Restoration Cleaning:

Transcription

1 Restoration Cleaning: turning back the hands of time. PRO006 Presented by PROSOCO Inc. Phone: Fax:

2 PROSOCO is a Registered provider with the American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non- AIA members are available on request. This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing or dealing in any material or product. Questions related to specific materials, methods and services will be addressed at the conclusion of this presentation.

3 Copyrighted Materials This presentation is protected by US and International copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is prohibited. PROSOCO 2006 PROSOCO SINCE 1939

4 Learning objectives 1. List four reasons for masonry restoration cleaning 2. Name four levels of masonry contaminants 3. Name the three basic techniques for restoration cleaning

5 Learning objectives 4. Identify the four types of restoration cleaners, and explain an advantage and limitation of each 5. List three important considerations for interior restoration cleaning 6. Identify four difficulties common to restoration cleaning

6 Why clean? Increased value

7 Why clean? Increased value Aesthetics

8 Why clean? Increased value Aesthetics Preservation

9 Why clean? Increased value Aesthetics Preservation Diagnostic tool

10 Why clean? Increased value Aesthetics Preservation Diagnostic tool Historical significance

11 Four levels of contaminants Surface debris Surface deposits Surface soiling Subsurface staining

12 Four levels of contaminants Surface debris Dried, peeling paint Bird droppings Trash Twigs and leaves

13 Four levels of contaminants Surface debris Surface deposits Paint Varnishes Waxes Other man-made coatings

14 Four levels of contaminants Surface debris Surface deposits Surface soiling Carbon Grease Grime Air pollution

15 Four levels of contaminants Surface debris Surface deposits Surface soiling Subsurface staining Rust Oil Graffiti on porous surfaces

16 Four levels of contaminants Old buildings often feature all four levels of contaminants.

17 Three basic cleaning techniques Abrasive cleaning Water cleaning Chemical cleaning

18 Abrasive cleaning

19 Abrasive cleaning

20 Abrasive cleaning

21 Water cleaning Water Soaking Pressure washing

22 Water Soaking

23 Water Soaking May be useful for cleaning fragile masonry Time-consuming Impractical for cleaning entire facades

24 Water is the single most damaging element to masonry. Water Soaking

25 Pressure washing Best used with chemical cleaning Prewetting masonry with water Post cleaning water-rinse

26 Pressure washing Don t use high pressure to apply cleaning chemicals to masonry.

27 Pressure washing Pounds per square inch (psi) Gallons per minute (gpm)

28 Pressure washing Typical range for restoration cleaning psi 4-8 gpm

29 Chemical cleaning

30 Chemical cleaning Acidic 0-5 ph Neutral ph Alkaline 9-14 ph Solvent N/A

31 Acidic cleaners Often use hydrofluoric acid (HF) Are made for acid-resistant masonries Dissolve interface between stain and substrate

32 Acidic cleaners Remove decades of built-up soiling Are effective at lower concentrations Are dilutable and economical

33 Acidic cleaners Never clean with raw acid.

34 Proprietary products also include: Wetting agents Buffers Always follow safety and application instructions. Acidic cleaners

35 Acidic cleaners Industry looks to lower or eliminate acid content.

36 Acidic cleaners

37 Acidic cleaners

38 Acidic cleaners Not for marble, travertine, limestone or acid-sensitive masonry.

39 Alkaline cleaners Sodium hydroxide Potassium hydroxide Ammonium hydroxide

40 Alkaline cleaners Great against carbon and organic soiling Use on most masonry except polished marble

41 Alkaline cleaners Strictly follow all application and safety procedures.

42 Alkaline cleaners Surfaces must be neutralized after cleaning.

43 Alkaline cleaners Neutralize cleaned surface with mild acidic cleaning solution. Neutralizer enhances cleaned appearance. Products exist for this specific purpose.

44 Neutral cleaners Light-to-moderate soiling

45 Neutral cleaners May contain small amounts of mild acids or alkalies ph of 5.5 to 9.5

46 Neutral cleaners Advantages Reduced environmental impact Safer and easier to handle Fewer restrictions on use compared to more aggressive cleaners

47 Neutral cleaners Effective

48 Solvent cleaners Use for: High-strength paints Clear coatings Varnishes Waxes Acrylics Heavy oil & grease stains

49 Solvent cleaners Good choice for stains that aren t water-soluble Safe for all masonry surfaces

50 Solvent cleaners Some evaporate quickly. Many are extremely flammable. Always handle with care.

51 Interior restoration cleaning Often less severe than exterior staining

52 Interior restoration cleaning Considerations Restrict and control water use.

53 Interior restoration cleaning Considerations Restrict and control water use. Protect everything not set for cleaning.

54 Interior restoration cleaning Considerations Restrict and control water use. Protect everything not set for cleaning. Ensure good ventilation.

