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Testing, Testing and Certification (and the Durability of Roof Waterproofing Membranes) #SPRACOnference2019

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Presentation by Simon Wroe, BBA at the Single Ply Roofing Association Conference 2019 at Heythrop Park, Oxfordshire.
More information:https://spra.co.uk/events/spra-awards-2019-live-blog/

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Testing, Testing and Certification (and the Durability of Roof Waterproofing Membranes) #SPRACOnference2019

  1. 1. Simon Wroe Head of Key Accounts 13 June 2019 Testing, Testing and Certification (and the Durability of Roof Waterproofing Membranes) 1 5th Annual SPRA Conference
  2. 2. Who are the BBA and what do we do? 2 The British Board of Agrément (BBA) was established in 1966 primarily to determine the performance of innovative construction products via independent testing, assessment and certification. In 53 years the BBA has issued 5665 Agrément Certificates in the Construction sector and 290 HAPAS Certificates in the Highways sector. Currently approximately 1200 Certificates and 2400 Product Sheets are valid. The BBA brand and logo are recognised by specifiers, designers, insurance companies, and building control inspectors throughout the UK. RCI – Dr Mike Wiseman CPD - © British Board of Agrément. All Rights reserved Strictly Confidential
  3. 3. COURAGE – To challenge and change INTEGRITY – To act without fear or favour to be fair and true QUALITY – What we do, we do well LOYALTY - To our values COLLABORATION – To realise potential PASSION – About doing well by our clients ACCOUNTABILITY – Each of us responsible for making the difference that matters Our Values 3 BBA VALUES
  4. 4. Our Stakeholders and Responsibilities 4 Our Clients Specifiers and Users BBA Certification Government and Local Authorities Provides specific criteria via dedicated test and assessment programmes with Certificates providing ongoing reassurance of performance and quality to the construction industry and public Rely on the BBA to provide impartial and expert advice in relation to new policies and standards Rely on the BBA brand to: • Facilitate sales • Gain access to a market opportunity or • Independent confirmation that products meet minimum performance requirements Use BBA Certification: • as a requirement for tenders and selection • to meet Building Regulations.
  5. 5. Product Approval and Certification 5 Product Approval & Certification (PAC) is the BBA’s core business unit for Agrément Certification and European Technical Assessments (ETAs). PAC comprise technical teams within the Engineering and Construction Product Departments with dedicated technical support provided by the BBA Technical Excellence Directorate. In addition PAC also provides services for • Thermal modelling • Building Information Modelling (BIM) and Object Assurance • Microgeneration Certification (MCS) BBA certification is UKAS accredited and widely recognised across the construction and highways industries. RCI – Dr Mike Wiseman CPD - © British Board of Agrément. All Rights reserved Strictly Confidential
  6. 6. Audit and Inspection 6 Our Audit and Inspection unit comprises three areas: • Construction focuses on installations and installers through inspections at various stages. • Management Systems supports businesses through product quality manufacturing assessment and ISO 9001, 14001 and 18001 services. • Post-Certificate on-site inspections, evaluations and assessments to ensure certified products continue to comply with quality and safety standards. BBA Audit and Inspection maintain high standards of quality and safety.
  7. 7. Test Services 7 Testing has been a key part of Agrément Certification for over 50 years. Our UKAS accredited Testing Facilities cover over 40 different products areas within the construction and highways industries.
  8. 8. Definition of Roofing Membranes 8 Roofing Membranes provide a waterproofing layer either singularly or as part of a multi-layered system to protect the interior of structures from water damage. Roof Waterproofing Membranes are most commonly made from: • Modified bitumen sheets • Polymeric thermoplastic sheets (e.g PVC, TPO) • Synthetic rubber and liquid-applied membranes (e.g polyurethanes).
  9. 9. Assessment of Durability of Roofing Membranes - Criteria 9 An Assessment Programme is defined according to the performance requirements of the membrane type or to verify the claims of the Applicant/manufacturer: What is the durability expectation of the membrane? Will the membrane be used in exposed or protected specifications in service? Which climatic regions and conditions will the membrane perform in? What is the limit of slope in specifications?
  10. 10. Assessment of Durability of Roofing Membranes 10 How are durability statements formed? 1. Following a thorough assessment programme of defined laboratory tests including accelerated ageing/ weathering conditioning 2. Assessments of the condition of aged roofing membranes on site 3. Assessments of aged roofing membranes after further accelerated ageing/ weathering conditioning and testing 4. Assessment of maintenance schemes 5. BBA experience and knowledge of roofing material performance
  11. 11. Testing Programme 11 The current maximum durability offered to any new roofing membrane, successfully passing an accelerated weathering assessment programme, is 30 years. Lower durability claims can be tested but typically not less than 10 years. The highest exposed durability statement is currently, in excess of 40 years Fully Protected systems can be given a durability statement for the design life of a building (defined by BBA to be 60 years)
  12. 12. Test Programmes 12 The test programme used to assess roofing membrane performance is dependent on the type of roofing material: Bitumen based membranes – MOAT 64 UEAtc Technical guide for the assessment of roof waterproofing systems made of reinforced APP or SBS polymer modified bitumen sheets Polymeric membranes – MOAT 65,66, 67 Liquid-applied membranes – European Technical Approval Guideline (ETAG) 005 Parts 1 to 8.
