Transcript New Building Regulations L1 and L2

New Building Regulations L1
Presented by
Robert Eglington
Regional Director of MLM Building Control
New Building Regulation L1
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The new Regulations have been
published and the approved documents
are currently in draft form only
The proposed date of implementation of
the changes is April 6 2006
We understand the Statutory
Instrument and final documents will be
published in March 2006
New Building Regulation L1
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The ODPM issued the 300 page
consultation document in July 2004
They invited comment from across the
entire building industry including all
professional bodies
The document was made up of 12
sections
New Building Regulation L1
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Section 1 – Regulatory impact
assessment
Section 2 – New document ADL1A
Section 3 – New document ADL1B
Section 4 – New document ADL2A
Section 5 – New document ADL2B
Section 6 – Possible future performance
standards
New Building Regulation L1
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Section 7 – Implementation of the
Energy Performance of Buildings
Directive
Section 8 – Calculations methodologies
of the Energy Performance of Buildings
Directive
Section 9 – Adaptation Strategy
Section 10 – Dissemination strategy
New Building Regulation L1
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Section 11 – Code of practice on
consultation
Section 12 – Response form
New Building Regulation L1
Draft regulatory impact assessment
 An assessment of national benefits
 An assessment of costs on certain building
types
 An indication of the impact on certain
buildings
 An explanation of the reasons behind the
proposed changes
New Building Regulation L1
Draft regulatory impact assessment
 Purpose – “to further improve the energy
efficiency of buildings in response to the aim
declared in the Energy White Paper and the
aims set out in article 1 of the Energy
Performance of Buildings Directive”
 Background – the 2002 changes increased
thermal performance by 25% at a increased
cost of up to 3% on construction
New Building Regulation L1
Draft regulatory impact assessment
Energy White Paper
 To achieve substantial reductions in CO2
emissions
 Encouragement to improve in energy
efficiency
 Encouragement of the selection of energy
sources and generating technologies that
produce much less, or no, carbon
New Building Regulation L1
Draft regulatory impact assessment
Energy White Paper
 The target is to achieve a 60% reduction in
carbon emissions by 2050
 Buildings account for 50% of UK carbon
emissions
 Savings in the construction of new buildings
and to the upgrading of the existing stock can
therefore be significant
New Building Regulation L1
Draft regulatory impact assessment
Energy White Paper
 The plan is also for the future with a review
every 5 years
 Work has already commenced on the
proposals for 2010 to 2020
New Building Regulation L1
Draft regulatory impact assessment
Options
 Option 1 – Do nothing
 Option 2 – Information and Education
 Option 3 – Amending Part L of the Building
Regulations
New Building Regulation L1
Draft regulatory impact assessment
Preferred choice – Option 3
 Amending the Building Regulations
 Introducing other legislation to complete the
transposition of the other elements of the
EPBD - The Sustainable and Secure Buildings
Act
 Supportive training programme
New Building Regulation L1
Draft regulatory impact assessment
 Extra costs for dwellings are estimated as
being from £323 for flats to £1170 for a
detached dwelling
 Increased costs for commercial work are
estimated at £19/m² and £7/m² for industrial
buildings – these costs do not include
‘Consequential Improvements’
New Building Regulation L1
Draft ADL1A Work in new dwellings
 The new SAP 2005 will be the only way of
showing compliance
 Elemental and target U values will no longer be
permissible as ways of showing compliance
New Building Regulation L1
Draft ADL1A Work in new dwellings
 The new SAP will be a transparent calculation that will
remove the ability of designers and checkers to
interpret the guidance
 There will be minimum U values imposed to constrain
design opportunities
 Sample air pressure testing will be imposed in a
similar way to sound testing - major Housebuilder
objections!
 There may be a ‘Robust Option’ as an alternative to
the pressure testing regime
New Building Regulation L1
Draft ADL1A Work in new dwellings
The 5 criterion to showing compliance that will
need to be followed are
1.
Predicted carbon dioxide emission from
proposed dwelling does not exceed the target
New Building Regulation L1
Draft ADL1A Work in new dwellings
2.
The performance of the building fabric and
the heating, hot water and fixed lighting
systems should be no worse than the design
limits
3.
The dwelling has appropriate passive control
measures to limit solar gains
4.