55 Interior restoration cleaning Agent characteristics Less aggressive Low-odor Need less water for rinsing May come in gel form

56 Masonry restoration cleaning Things to consider

57 Masonry restoration cleaning Likely to attract media attention Valuable free publicity Crews and job site may receive scrutiny.

58 Masonry restoration cleaning Likely to attract media attention Staining has built up over decades.

59 Masonry restoration cleaning Likely to attract media attention Staining has built up over decades. Surface may be fragile.

60 Masonry restoration cleaning Likely to attract media attention Staining has built up over decades. Surface may be fragile. Mistakes may be costly & irreversible.

61 Masonry restoration cleaning Art Science

62 Masonry restoration cleaning Impressive bullet-points for company resumes Improves our communities

63 Top 10 tips for restoration cleaning

64 Top 10 tips for restoration cleaning 1. Positively identify every substrate on the building.

65 Top 10 tips for restoration cleaning 2. Specify and use a proprietary cleaner from an established company that backs up its products. Literature Customer care Job-site and specification-writing assistance.

66 Top 10 tips for restoration cleaning 3. Require workers to religiously follow all safety precautions in the product literature.

67 Top 10 tips for restoration cleaning 4. Test before you clean.

68 Top 10 tips for restoration cleaning 4. Test before you clean. Test each kind of surface & each kind of soiling and stain. Not all mistakes can be fixed.

69 Top 10 tips for restoration cleaning 4. Test before you clean. Test under the same conditions you ll have for cleaning. Clean with the same dilution and equipment you tested.

70 Top 10 tips for restoration cleaning 4. Test before you clean. Be patient. Let interior test panels wait overnight. Let large-building test panels dry and weather for several days or more.

71 Top 10 tips for restoration cleaning 5. Protect everyone and everything not set for cleaning. Protective techniques Clean at night/on weekends. Divert traffic.

72 Top 10 tips for restoration cleaning Other protective techniques Use highest effective dilution rate. Protect nonmasonry surroundings. Don t clean in high wind. Shut down/cover air-handling equipment. Tell building management and occupants.

73 Top 10 tips for restoration cleaning Still more protective techniques Pre-rinse at low pressure. Monitor ph level of rinse water and masonry. Learn city requirements for handling rinse water.

74 Top 10 tips for restoration cleaning 6. Use the proper equipment. Apply with brush, roller or low-pressure spray.

75 Top 10 tips for restoration cleaning 6. Use the proper equipment. Dilute and handle in plastic buckets. Use high-pressure spray for rinsing. Fan-type spray tip minimum psi 4-8 gpm Be careful of fragile masonry when rinsing.

76 Top 10 tips for restoration cleaning 7. Don t let the cleaner dry in. Thoroughly prewet the surface. Reapply if necessary.

77 Top 10 tips for restoration cleaning 8. Begin cleaning slowly and cautiously.

78 Top 10 tips for restoration cleaning 9. Don t clean in cold weather without special precautions. 40 F or above - YES! Below freezing or will be overnight - NO!

79 Top 10 tips for restoration cleaning Special precautions for cold weather Prewet & rinse with hot water Extend dwell time percent

80 Top 10 tips for restoration cleaning Special precautions for cold weather Space heaters on scaffolding covered with polyethylene for cleaning in cold weather

81 Top 10 tips for restoration cleaning 10. Don t go it alone. Manufacturer s toll free telephone number Customer service Manufacturer s representative Distributor

82 The next step Trinity Church, New York, before restoration cleaning

83 The next step

84 The next step In the past, film-forming water repellents led to masonry decay.

85 The next step Today Breathable water repellents let vapor out without letting liquid in. Won t change masonry appearance. Preserve the results of your work.

86 The next step Protective Treatments for Masonry PRO004

87 Summary Reasons for masonry restoration cleaning Aesthetics Economics Diagnostics Historical and community value

88 Summary Techniques for masonry restoration cleaning Abrasive Water Chemical

89 Summary Water cleaning + Chemical cleaning = Most effective

90 Summary Guidelines for masonry restoration cleaning 1. Know the substrate you re cleaning. 2. Use proprietary cleaners from reputable companies. 3. Strictly follow all safety precautions. 4. Test before you clean. 5. Protect people and surroundings.

91 Summary Guidelines for masonry restoration cleaning 6. Use proper equipment. 7. Don t let cleaners dry into the surface. 8. Begin cleaning slowly and cautiously. 9. Don t clean in cold weather without special precautions. 10. Never go it alone.

92 Summary Protect what you ve cleaned.

93 PROSOCO SINCE 1939 Local contacts : Tom Lane / Cell: Ralph Morgan This concludes the American Institute of Architects Continuing Education System Program