107 quality control

QUALITY CONTROL
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QUALITY CONTROL
The designer(s), manufacture and
contractors must ensure that minimum
quality standards are met and
maintained.
They must make sure that the
building will perform as required and
expected by its owners and occupiers.

ISO 9001 & QUALITY ASSURANCE
process approach to system;
process measurement
Process management;
customer satisfaction
monitoring;
continual improvement.

ISO 9001: 2000 also puts a stronger
emphasis on the quality management
function of the organization as distinct
from:
quality assurance
quality control activities
five requirements.

 The ISO 14000 series consist of five
standards:
1. Environmental management systems
2. Environmental auditing
3. Environmental labelling
4. Environmental performance evaluation
5. Life cycle assessment

QUALITY CONTROL
Construction Quality and Construction
Quality Control (QC) Inspectors
 All construction processes,
procedures, and workmanship must
be inspected Quality Inspectors.
 Inspection should include the
observations, measurements, and
documentation specified in
contractor’s Method Statement and
the Contract Documents.

QUALITY CONTROL
Quality Control (QC) Testing Staff
 Sampling and testing of field-tested Materials in
accordance with the contract documents.
 Certified Testing Laboratory
 Independent Referee Laboratory
Materials Quality Management
 Contractor is responsible for providing Quality
Control (QC) sampling and testing, and carrying
out Quality Level Analysis during production to
submit when required by the client or client
representative.

QUALITY CONTROL
Quality Assurance
 Client’s QA Program defines the responsibilities
and roles of both contractor and it’s sub-
contractors.
 The QA Program is contained in the contract
document.
 The contractor is responsible for providing QC
sampling and testing of all the Materials
specified in the contract document.

QUALITY CONTROL
 In practice Building Control Officers (BCOs) and
inspectors are prepared to provide some advice
where they can and if they visit.
Large Private Developments – Sites where
main contractor is client
 These sites are often those being developed by a
large private house builder.
 The house builder/developer will often have a
project manager and site manager.
 Larger sites-assistant site managers who have
responsibility for quality control.

QUALITY CONTROL
 BCOs and inspectors from the Local Authorities
are prepared to provide some advice where they
can and if they visit.
 However, it is not their role.
 Often, the emphasis, on sites of this nature, is on
getting the work done as quickly as possible to
the minimum standard required to satisfy the
warranty provider and possibly the BCO.
 This emphasis has developed as a result of
commercial pressures on time and finance and
the lack of skilled tradesmen.

QUALITY CONTROL
Large Private Developments
(where main contractor is not
client)
 The project manager/site manager
for the contractor have to satisfy the
client or their agents that the work
done meets the standard required.
The standard required will normally
have been agreed as part of the
original contract and the
specification.

QUALITY CONTROL
It is the responsibility of the:
project manager
site manager/
assistant site managers
foremen to ensure that the
quality of work carried out meets
the requirement of the
specification.

QUALITY CONTROL
Under Design & Build contracts:
 Most of the responsibility for quality
control of design, specification and
construction rests with the main
contractor.
 Under many forms of Design & Build
contract the client is able to check build
quality through the use of:
1. their own Clerk of Works
2. third-party inspection service providers.

QUALITY CONTROL
Quality Assurance Schemes
 The National Standards Authority of
Ireland (NSAI) is Ireland’s Standards
body.
 They facilitate the development of
voluntary standard documents.
 NSAI is a leading supplier of product and
system certification services, both
domestically and internationally.
 The NSAI represent Irish interests in
European and international Standards
bodies.

QUALITY CONTROL
 The NSAI are responsible for the Timber
Frame Manufacturers’ Quality Approval
Scheme.
 The scheme does not apply to timber
frame buildings, which are fabricated on
site (stick buildings).
 It is based on the requirements of the
Irish Building Regulations, TGDs and
relevant Irish and British Standards.