  13. 13. Testing Claims 13 The longest duration 30 year assessment programme for new materials includes: • Bond strength including effect of water exposure • Fatigue resistance (cracking) • Watertightness including joints • Low temperature flexibility (cracking) >300 days UV exposure 240 days heat exposure 210 days water exposure
  14. 14. Assessment – Test Data 14 For some tests the pass/fail criteria is clear; i.e whether a membrane is resistant to cyclic fatigue or not? Other tests require a judgement i.e the deterioration in tensile strength when comparing controls to conditioned samples. An opinion of performance is reached after considering all of test data.
  15. 15. Assessment of Durability of Roofing Membranes – BBA Agrément Certificates 15
  16. 16. Increased Durability via Assessment of Aged Roofing Installations 16 • Typically, 3 sites of differing locations. Site assessments do not have to be in the UK, however, climatic conditions are compared to those of the UK to determine exposure levels (UV/solar heat gain etc). • Proof of installation is required (date of installation and product specification) • Roofs must be accessible for inspection • Where required, permission must be granted to take membrane samples and make good (mechanically fixed only) • Mechanically fixed roofs have the advantage that samples can be aged further in the laboratory, to extend durability. • Bonded membranes are limited to site assessment only. • Assessments are carried out to assess the condition/deterioration of membranes of existing roofs (20 year old sites).
  17. 17. Assessment of Aged Roofing Installations – Levels of durability 17 Bitumen membranes 25 Years The heat ageing criteria as set for category W3 from ETAG 005 with tests as per MOAT 64. 30 years Visits to 3 sites (25 years +) where the membrane is used exposed. The increase in the age of site requirement reflects the difficulty in taking suitable samples for assessment. Full inspection carried out. 35 Years Visits to 3 sites of 30 years + where the membrane is used exposed. Full inspection carried out. 40 Years As for 35 years, as well as, a scheme of annual inspections carried out by the Certificate holder's representatives.
  18. 18. Assessment of Aged Roofing Installations – Levels of durability 18 Liquid-Applied Roof Waterproofing Up to 30 years Extended laboratory durability testing (UV, heat and water exposure) 30 Years Either 3 site inspections of 25 years + or extended laboratory durability testing (UV, heat and water exposure) 35 Years 3 site inspections of 30 years + 40 years As for 35 years with a requirement for a formal surveillance/maintenance scheme. RCI – Dr Mike Wiseman CPD - © British Board of Agrément. All Rights reserved Strictly Confidential
  19. 19. Assessment of Aged Roofing Installations – Levels of durability 19 Polymeric membranes 25 Years Heat and UV ageing criteria as set for category W3 from ETAG 005 with tests as per MOATs 65, 66 or 67. 30 years Visits to 3 sites (20 years plus) where the membrane is used exposed, at least one of the sites needs to be a mechanically fastened installation so samples can be taken for testing. Comparison testing is carried out on aged and new samples. The type of testing is dependent on polymer type. Newer sites, at least 10 years old can be used but additional accelerated ageing to an appropriate level is carried out. 35 Years As first paragraph of 30 years with additional accelerated ageing included in the sample testing. 40 Years As for 35 years, as well as, a scheme of annual inspections carried out by the Certificate holder's representatives.
  20. 20. Mineral loss Cracking Tearing Water penetration Lap condition Ponded water/ drainage Biological growth Detailing Evidence of repair(s) & quality of repair(s) Site Assessment Criteria 20 Example Assessment criteria
  21. 21. Site Assessment Report 21 • An Assessment Report is written inclusive of: • evidence of the date of installation • which membrane/ system was installed • photographic evidence supporting the findings of the Assessment. • The report is independently assessed by a BBA Project Manager and verified by the Technical Expert for Roof Waterproofing. • An opinion of the performance and maintenance of the roof membrane is made and if satisfactory an increase to the existing durability clause.
  22. 22. Assessment of Aged Roof samples – Laboratory ageing/ testing 22 • For mechanically fixed roofs, a 3m2 sample is taken from 1 roof site, usually the oldest. The repair of the sample location is witnessed. • Depending on the age of the roof membrane and verification of the required durability statement, site samples may be further aged under laboratory conditions and then subjected to testing. • Aged site samples are compared to unaged control samples unaged. Tests include: • low temperature foldability/ flexibility • tensile strength/ elongation • impact resistance • The test results are assessed and an opinion is formed concerning increased durability against loss of performance over time.
  23. 23. Assessment of Aged Roofing Installations + Laboratory Ageing/ Testing 23 An overall opinion of the performance and maintenance of roof membranes is formed, combining the conclusions of the Site Assessment Report and Laboratory Test Report.
  24. 24. Extension of BBA Certificate Approval 24 Zero fall roofs Blue roofs (waterproofing only or full system assessments) Green roofs/roof gardens Walkways and balconies RCI – Dr Mike Wiseman CPD - © British Board of Agrément. All Rights reserved Strictly Confidential Self-adhesive, bonded, partially bonded, mechanically fixed Warm roof systems Car park decks Tanking applications
  25. 25. 25 Thank you

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