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Surface Preparation - QA Assessments (con’t)

Ensure the quality and extent of coating feathering, test moisture content, assess coating application and thickness, and evaluate surface preparation standards for optimal results. For more information, refer to the article by Ken Trimber and Kevin Brown in Durability+Design magazine.

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Surface Preparation - QA Assessments (con’t)

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  1. Extent/quality of feathering required Test the integrity of the coating that remains after cleaning Surface Preparation - QA Assessments (con’t)

  2. Examine surface for unacceptable levels of moisture. Moisture Content – QA Assessments

  3. Sources include pre-existing moisture, moisture from pressure washing, and external sources such as leaks and ground water Moisture Content – QA Assessments

  4. Moisture meters and plastic sheet tests (ASTM standards; SSPC standard under development) Moisture Content – QA Assessments (con’t)

  5. Schedule QA inspection to verify complete mixing Hand/mechanical/boxing Thinning (within VOC limits) Partial kits Pot life Confirm that the correct coatings and colors are applied – can be very complicated when many substrates involved Coating Material and Mixing – QA Assessments

  6. Pay attention to limited access areas and difficult configurations Stripe coats on steel Coating Application – QA Assessments

  7. Back rolling and back brushing Coating Application – QA Assessments(con’t)

  8. Correct number of coats applied Drying time between coats Cleanliness between costs Coating Application – QA Assessments (con’t)

  9. Wet film thickness during application (ASTM standard) Coating Application – QA Assessments (con’t)

  10. Dry film thickness (non-destructive) – concrete and steel (ASTM and SSPC standards) Coating Application – QA Assessments (con’t)

  11. Dry film thickness (destructive) – concrete and steel (ASTM standard) Coating Application – QA Assessments (con’t)

  12. Pinholes and coverage (SSPC pinhole guide under development) Weep Spouts Coating Application – QA Assessments (con’t)

  13. Continuity/Air barrier (ASTM Standard) Coating Application – QA Assessments (con’t)

  14. Continuity of Sealant Rilem Tube Coating Application – QA Assessments (con’t)

  15. SSPC-SP1 through SP16 (solvent, hand/power tool, abrasive blast cleaning, waterjetting) SSPC-VIS1 through VIS 5 (hand/power tool, dry blast, wet blast, waterjetting) SSPC-SP13/NACE No. 6, Surface Preparation of Concrete ICRI Guideline No. 310.2 (formerly 03732), Selecting and Specifying Concrete Surface Preparation for Sealers, Coatings, and Polymer Overlays Surface Preparation Standards Cleanliness

  16. ASTM D4417, Standard Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel SSPC-PA17, Procedure for Determining Conformance to Steel Profile/Surface Roughness/Peak Count Requirements ICRI 310.2-9, Concrete Surface Profile (CSP) Coupons Surface Preparation Standards Roughness

  17. ASTM D4263, Standard Test Method for Indicating Moisture in Concrete by the Plastic Sheet Method(Many ASTM standards are available for moisture testing of floors using instruments, calcium chloride, RH probes; SSPC is currently developing a guide for testing moisture in walls) SSPC-Guide 6, Guide for Containing Surface Preparation Debris Generated During Paint Removal Operations Surface Preparation Standards Moisture and Containment

  18. ASTM D4414, Standard Practice for Measurement of Wet Film Thickness by Notch Gages SSPC-PA2, Procedure for Determining Conformance to Dry Coating Thickness Requirements ASTM D7091, Standard Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals Coating Thickness Standards

  19. SSPC-PA9, Measurement of Dry Coating Thickness on Cementitious Substrates ASTM D6132, Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Coating Thickness Gage ASTM D4138, Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means Coating Thickness Standards (con’t)

  20. ASTM D4214 Standard Test Methods for Evaluation Degree of Chalking of Exterior Paint Films ASTM D3359, Standard Test Methods for Measuring Adhesion by Tape Test ASTM D4541, Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers ASTM E1186, Standard Practices for Air Leakage Site Detection in Building Envelopes and Air Barrier Systems (SSPC is currently developing pinhole standard and a guide for laboratory testing of thin film coatings on CMU to serve as air barriers) Coating Characteristics

  21. QA Assessment Checklist

  22. QA Assessment Checklist (con’t)

  23. QA Assessment Checklist (con’t)

  24. More Information • More information on the topics in this webinar can be found in an article written by Ken Trimber and Kevin Brown – KTA, published in Durability+Design magazine: • Jan/Feb 2014 – Spot Assessments of Ongoing Cleaning and Painting Projects

  25. Questions? Ken Trimber – 412-788-1300, x204 (ktrimber@kta.com)

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