Transcript The Body Audit

Feedback and
Development of the SER
Scheme for Jersey
Ian Paterson
Content

Background on scheme statistics

Highlight some common trends from
auditing process

Introduce new / revised documents

Some mirroring Scotland but also some
Jersey specific modifications
Scheme Statistics
On Island
Off Island
No of Bodies
7
7
No of Certifiers
16
9
Bodies Resigned
0
1
Certifiers Resigned
1
3
Bodies suspended
0
2
Certifiers suspended
0
1
Bodies audited
7
5
Certifiers audited
14
6
Average Audit Score (cert) 14.4
12.4
Certificates Issued
2417 (to 24/5)
Common Trends from Audits
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Lack of Clarity /misunderstanding of
certification content.
Inadequate scoping and planning.
Misuse of Options for certification
Lack of Project Records
Inadequate recording of checking / reviews
Acceptance of suppliers submissions without
understanding/enquiry
Lack of understanding of timber frame issues
Inappropriate wind loading for cladding
Use of Ka for propped retaining walls
New / revised Documents
New guidance:
 TB4 Conservatories
 TB5 Barriers
 TB6 Glazing
Updated guidance: – more explicit
 GN2 Options for Certification
 Audit Rules and Procedures
GN2 Options for Certification
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Already gone over the use of the various
options as part of the Timber Frame
seminar.
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Other purpose of this document is to
highlight that the list of items in
schedule 3 is not intended as (or
sufficient for) a scoping exercise.
Which leads on to the biggest single issue
with the operation of the scheme:
What are you certifying ?
It is important that we ALL understand this:
a) When signing / receiving certificates
b) At the end of the project
c) Part way through a project when
multiple certificates are being issued
d) When auditing
We ALL need to be clear on this, and have the
same understanding of the situation, at any point
in time.
We can only achieve that through scoping,
planning, care and clarity in wording on
certificates.
Changes to certificates
Tweaks to wording on certificate
Box to identify:
 Initial, or interim certificate
 Final Certificate
 Amendment to certificate
All certificates on a projects should be produced by
the one certifier – if that is not the case the “new”
certifier has to review, and take responsibility for,
the design of the entire project.
What are you certifying ?
The design of:
a) The elements listed in schedule 3 ?
b) The elements shown on your own drawings ?
c) The building structure ?
d) The design of the elements in the drawings
listed in schedule 1 ?
e) The design of all elements, except those listed
in schedule 2 ?
f)
The design of the building ?
Certification Plans - Scoping
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To ensure you have identified and dealt with all of the
relevant building elements you need to set about the
task in a methodical and thorough manner.
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All the relevant items should be identified prior to the
first certificate and a plan to obtain the necessary
information put in place.
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The list of items in schedule 2 should then decrease as
further certificates are issued.
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Yes client changes may lead to other elements being
generated but CP should be a live and developing
document.
Scoping Check List
We don’t want to issue scoping check lists as:
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Each project is different.
Check lists are a useful aide memoir but don’t
replace scrutiny of the project.
The certifier must assess each project, determine
what is relevant and plan his actions, and the
information flow, accordingly.
GN2 Appendix and Audit Guide give a useful start -
BUT it is your own experience and judgement which is
the best route to adequate scoping.
So What else should the
Certification Plan Contain ?
Certification plan is also a good place to record and/or
prompt you to consider:
a) Level of checking required.
b) Information considered ( Drawings, calculations,
reports, specifications etc – and who is responsible
for supplying).
c) Designer(s) and checker(s).
d) Design Codes.
e) SI requirements.
f) Disproportionate collapse.
g) Conversions – what considered.
Check Lists are a good aide-memoir but must still consider
each project on its own merits.
TB4 Certifying Structural Design of
Conservatories
Conservatories area problem because in England you can
build a conservatory up to 35m2 without a building warrant
– that is the biggest market for the manufacturers.
 Bye Laws definition of a conservatory
 Small conservatories (<20m2) at ground floor level
built as extensions exempt from bye law
requirements.
 If built at time of main house MAY still be exempt –
depending on Thermal separation.
 Superstructure may come as a complete unit
supported by UKAS (BBA) accreditation.
 More usually individual components may be certified.
TB4 Certifying Structural Design of
Conservatories
Where test certificates provided for component:
a) Pay particular attention to connections
b) Racking stability
