! (We’re in Zone 4 mixed / Zone 5 cool)

  5. Insulation • Conduction barrier • Radiant barrier • Combination • Theoretical v. actual performance • Types • Installation and systems

  6. Consider a range of products for different applications • General—loose fill or blanket—best value • Air sealing and filling hard-to-reach spaces—spray foam or wet process cellulose • Combine processes, if needed, to get good coverage plus air sealing!

  7. Air Infiltration • Uncontrolled energy leakage • Uncontrolled moisture movement • Threat to individual comfort

  8. Air infiltration standards and targets • Air leakage per unit of floor area, at a rated pressure difference • ASHRAE • Energy Star Home

  9. Systems for success • Realistic expectations—HES, ZIP Insulation • Common sense (ex.: cantilevered floors) • Building codes • Energy efficiency industry programs

  10. Seal all penetrations into unconditioned spaces!

  11. Foundation Gasket

  12. Door Weather seals

  13. Consistent, reliable systems for managing penetrations in the drainage plane

  14. Windows and doors • Function and operability are controlling • Protect envelope integrity and function—weather exposure?

  15. Test your success • Infrared thermometers and cameras • Blower door and duct system tests

  16. Air Infiltration Take-Home Messages • There are good construction methods and bad methods—demand the good methods • There are systems to check on quality of finished product—plan your system and tell your builder • Commission the finished product—if it isn’t right, fix it

  17. For more information…. • Construction guidebooks (ex. JLC) • System checklists • http://resnet.us/standards/RESNET_IR_interim_guidelines.pdf

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