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Cleaning basics lake geneva

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This PowerPoint was presented by Jason Church on May 18, 2012 as part of a Cemetery Preservation Basics workshop in Lake Geneva, WI for the Wisconsin Historical Society.

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Cleaning basics lake geneva

  1. 1. C emetery Monument C are 1
  2. 2. Materials Issues• If possible, id entify the m aterial or m aterials to be cleaned• Evaluate the cond ition of the surface prior to cleaning. Is it powd ery or sugaring?• Will cleaning rem ove original m aterial? 2
  3. 3. Marble 3
  4. 4. Marble 4
  5. 5. L imestone 5
  6. 6. L imestone 6
  7. 7. G ranite 7
  8. 8. G ranite 8
  9. 9. Sandstone 9
  10. 10. Sandstone 10
  11. 11. C oncrete 11
  12. 12. C oncrete 12
  13. 13. C leaning Issues • What is the reason for cleaning the m onum ent? – Soiling – Staining – Particulate M atter/Gypsum crusts – Biological growth – Vand alism /graffiti 13
  14. 14. Why Should We C lean?• Read ability 14
  15. 15. Soiling 15
  16. 16. Staining 16
  17. 17. Deterioration/G ypsum C rusts Sugaring 17
  18. 18. Deterioration/G ypsum C rusts 18
  19. 19. Biological Growth 19
  20. 20. Vandalism 20
  21. 21. C leaning Issues • What are som e consid erations regard ing cleaning m ethod s? – Acceleration of d eterioration – L oss of original m aterials – L ong-term stability of m onum ent – L ong-term affects of cleaners 21
  22. 22. Types of C leaning• M echanical• C hem ical• C om bination• O ther 22
  23. 23. C hemical C leaning• Prod ucts includ ing – Acceptable • D etergents • Surfactants • Solvents • Biocid es • Interm ittent water m isting – U nacceptable • Salt-based cleaners 23
  24. 24. Mechanical C leaning• Acceptable – L ow pressure, power-washing (less than 300 psi) – M echanical agitation using soft bristle brushes• U nacceptable – Sand blasting – H igh-pressure power-washing (greater than 300 psi) – Grind ers – Wire brushes 24
  25. 25. Do’ s and Donts of C leaning• D on’t rem ove original surfaces• D on’t use bleach or other salt lad en cleaners• D on’t power-wash with high pressures• D on’t sand blast or use harsh m echanical m ethod s such as power tools• D on’t use strong acid s or bases 25
  26. 26. Do’ s and Donts of C leaning• Never Use A Wire Brush or Power Equipment 26
  27. 27. Do’ s and Donts of C leaning• High Pressure Washing 27
  28. 28. Do’ s and Donts of C leaning• Don’t Harsh Cleaners Such As Acids and Strong Bleaches = Old Anacoc Baptist Church Cemetery, Leesville 28
  29. 29. Do’ s and Donts of C leaning• D o N o H arm• D o select the gentlest cleaning m ethod to accom plish the task• D o perform sm all tests before cleaning the entire stone• D o follow m anufacturers’ recom m end ations• D o follow m anufacturers’ safety guid ance• D o exercise patience. 29
  30. 30. Handling and Safety 30
  31. 31. E quipment 31
  32. 32. C hoice of C leaners• C onsid er gentlest m ethod available• For basic cleaning, consid er – – A non-ionic d etergent – A neutral pH or – A pH sim ilar to the stone – A prod uct containing a biocid e 32
  33. 33. Do make small tests 33
  34. 34. Basic C leaning• Follow m anufacturer’s instructions• A L WA YS use soft bristle brushes• NE VE R use a wire brush• NE VE R use power tools, such as power washers, grind ers, or sand ers 34
  35. 35. A pplication of C leaners• A L WA YS Soak the Stone Before C leaning• Start C leaning From the Bottom and Work Up• U se a Sm all C ircular M otion• U se L ots of Water 35
  36. 36. Where to Get More Information• www.ncptt.nps.gov• O r contact: Jason C hurch N C PTT 645 U niversity Parkway N atchitoches, L A 71 457 31 8/356-7444 jason_church@ contractor.nps.gov 36

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