Building Science. Adventures In Building Science. Build Tight - Ventilate Right

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1 Build Tight - Ventilate Right Joseph Lstiburek, Ph.D., P.Eng, ASHRAE Fellow Building Science Adventures In Building Science Joseph Lstiburek 2 Air Barrier Metrics Build Tight - Ventilate Right How Tight? What s Right? Material Pa Assembly Pa Enclosure Pa Pa Pa Pa Joseph Lstiburek 3 Joseph Lstiburek 4 Lstiburek buildingscience.com 1 of 15

2 Getting rid of big holes 3 ach@50 Best Getting rid of smaller holes 1.5 ach@50 Getting German 0.6 ach@50 As Tight as Possible - with - Balanced Ventilation Energy Recovery Distribution Source Control - Spot exhaust ventilation Filtration Material selection Joseph Lstiburek 5 Joseph Lstiburek 6 Worst Leaky - with Nothing Spot Ventilation in Bathroom/Kitchen Exhaust Ventilation with No Distribution Joseph Lstiburek 7 Joseph Lstiburek 8 Lstiburek buildingscience.com 2 of 15

3 Joseph Lstiburek 9 Joseph Lstiburek 10 Joseph Lstiburek 11 Joseph Lstiburek 12 Lstiburek buildingscience.com 3 of 15

4 Cost Exhaust $150 Exhaust + Dist $200 Supply + Dist $200 Spot + Ex/Sup + Dist $500 Balanced/HRV $1,250 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 13 Joseph Lstiburek 14 The Cult of The Blower Door Joseph Lstiburek 15 Joseph Lstiburek 16 Lstiburek buildingscience.com 4 of 15

5 Joseph Lstiburek 17 Joseph Lstiburek 18 Blower Door Can t Get You The True ACH On A Short Term Basis Hour, Day, Week Don t Know Where The Holes Are Don t Know The Type of Holes Don t Know The Pressure Across The Holes Joseph Lstiburek 19 Joseph Lstiburek 20 Lstiburek buildingscience.com 5 of 15

6 Good For Long Term Average If No Big Pressures Good For Average Annual Energy Prediction Good For Long Term Average If No Big Pressures Good For Average Annual Energy Prediction Not Good For IAQ Unless You Accept Average Annual Exposure As A Metric Joseph Lstiburek 1 Joseph Lstiburek 2 Cost of Addressing the Problems Are Less Than The Cost of Testing To See If You Have Problems Combustion Safety Indoor Contaminants Comfort Energy Joseph Lstiburek 3 Joseph Lstiburek 4 Lstiburek buildingscience.com 6 of 15

7 Bring Combustion Appliances Up To Code Code Compliant Combustion Air Control Pressures Install Controlled Ventilation Get Rid of Big Holes Insulate Joseph Lstiburek 5 Joseph Lstiburek 6 Joseph Lstiburek 7 Joseph Lstiburek 8 Lstiburek buildingscience.com 7 of 15

8 Joseph Lstiburek 9 Joseph Lstiburek 10 Joseph Lstiburek 11 Joseph Lstiburek 12 Lstiburek buildingscience.com 8 of 15

9 Joseph Lstiburek 13 Joseph Lstiburek 14 Joseph Lstiburek 15 Joseph Lstiburek 16 Lstiburek buildingscience.com 9 of 15

10 Sealed Combustion Appliances Joseph Lstiburek 17 Joseph Lstiburek 18 Joseph Lstiburek 19 Joseph Lstiburek 20 Lstiburek buildingscience.com 10 of 15

11 Joseph Lstiburek 21 Joseph Lstiburek 22 Lstiburek buildingscience.com 11 of 15

12 Control Pressures Joseph Lstiburek 1 Joseph Lstiburek 2 Joseph Lstiburek 3 Joseph Lstiburek 4 Lstiburek buildingscience.com 12 of 15

13 Joseph Lstiburek 5 Joseph Lstiburek 6 Joseph Lstiburek 7 Joseph Lstiburek 8 Lstiburek buildingscience.com 13 of 15

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