c) Uplift
d) Possible need for ties to prevent eaves
spreading
In all cases where BBA certificates used in place of
calculations need to pay particular attention to
design codes, and wind loads and snow loads –
are these sufficient for your project ?
TB4 Certifying Structural Design of
Conservatories
Role of certifier is to confirm:
 That the structure has been designed to be stable
under appropriate loads.
 That the design of Individual members can be
substantiated by test or calculation.
 That the components are being used in a manner
compatible with test certification.
 That racking loads can be transmitted to either
foundations or main building.
 That the design is compatible with other building
elements.
 That the Permit/certificate drawings sufficiently
detailed.
TB5 Certifying the Design of
Protective Barriers
Barriers are “safety critical” and can be provided by:
Handrails, Balustrades, Glazed screens, Partitions.
Relevant Design Guidance:
 BS6399 Part 1
 BS6180:2011 “Barriers in and about Buildings –
Code of Practice” – serviceability requirements.
 Technical Guidance Document 7 published in
support of the Building bye-laws
 UK Guide to Safety at Sports Grounds [fifth edition
2008]
TB5 Certifying the Design of
Protective Barriers
Risk Based approach to certification:
 Traditional domestic with no long balconies and
limited risk to occupants – specification to
BS585 may be sufficient.
 On larger projects – mezzanine floors, longer
spanning stairs, balconies etc adequacy must
be assured by calculation or test.
 Freestanding Glass Barriers BS6180 – quite
stringent requirements.
In all cases remember design of barriers includes
fixings, and possibly rigidity of members to
which barrier is being fixed.
TB5 Certifying the Design of
Protective Barriers
Role of certifier is to ensure:
 Appropriate loads used in design/testing.
 Use of components compatible with testing.
 Design compatible with other elements.
 The barrier has sufficient stiffness and its
performance will not be impaired by deflections /
distortions of the supporting structure.
 The connections to the supporting structure have
been designed for the correct loadings.
 Permit drawings are sufficiently detailed to show that
the barrier will be constructed in accordance with the
appropriate regulations and standards.
TB6 Certification of Glazing
Systems
Even relatively small domestic projects can
have significant issues with glazing.
TB6 Certification of Glazing
Systems
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TB6 gives a definition of various types of
glazing.
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Explains how these are dealt with in Standards
and Codes.
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Confirms the role of the certifier.
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Sets out a methodology for assessing the risk
and categorising the glazing in a project.
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Sets out recommended actions for each of the
risk categories.
Issues determining Level of Risk
1.
2.
3.
4.
5.
6.
The inclination of the element
(vertical/horizontal/inclined).
Size of the glazing element (frame).
Size of a single pane.
Height of glazing above ground level.
Does the glazing form a barrier ?.
Ownership/public access to land
immediately outside building.
Low Risk
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Glazing Panels are Vertical
AND
Building Falls into RC1 (TB2)
AND
Top of highest window < 6m AGL
AND
Individual glazing panels < 8m2
AND
Individual panes of glass < 4m2
AND
Land for 0.5x building height not accessible to
public
AND
Window is not a barrier
AND
Mullions not required to sustain vertical loads
Medium Risk
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All inclined or horizontal panels
or
All glazing which constitutes a barrier
or
All glazing > 6m AGL
or
All glazing panels > 8m2
or
Land for 0.5 building height accessible
to public
or
Mullions required to transmit vertical load
AND
Glazing and building falls within range of
BS6262 and/or BS5516
High Risk
Building / glazing which falls outwith the
range of BS6262 or BS 5516
OR
Any point fixed glazing systems
OR
Any innovative glazing systems or design
approaches
Certification of Low Risk Glazing
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The certifier must ensure that the glazing
elements, (panes, frames and fixings) are
specified to comply with BS6262:2005 and/or
BS5616:2004 in the drawings submitted with
the design certificate.
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No further design substantiation will normally
be required and certificates can be signed off
on the basis of relevant standards having been
specified on the plans specification listed on the
design certificate.
Certification of Medium Risk Glazing
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Specify site specific loading conditions.
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Obtain copies of the supplier’s/manufacturer’s design calculations
and details (including fixings back to the primary structure).
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Satisfy himself that these have been carried out by a suitably
competent person.