QUALITY CONTROL
It considers:
 Design
 QA procedures related to design and
manufacture
 Material specifications
 Manufacturing process
 Manufacturing information and
documentation
 Production facilities

QUALITY CONTROL
Site information and documentation
Quality records
Personnel
Training

QUALITY CONTROL
 HomeBond is a private company set up by the
Construction Industry Federation (CIF).
 It operates independently of the CIF
HomeBond is a warrantor and inspects
constructions to determine:
 ‘good practice’ and/or HomeBond requirements
are being met.
 HomeBond does not underwrite developments
 but provides cover in the event that the
developments are not soundly constructed with
the appropriate materials.

QUALITY CONTROL
HomeBond covers the dwelling against:
 Major structural defects such as:
1. major defect in the foundations of a
dwelling
2. the load-bearing part of its floors
3. walls and roof or retaining walls
necessary for its support which affects the
structural stability of the dwelling’.

QUALITY CONTROL
Major non-structural defects which
might lead to problems such as:
1.Smoke
2.Water penetration from an adjacent
building into the completed home.

QUALITY CONTROL
 A variety of sources of technical information
exists for those involved in the design,
manufacture and construction of timber frame
buildings in Ireland.
The principal sources of technical information for
each of the disciplines involved is set out below:
Architects
 Guidance is given in the Technical Guidance
Documents on how to meet the requirements of
the National Building Regulations.

QUALITY CONTROL
 The requirements of HomeBond are
published in their House Building
Manual.
 Appendix B of the House Building Manual
publication relates to timber frame
construction.
 Additional guidance, relating specifically
to on-site practice is given in their Right
On Site leaflets.

QUALITY CONTROL
 The TRADA Technology publication (Timber
Frame Construction) provides a source of
standard details and advice on issues such as:
1. good practice guide
2. a site supervisor checklist
3. guidance on appropriate material specifications.
 In-company standard details or standard details
issued by the timber frame manufacturer.
 WOODSPEC
 TRADA/BRE Design Guide for Multi Storey
Timber Frame Buildings – Timber Stairs.


QUALITY CONTROL
Engineers
 Guidance is given in the Technical
Guidance Documents on how to meet the
requirements of the National Building
Regulations.
 BS 5268: Part 2: 1996: Structural use of
timber – Code of practice for permissible
stress design, materials and
workmanship.

QUALITY CONTROL
IS 193: 1996: Timber trussed rafters
for roofs.
IS 444: 1998: Use of structural
timber in buildings.
BS 5268: Part 4: 1978: Structural
use of timber – Fire resistance of
timber structures.
Section 4.1. Recommendations for
calculating the fire resistance of
timber members.

QUALITY CONTROL
timber – Fire resistance of timber
structures.
 Section 4.2. Recommendations for
calculating the fire resistance of timber
stud walls and joisted floor constructions.
timber – Code of practice for timber
framed walls.
 Section 6.1. Dwellings not exceeding four
storeys.

QUALITY CONTROL
Site Managers
 In-company documentation.
 The requirements of HomeBond are published in
their House Building Manual.
publication relates to timber frame construction.
 Additional guidance, relating specifically to on-
site practice is given in their Right On Site
leaflets.

QUALITY CONTROL
 The TRADA Technology publication, Timber
Frame Construction, provides a source of
standard details and advice on good practice
including a site supervisors’ checklist and
guidance on appropriate material specifications.
 Guidance is given in the Technical Guidance
Documents on how to meet the requirements of
the National Building Regulations.
 TRADA/BRE Design Guide for Multi Storey
Timber Frame Buildings – Timber Stairs.

QUALITY CONTROL
Clerk of Works
 In-company documentation.
 The requirements of HomeBond are published in
their House Building Manual.
publication relates to timber frame construction.
Additional guidance, relating specifically to on-
site practice is given in their Right On Site
leaflets.

QUALITY CONTROL
The TRADA Technology publication,
Timber Frame Construction,
provides a source of standard details
and advice on good practice
including a site supervisors’
checklist and guidance on
appropriate material specifications.

QUALITY CONTROL
Guidance is given in the Technical
Guidance Documents on how to meet
the requirements of the National
Building Regulations.
TRADA/BRE Design Guide for Multi
Storey Timber Frame Buildings –
Timber Stairs.

107 quality control

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