1. Station 4 ?? Temperatures and Moisture Moisture Meters Pin Contact Data Loggers Spot Temperature Meter Thermal Imager Cautions and Safety

2. Measure Moisture

4. Pin-Type makes pin holes extension pins available Contact Type non-destructive reads ~ 3” through materials settings for different materials

7. Preventing Mold Growth Control the Moisture Keep relative humidity in 30–50% range Keep surfaces warm No leaks inside No leaks from the outside Block entry of moist air Control wicking

8. Control Interior Moisture Contain moisture at the source Remove moisture with exhaust fans Ventilate: Exchange damp indoor air with dryer outside air De-humidification may be necessary

9. Relative Humidity Saturation of the air … at a given temperature Water holding capacity (%) of the air 50% RH means the air is 1/2 full 90% RH means the air can only hold 10% more water vapor (90% full)

10. FACT: Warm air can hold more moisture than Cold air Relative Humidity Temperature

11. Raise the temperature... Relative Humidity Decreases Temperature Relative Humidity

12. Relative Humidity Temperature

13. Cool closet = higher relative humidity

14. Dew Point: Temperature at which air becomes completely saturated (100% RH)

15. “Wet Air” “Dry Air” Different Relative Humidity of the “Air Film”

16. Mold and Moisture Materials only need to be at 85% to 90% relative humidity to support mold growth

17. Mirror reached dew point in Spokane on a hot summer day

18. Mirror temperature changed little, but moisture in the air changed (high RH%)

19. Preventing Mold Growth Control the Moisture Keep relative humidity in the 30 to 50% range Keep surfaces warm

20. Important to understand condensation Dew Point Calculator dpcalc.org http://www.dpcalc.org/

21. 30% Surfaces at ?? 0 F will be damp ??

22. 30% Surfaces at 37 0 F will be damp

23. 30% Surfaces at ?? 0 F will be damp ??

24. 30% Surfaces at 46 0 F will be damp

25. 45% Surfaces at ?? 0 F will be damp ??

26. 45% Surfaces at 50 0 F will be damp

27. ?? Surfaces at ?? 0 F will be damp

28. Surfaces at 55 0 F will be damp

29. ??

30. Surfaces at 60 0 F will be damp

31. Relative Humidity Monitor

32. Cordless Temperature and Relative Humidity Logger

33. 33

34. Moisture Generation Rate Moisture Generation Rate Moisture Removal Rate Moisture Removal Rate Aim for 30% to 50 % RH

35. Moisture Dynamics Relative Humidity: – Saturation of the air at a given temperature... – % of its water holding capacity 50% RH = the air is 1/2 full 90% RH = the air can only hold 10% more water vapor

36. RELATIVE HUMIDITY FACT: Warm Air Can Hold More Moisture Than Cold Air Temperature Relative Humidity

37. RELATIVE HUMIDITY Raise the air temperature and lower the relative humidity TEMP. R.H.

38. RELATIVE HUMIDITY Lower the air temperature increases the relative humidity TEMP. R.H.

39. Moisture Dynamics Dew Point: Temperature at which air becomes completely saturated = 100% Relative Humidity 100% full at this temperature

40. Areas of High RH COLD OUTSIDE Buildings have Micro-climates a/c duct, cold pipes, etc.

41. Dry Bulb = 72 0 F Wet Bulb = 60 0 F Relative Humidity = 50 % Dew Point Temp = 52 0 F

42. 100 % R H ??? 40 0 F 70 0 F 100 % RH

43. 35 % R H 40 0 F70 0 F 100 % RH Outdoors Indoors

44. Areas of High RH COLD OUTSIDE Buildings have Micro-climates a/c duct, cold pipes, etc.

45. Moisture + Asbestos = Double Trouble

46. single pane glass indicates high moisture levels single pane glass indicates high moisture levels

48. Leaks Repair Plants Breathing Cleaning Dishes, etc. Ventilation Shower Cooking Laundry Exhaust Fans

49. Ventilation (AC/h) VS Indoor Relative Humidity (%) Ventilation: Air Chances per Hour (AC/h) Indoor Relative Humidity (%) 1,500 ft sq house 70 0 F indoor temp 85 % outdoor RH 30 0 F outside temp typical moisture load.35 AC/h based on G. Tsongas

50. Ventilation (AC/h) VS Indoor Relative Humidity (%) Ventilation: Air Chances per Hour (AC/h) Indoor Relative Humidity (%) 1,500 ft sq house 70 0 F indoor temp 85 % outdoor RH 50 0 F outside temp typical moisture load.35 AC/h based on G. Tsongas

51. Ventilation (AC/h) VS Indoor Relative Humidity (%) Ventilation: Air Chances per Hour (AC/h) Indoor Relative Humidity (%) 1,500 ft sq house 70 0 F indoor temp 85 % outdoor RH 30 0 F outside temp typical moisture load 2 X moisture load 50 0 F outside temp typical moisture load 2 X moisture load.35 AC/h based on G. Tsongas

52. Good News for energy & comfort When it’s cold outside: do not need as much air exchange When it’s mild outside: need more exchange Drying Potential of Outside Air: The colder the outside air, the more drying effect when this air is warmed inside Warm, humid air has much less drying potential (can cause problems)

54. “Hot” household iron with half painted black ? which side is the black side? + 215 o F + 96 o F

55. 2 pennies placed on hot household iron Note the temperature reading of the penny painted flat black.. + 215.6 o F note the temperature reading of the shiny iron surface

56. Same Thermograph… Note the temperature of the shiny penny … do you really believe + 86.6 o F ?? Want to pick it up to find out? Also note the temperature reading of the shiny iron surface

57. $7,500 BBQ Gas Gauge