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Ensure that the design has been carried out to the relevant
standards and loadings (dead, wind, imposed, maintenance, impact
etc).
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Confirm that the calculations have been checked (or carry out
checks as required).
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Satisfy themselves that the design and details are compatible with
that of the supporting elements of the building (including
appropriate deflections, tolerances and provision for differential
movement).
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Record that these options have been certified using options 2 or 3
(SER Jersey Guidance Note 2) in Schedule 3 of the
Design Certificate.
Certification of High Risk Glazing
Most certifiers will have insufficient experience to be able to
design these elements an in such circumstances the advice of
an acknowledged expert should be sought, either to carry out,
or confirm, the design.
In these circumstances the certifier should:
 satisfy himself of the relevant expertise of the “expert”.
 satisfy himself that the design has been checked by a
suitably experienced individual.
 obtain copies of the supplier’s/manufacturer’s design
calculations.
 ensure that the design has been carried out to the
relevant standards and loadings.
 satisfy himself that the design is compatible with that of
the supporting elements of the building.
 record that these elements have been certified using
Option 4 (SER GN2) in Schedule 3 of the certificate.
Acceptance of Test Results
Alternatively suitable accredited test results,
which are appropriate to the panel size,
aspect ratio and loading of the elements
under consideration, may be accepted in the
place of design calculations.
- but don’t forget glazing comprises
glass, frame and the fixings back to
the main cladding/structure.
Changes to Audit Procedures
Guide
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Some minor procedural tweaks to the
audit process – principally involving
timescales.
Some clarification of requirements – not
changes just more explicitly stated
Some changes common to both Jersey
and Scotland
Some changes specific to Jersey
Changes for Bodies
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Bodies will be penalised for poor /
inconsistent performance of certifiers.
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Access to information – if hard copy
regular currency checks.
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Training – mark down for CPD failures.
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Timescales for audits – and responses.
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Protection of certifiers from loss.
Changes for Certifiers/Projects
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More explicit in requirements and
major/minor non conformances (rarely
adds to intent).
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Absence of checking = absence of
calculations.
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Design imposed loads to be identified on
drawings.
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Stability frames/racking panels/elements
to be identified on drawings.
Changes for certifiers/projects
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Timber frame requirements more explicit –
reflecting issues discussed today.
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Further guidance on requirements for
steel/concrete and masonry.
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Reflect content of TB5 and 6.
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More detail on requirements for cladding.
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Fire protection introduced.
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Operating within competence.
Relaxation on Requirements
for Ground Investigation
Preconstruction GI not required for:
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Domestic buildings not greater than 2
stories (or 3 if third is room in roof) with
simple pads and strips.
OR
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Single storey steel framed buildings where
allowable bearing capacity unlikely to be the
determining factor in sizing foundations.
Relaxation on Requirements
for Ground Investigation
BUT
 Trial pits extending to a suitable depth below the
formation (to check for softer underlying strata)
to be carried out, inspected and recorded at time
of foundation excavations.
 In all other cases full SI required pre certificate
In all cases a note to be added to permit plans
recoding anticipated ground conditions and allowable
bearing capacity used in foundation design.
Changes to Scoring
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Most of changes just better explanation
– not really altering intent.
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However as a result of more points
defined probability increased scores at
audit.
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No intention to make audits harder so
scoring categories have been amended
(raised) to compensate for this.
Happy Certifying
!!!!!!!!!!!!!!!!!!!!!!