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【正文】 Results from The Healthy Homes, Healthy Lives Phase 1 Study 2020 – 2020 ACI Home Performance April 9, 2020 Melissa MalkinWeber Can A Construction Protocol Impact Allergen Triggers? Study Partners ?HUD Office of Healthy Homes and Lead Hazard Control ?Advanced Energy ?National Institutes of Environmental Health Sciences (NIH) ?UNC School of Medicine Center for Environmental Medicine, Asthma, and Lung Biology ?Habitat for Humanity Presentation Overview ?Origin of the study ?What kind of houses and what did we do to them? ?Relative Humidity ?Allergens ?Ventilation ?Where do we look from here? High Performance Homes ?1,500+ SystemVision homes in North Carolina: ?Primarily affordable housing ?40% savings on heating and cooling pared to codebuilt Can the construction standard deliver “healthy”? ? Program houses have promising features Moisture Management Combustion safety Planned ventilation ? Dilution using outdoor air ? Exhaust ? Can they overe the homeowner? Exhaust fan use (or not) Furniture emissions Consumer products Methods study design ? 36 homes in central NC ? 4 Habitat Affiliates ? Similar in size and socioeconomic status of homeowner ? ~ 1200 SF per house, 23 beds, 2 baths Features of the intervention ?Tight construction ?Interior moisture management ?Improved insulation ?“Rightsized” HVAC ?Pressure balancing ?Fresh air ventilation ?Closed crawl space The Crawl Space Intervention Details found at Liner sealed to piers and wall, 3” termite view strip Supply air provides drying ?Outdoor air intake HVAC tonnage HVACtonnage0 . 0 00 . 2 50 . 5 00 . 7 51 . 0 01000 1100 1200 1300 1400 1500T o t a l Co n d i t i o n e d A r e a1 . 522 . 5Intervention green, nonintervention red HVAC tonnage TONS TONS TONS Remote Temperature RH and Wood Moisture Sensors How the crawl spaces perform – RH 01020304050607080901001 /1 /0 4 3 /3 1 /0 4 6 /2 9 /0 4 9 /2 7 /0 4 1 2 /2 6 /0 4 3 /2 6 /0 5 6 /2 4 /0 5 9 /2 2 /0 5 1 2 /2 1 /0 5 3 /2 1 /0 6 6 /1 9 /0 6 9 /1 7 /0 6 1 2 /1 6 /0 6% Relative HumidityNo n inter v e nt ion Inter v e nt ionFixed crawl space installations Conclusions About RH Controlled Crawl ?Maintains RH below 70% the “mold suppressing” zone ?Demonstrates suppression of moisture load
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