COST DRIVERS IN PHIUS AND ZERH HOME CONSTRUCTION...Donaldson Run Passive House PHIUS Certified 2015....
Transcript of COST DRIVERS IN PHIUS AND ZERH HOME CONSTRUCTION...Donaldson Run Passive House PHIUS Certified 2015....
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COST DRIVERS IN PHIUS AND
ZERH HOME CONSTRUCTION
Patty Shields, LEED APMetro Green, LLC
Falls ChurchResidential Builders
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Donaldson Run Passive House
PHIUS Certified 2015
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Other certs – LEED, ZERH, Energy Star, Earthcraft, Green Home Choice
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Keys to success• A good plan and a team that gets you there
• Motivated client with realistic expectations• Experience/motivated builder• 3rd Party Rater • Energy Star Certified HVAC Installer
• PHIUS, ZERH, Energy Star and IAQ Plus
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Cost drivers
• Material Costs• Labor
• Quality Control
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Cost Implications by PHASE
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Design and Spec development:
• Passive Solar Design inputs• Energy Modeling • Wall assembly, fenestration,
Mechanical plan• Assembling your team – Experience,
curiosity, motivated
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Help your builder with good details
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FoundationInsulation, Eliminate Thermal Bridges, Vapor barrier
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FramingReducing Thermal Bridges and High R• double wall, outsulation, SIPs
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VAPOR
RETARDER
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Windows:PH certified triple glaze windowsCost and Installation v double glaze
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Exterior WRB and AirsealingOutsulation v Zip-R v peel and stick continuous
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Testing:Smoke tests, real tests, and what they reveal: KEEP IT SIMPLE
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Insulation Approaches:• Flash foaming – Closed Cell• Open Cell at bands• Dense pack cellulose, rockwool• Quality CONTROL
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Mechanicals:
• Heat Pumps with VRF – Variable Refrigerant Flow • Mini-Splits• Whole home
• Ventilation Strategies – ERV • Dehumidification
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Mechanical Install:• Who is your installer?• Energy Star certified? Motivated?• Sealing the ducts – QUALITY
CONTROL• Mastic, Flash foaming for
condensation• Testing – Duct Blaster
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Final Testing and Commissioning:
• Duct Blaster• Blower Door• Balancing• Documenting Lessons Learned
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Lessons Learned:
• Understand your client’s real goals:• Reduced carbon footprint
• Embodied energy- tear down
• IAQ• Energy independence
• Solar needs to be in the mix
• Thought leader – exemplar
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What Cost Balancing do we grapple with most:
• Solar PV v PH certified windows• Venting dehumidification v ERV + dehu• Outsulation v ZipR v closed cell flash