10.15 11.00 RCI 27th March 2019 Mike... · 2019-05-15 · Dr. Mike Wiseman Team Manger -...
Transcript of 10.15 11.00 RCI 27th March 2019 Mike... · 2019-05-15 · Dr. Mike Wiseman Team Manger -...
Dr. Mike WisemanTeam Manger - Construction Products
10.15 – 11.00
27th March 2019
The Assessment of Durability, With Reference to
Roof Waterproofing
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RCI
Who is the BBA and what do we do?
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The British Board of Agrément (BBA) was founded to liberate the potential of
innovative construction products via an assessment and certification process.
Over 50 years we have helped launch 1000’s of new products into the construction
sector. Our brand is trusted by specifiers, designer, assessors, insurance and lending
companies, and building control inspectors throughout the UK.
Our brand is synonymous with quality.
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Our Stakeholders and Responsibilities
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Our ClientsSpecifiers and
Users
BBA Certification
Government and Local Authorities
Defines assessment criteria, identify test program and provides ongoing reassurance to the industry of high quality and exceptional service
Expect the BBA to provide impartial and expert advice in relation to new policies, new standards in times of emergency
Rely on the reputation of the BBA brand to:
• Facilitate a sale
• Gain access to a market opportunity or
• Demonstrate that their products have
been subject to a stringent assessment
by the UK’s leading construction
products certification authority
Trust the BBA to provide accurate descriptions of products and frequently ask for BBA Certification as a precursor for selection
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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
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BBA VALUES
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Product Approval and Certification
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As well as specialising in the BBA’s core business, Agrément
Certification, our Product Approval & Certification (PAC)
business unit also offers other varying services:
• HAPAS (Highways Authority Product Approval Services),
• BIM (Building Information Modelling)
• Object Assurance and
• an all-encompassing expanse of products contained
within the building and construction envelope.
Our certification is UKAS accredited and widely recognised
across the construction industry.
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Audit and Inspection
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Our Audit and Inspection unit comprises of three areas:
Construction, Management Systems and Post-Agrément
on-site inspections.
• Construction focuses on installations and installers
through inspections at various stages.
• Management Systems supports businesses through product quality manufacturing assessment and ISO
services.
• Post-Agrément on-site inspections, evaluations and
assessments to ensure certified products continue to
comply with quality and safety standards.
BBA Audit and Inspection maintains high standards of quality and safety in our industry.
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Test Services
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Testing has been a key part of Agrément
Certification for over 50 years. In that time
our UKAS accredited Testing Facilities has
extended to cover over 40 different products
areas within the construction industry.
In 1985, the BBA set up a separate department
specifically to undertake testing in support of
BBA Certification. Since then BBA Test Services
has become a UKAS accredited, independent
test facility and now shares its many years of
expertise and experience with manufacturers
across the UK, and beyond.
RCI – Dr Mike Wiseman CPD - © British Board of Agrément. All Rights reserved Strictly Confidential
8 RCI – Dr Mike Wiseman CPD - © British Board of Agrément. All Rights reserved Strictly Confidential
Assessment of Durability of Roofing Membranes
Introduction
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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.
Membranes are most commonly made from modified bitumen,
thermoplastics (e.g PVC, TPO), synthetic rubber and liquid-applied
membranes (polyurethanes).
What are Roofing Membranes?
Assessment of Durability of Roofing Membranes
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The BBA has over 100 staff-years of experience in assessing the durability of
roofing membranes.
When the BBA was formed In 1966, the durability of roofing membranes was relatively unknown. Over time, the durability of installed membranes/ systems
has exceeded the predicted durability statements given by of the BBA.
Based on an evaluation of performance and experience, the BBA states an opinion as to the minimum service life of membranes/ systems tested under
normal service conditions.
Assessment of Durability of Roofing Membranes – BBA Agrément Certificates
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Assessment of Durability of Roofing Membranes - Criteria
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An Assessment Programme is defined according to the performance requirements or
claims of the membrane:
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?
Assessment of Durability of Roofing Membranes
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How are durability
statements formed?
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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’s experience and knowledge of roofing materials performance
Testing Programmes
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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
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)
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Testing Programmes
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The test programme used to assess roofing membranes is
dependent on the type of roofing material:
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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.
