Joseph Lstiburek, Ph.D, P.Eng, ASHRAE Fellow Building Science Adventures In Building Science www.buildingscience.com Build Tight - Ventilate Right Joseph Lstiburek 2 Lstiburek buildingscience.com 1 of 39
Build Tight - Ventilate Right How Tight? What s Right? Joseph Lstiburek 3 Air Barrier Metrics Material 0.02 l/(s-m2) @ 75 Pa Assembly 0.20 l/(s-m2) @ 75 Pa Enclosure 2.00 l/(s-m2) @ 75 Pa 0.35 cfm/ft2 @ 50 Pa 0.25 cfm/ft2 @ 50 Pa 0.15 cfm/ft2 @ 50 Pa Joseph Lstiburek 4 Lstiburek buildingscience.com 2 of 39
Getting rid of big holes 3 ach@50 Getting rid of smaller holes 1.5 ach@50 Getting German 0.6 ach@50 Joseph Lstiburek 5 Best As Tight as Possible - with - Balanced Ventilation Energy Recovery Distribution and Mixing Source Control - Spot exhaust ventilation Filtration Material selection Joseph Lstiburek 6 Lstiburek buildingscience.com 3 of 39
Worst Leaky - with Nothing Spot Ventilation in Bathroom/Kitchen Exhaust Ventilation with No Distribution and No Mixing Joseph Lstiburek 7 Three Types of Controlled Ventilation Systems Exhaust Ventilation Supply Ventilation Balanced Ventilation Joseph Lstiburek 8 Lstiburek buildingscience.com 4 of 39
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Joseph Lstiburek 17 Ventilation Rates Are Based on Odor Control Joseph Lstiburek 18 Lstiburek buildingscience.com 9 of 39
Ventilation Rates Are Based on Odor Control Health Science Basis for Ventilation Rates is Extremely Limited Joseph Lstiburek 19 Ventilation Rates Are Based on Odor Control Health Science Basis for Ventilation Rates is Extremely Limited Almost Nothing Cited Applies to Housing Joseph Lstiburek 20 Lstiburek buildingscience.com 10 of 39
Ventilation Rates Are Based on Odor Control Health Science Basis for Ventilation Rates is Extremely Limited Almost Nothing Cited Applies to Housing The Applicable Studies Focus on Dampness Joseph Lstiburek 21 Joseph Lstiburek 22 Lstiburek buildingscience.com 11 of 39
Joseph Lstiburek 23 House 2,000 ft 2 3 bedrooms 8 ft. ceiling Volume: 16,000 ft 3.35 ach 93 cfm.30 ach 80 cfm.25 ach 67 cfm.20 ach 53 cfm.15 ach 40 cfm Joseph Lstiburek 24 Lstiburek buildingscience.com 12 of 39
House 2,000 ft 2 3 bedrooms 8 ft. ceiling Volume: 16,000 ft 3.35 ach 93 cfm.30 ach 80 cfm.25 ach 67 cfm.20 ach 53 cfm.15 ach 40 cfm Ventilation Rates 62-73 5 cfm/person 20 cfm 10 cfm/person 40 cfm 62-89 15 cfm/person 60 cfm.35 ach 90 cfm 62.2-2010 7.5 cfm/person 50 cfm + 0.01 62.2-2013 7.5 cfm/person 90 cfm + 0.03 Joseph Lstiburek 25 Office Occupant Density 15/1000 ft 2 (67 ft 2 /person) 62-89 15 cfm/person 5/1000 ft 2 (200 ft 2 /person) 62.1-2007 17 cfm/person Correctional Facility Cell Occupant Density 20/1000 ft 2 (48 ft 2 /person) 62.1 2007 10 cfm/person Lstiburek buildingscience.com 13 of 39
C.P. Yaglou Harvard School of Public Health 1936 1955 150 ft 3 20 cfm/person 300 ft 3 12 cfm/person C.P. Yaglou Harvard School of Public Health 1936 1955 150 ft 3 20 cfm/person 18.75 ft 2 106 occupants 300 ft 3 12 cfm/person 37.5 ft 2 53 occupants Experiment 470 ft 3 59 ft 2 200 ft 3 25 ft 2 100 ft 3 12 ft 2 Lstiburek buildingscience.com 14 of 39
Joseph Lstiburek 29 Aubin, D., Won, D.Y., Schleibinger, H., 2010 Joseph Lstiburek 30 Lstiburek buildingscience.com 15 of 39
Joseph Lstiburek 31 ASHRAE Standard 62.2 calls for 7.5 cfm per person plus 0.03 cfm per square foot of conditioned area Occupancy is deemed to be the number of bedrooms plus one Joseph Lstiburek 32 Lstiburek buildingscience.com 16 of 39
ASHRAE Standard 62.2 calls for 7.5 cfm per person plus 0.03 cfm per square foot of conditioned area Occupancy is deemed to be the number of bedrooms plus one Outcome is often bad part load humidity problems, dryness problems, energy problems Joseph Lstiburek 33 IRC 2015 and 2018 calls for 7.5 cfm per person plus 0.01 cfm per square foot of conditioned area Occupancy is deemed to be the number of bedrooms plus one Joseph Lstiburek 34 Lstiburek buildingscience.com 17 of 39
3 Bedroom House 2,500 ft2 30 cfm plus 75 cfm 105 cfm Joseph Lstiburek 35 3 Bedroom House 2,500 ft2 30 cfm plus 25 cfm 55 cfm Joseph Lstiburek 36 Lstiburek buildingscience.com 18 of 39
The Cult of The Blower Door Joseph Lstiburek 37 Joseph Lstiburek 38 Lstiburek buildingscience.com 19 of 39
Blower Door Can t Get You The True ACH On A Short Term Basis Hour, Day, Week Joseph Lstiburek 39 Don t Know Where The Holes Are Don t Know The Type of Holes Don t Know The Pressure Across The Holes Joseph Lstiburek 40 Lstiburek buildingscience.com 20 of 39
Dilution Is Not The Solution To Indoor Pollution Source Control Joseph Lstiburek 41 Dilution For People Source Control For The Building Joseph Lstiburek 42 Lstiburek buildingscience.com 21 of 39
Joseph Lstiburek 43 Recommended Range of Relative Humidity Above 25 percent during winter Below 70 percent during summer Lstiburek buildingscience.com 22 of 39
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Kitchen Exhaust Hoods Joseph Lstiburek 47 Joseph Lstiburek 48 Lstiburek buildingscience.com 24 of 39
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Clothes Dryers Joseph Lstiburek 57 Joseph Lstiburek 58 Lstiburek buildingscience.com 29 of 39
Joseph Lstiburek 59 Fireplaces Joseph Lstiburek 60 Lstiburek buildingscience.com 30 of 39
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Joseph Lstiburek 63 Approaches Joseph Lstiburek 64 Lstiburek buildingscience.com 32 of 39
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