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The Drying of Heritage Properties

The Drying of Heritage Properties. Nigel Hewitt Technical Manager. Communication. Establish good lines of communication Project Managers Insured All other relevant parties. Goals. What are trying to achieve What was pre loss condition Indoor Atmosphere 18 ºC - 22ºC

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The Drying of Heritage Properties

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  1. The Drying of Heritage Properties Nigel Hewitt Technical Manager

  2. Communication • Establish good lines of communication • Project Managers • Insured • All other relevant parties

  3. Goals • What are trying to achieve • What was pre loss condition • Indoor Atmosphere • 18ºC - 22ºC • 40% - 60% Relative Humidity • Can we find a “Dry Standard” • How “Dry” was the property pre-incident

  4. Goals • Where is the moisture located • Moisture Meters • Moisture sensors • Penetrating • Non-penetrating • Thermal Hygrometers • Thermography • Boroscopes

  5. Goals • What’s Wet • What kind of materials • Structural or decorative • How Wet is it • Which is the most appropriate drying system • Open • Closed • Combination

  6. The Drying Process • Water is present in one of three forms • Surface Water • Very easy to dry • Free Water • Easy to dry • Bound Water • Harder to dry

  7. Humidity AIRFLOW TEMP What Effects The Drying

  8. Surface Free Water Bound Water Humidity Airflow Temperature

  9. Moisture Movement • Moisture movement occurs when there is a vapour pressure imbalance between materials and environments • Moisture movement ceases when there is vapour pressure equilibrium

  10. Permeance • Ability of moisture to pass through materials • Based on: • Vapour Pressure • Temperature • Relative Humidity • Pore size

  11. Considerations • Permeability of different materials • Connected materials with different rates of permeability • Vapour Barriers • Where are they located • Can they be perforated • Can they be removed • Hidden cavities

  12. Considerations • Secondary Damage • Moulds • Dry Rot • Wet Rot

  13. Drying Equipment • Airmovers • Essential part of drying process • Velocity, pressure and placement effect performance • Airmover Types • Carpet dryers • Inter-air dryers • Axial fans • High volume airmovers

  14. Dehumidifers • Types of dehumidifier • Domestic refrigerant • Commercial Refrigerant • LGR • Desiccants • Humididstats

  15. Alternatives • Heat drying systems • Is it safe • Low level back ground heat • Controlled Ventilation • Dry Slowly

  16. Considerations • Surface finishes • Limewash • Paints • Wood panelling • Fabric • Leather

  17. Areas of Concern

  18. Areas of Concern

  19. Target Drying • Ducting • Simple way to improve drying

  20. Target Drying

  21. Target Drying

  22. Target Drying

  23. Target Drying

  24. Target Drying • Drying Hardwood Floors • Apply positive air pressure one side • Negative pressure on the other • Greatly increases drying efficiency

  25. Target Drying

  26. Target Drying

  27. Target Drying

  28. Target Drying • Injection Drying • Dries voids and cavities • Use positive and negative pressure • Reduce claim duration • Equipment can be expensive

  29. Secondary Damage

  30. Secondary Damage

  31. Secondary Damage

  32. Contents

  33. Monitoring • Where is the moisture located • Moisture Meters • Moisture sensors • Penetrating • Non-penetrating • Thermal Hygrometers • Thermography • Data Loggers • Remote Monitoring • Calcium Carbide

  34. Data Loggers

  35. Data Loggers

  36. Remote Monitoring • Continual Monitoring • Temp • Rh • Specific Humidity • Dew Point • Set Thresholds • Alarms

  37. Calcium Carbide • Measures moisture content in materials • A weighed sample is added with calcium carbide into the pressure vessel • Chemical reaction produces acetylene gas • The increase in pressure can be read directly from a calibrated pressure gauge

  38. In Summary • Determine what’s wet and how wet it is • Check all unaffected items • Select appropriate drying system • Monitor frequently and accurately • Flood Prevention

  39. Thank You Any Questions

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