Testing Programmes
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ETAG 005 Parts 1 & 6 - Polyurethanes MOAT 64
Testing Claims
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Moderate (M) Severe (S)
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ETAG 005
Testing Claims
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ETAG 005
Testing Claims
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ETAG 005
Testing Claims
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ETAG 005
Testing Claims
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The longest duration 30 year assessment programme includes the following:
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>300 days UV exposure
240 days heat exposure
210 days water exposure
Testing Claims – Bond strength, water exposure(corrosion)
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Testing Claims – Fatigue (cracking)
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Crack
Testing Claims – Watertightness (holes)
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Testing Claims – Low temperature flexibility (cracking)
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Assessment – Test Data
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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.ethe deterioration in tensile strength when comparing
controls to conditioned
samples.
An opinion of performance is reached after
considering all of test data.
Assessment of Aged Roofing Installations
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• 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 required (date of installation and
product specification)
• Roofs must be accessible for inspection
• Where required, permission granted to take samples and
to repair roof (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.
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• Assessments are carried out to assess the condition/ deterioration of membranes in time (20
years old and older).
Assessment of Aged Roofing Installations – Levels of durability
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Liquid-Applied Roof Waterproofing
Up to 30 years Extended laboratory durability testing (UV, heat and water exposure)
30 Years Either site visits to 3 sites (25 years plus) or extended laboratory durability
testing (UV, heat and water exposure)
35 Years Site visits to three sites of 30 years plus.
40 years As for 35 years with a requirement for a formal surveillance/maintenance
scheme.
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Assessment of Aged Roofing Installations – Levels of durability
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Polymeric membranes
25 Years Heat and UV ageing criteria as set for category W3 from ETAG 005 with tests as
set in 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 of 10 years upwards 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.
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Assessment of Aged Roofing Installations – Levels of durability
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Bitumen membranes25 Years The heat ageing criteria as set for category W3 from ETAG 005 with tests as set in
MOAT 64.
30 years Visits to 3 sites (25 years plus) 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 three sites of 30 years plus where the membrane is used exposed. Full
inspection carried out.
35 Years Visits to three sites of 30 years plus 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.
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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
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Example Assessment
criteria
Site Assessment Report
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• For bonded and mechanically fixed roofs, an Assessment Report is written
inclusive of:• evidence of the date of installation
• which membrane/ system was installed
• photographs evidence supporting the findings of the Assessment.
• The report is independently assessed by a BBA Project Manager.
• An opinion of the performance and maintenance of roof membranes is
formed, which supports a durability statement, or extends an existing
durability statement.
Assessment of Aged Roof samples – Laboratory ageing/ testing
33 RCI – Dr Mike Wiseman CPD - © British Board of Agrément. All Rights reserved Strictly Confidential
• For mechanically fixed roofs, a sample is taken from 1 roof site (3m2), usually the oldest. The
repair of the sample location is witnessed.
• Depending on the age of the roof membranes and what durability statement is required, site
samples may be further aged under laboratory conditions and then subjected to testing.
• Aged site samples are compared to control samples (unaged). Examples of tests carried out:
• low temperature foldability/ flexibility
• tensile strength/ elongation
• impact resistance
• The test results are assessed by a Project Manager and an opinion is formed about loss of
performance over time.
Assessment of Aged Roofing Installations + Laboratory Ageing/ Testing
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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.
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Maintenance schemes
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A maintenance schedule, deemed acceptable to the BBA, allows
a durability statement to be extended by 5 years i.e from 35 to 40
years
The BBA does not consult on what is regarded as good
maintenance but assesses the maintenance schedule proposed.
RCI – Dr Mike Wiseman CPD - © British Board of Agrément. All Rights reserved Strictly Confidential
Future Durability Considerations
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The BBA will continue to review its durability policies over time and
may extend them where there is technical justification to do so.
Extension of BBA Certificate Approval
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Zero fall roofs
Blue roofs (waterproofing only or full system assessments)
Green roofs/ roof gardens
Walkways and balconies
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Self-adhesive, bonded, partially bonded, mechanically fixed
Warm roof systems
Car park decks
Tanking applications
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Any Questions?
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Thank you