The performance of the dwelling, as built, is
consistent with the Dwellings Emissions Rate
New Building Regulation L1
Section 2 – Draft ADL1A Work in new dwellings
5.
The necessary provisions for energy efficient
operation of the dwelling are put in place
New Building Regulation L1
Draft ADL1A Work in new dwellings
Limiting U Value standards (W/m²K)
Element
Area-weighted dwelling
average
Worst individual subelement
Wall
0.35
0.45
Floor
0.25
0.45
Roof
0.25
0.35
Windows, rooflights, doors
etc
2.2
3.3
New Building Regulation L1
Draft ADL1A Work in new dwellings
 The air pressure test standard will be set at 10m³/m²
per hour at 50 Pa
 There will be a honeymoon period for failure to meet
this standard until 31 October 2007
 Testing arrangements will be split into those using and
those not using accredited construction details
 Those that have adopted accredited construction
details - a pressure test should be carried out on each
dwelling type
New Building Regulation L1
Draft ADL1A Work in new dwellings
Dwellings that have not adopted accredited construction
details
Testing to be minimum of
a.
2 units of each dwelling type in the development
b.
5% of each dwelling type – can be reduced to 2% if
the testing was successful on the first 5 dwellings
tested
c.
The sample to concentrate in the earlier completed
dwellings of each type
New Building Regulation L1
Draft ADL1B Work in existing dwellings
 Type of work covered by the approved document
 Extensions
 Creating a new dwelling through a material change
of use
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Material alterations to existing dwellings
The provision of a controlled fitting
The provision or extension of a controlled service
The provision or renovation of a thermal element
New Building Regulation L1
Section 3 – Draft ADL1B Work in existing dwellings
Limiting U-value standards (W/m²°K) for small elements
Eg Metre box scenario
Element
Limiting U-value
Wall
0.70
Floor
0.70
Roof
0.35
Windows, Doors etc
3.30
New Building Regulation L1
Section 3 – Draft ADL1B Work in existing dwellings
Standards for thermal elements (W/m²°K)
Element
Standards for new elements
in an extension
Standards for replacement
elements in an existing
dwelling
Wall
0.30
0.35
Pitched roof – insulation at
ceiling level
0.16
0.16
Pitched roof – insulation
between rafters
0.20
0.20
Flat roof or roof with integral
insulation
0.20
0.25
Floors
0.22
0.25
New Building Regulation L1
Section 3 – Draft ADL1B Work in existing dwellings
 Window areas are restricted to 25% of the floor
area of the extension plus the area of any windows
or doors which, as a result of the extension works,
no longer exist or are no longer exposed
 Special options will be made to allow for
conservatory type extensions
New Building Regulation L1
Section 3 – Draft ADL1B Work in existing dwellings
 Replacement boilers to be of a condensing type or
traditional in some limited existing circumstances
 Guidance is given on solar heating systems
 Recommendations are made on water treatment in
heating systems in hard water areas
 Additional controls for high efficiency luminaires
New Building Regulation L1
Section 3 – Draft ADL1B Work in existing dwellings
Historic Buildings
Special considerations can apply to
 Listed buildings
 Buildings in a conservation area
 Buildings of local architectural or historic interest
 Buildings within National Parks, areas Outstanding
National Beauty and World Heritage sites
New Building Regulation L1
Draft ADL1B Work in existing dwellings
Renovation of thermal elements
 Where more than 25% of the surface area of a
thermal element is being renovated, a way of
showing compliance with the regulation would be
to upgrade the whole element in question
New Building Regulation L1
Section 4 – Draft ADL2A Work in new buildings other
than dwellings
 The proposal is to raise the overall standard of
energy performance by about 27%
 The elemental approach to design will no longer
be acceptable
 A nationally agreed methodology to achieve an
overall energy performance standard must be
adopted
New Building Regulation L1
Section 4 – Draft ADL2A Work in new buildings other
than dwellings
 The proposed methodology will be more flexible
and building specific - SBEM
 The flexibility in the methodology will be
constrained by a series of poorest acceptable
benchmarks
 The use of LZC heating systems are allowed for
and compensation for their use are within the
calculation method
New Building Regulation L1
Draft ADL2A Work in new buildings other than
dwellings
 The proposals make pressure testing a legal
requirement
New Building Regulation L1
Draft ADL2A Work in new buildings other than
dwellings
 New regulations will be drafted requiring
submission of certificates for the building and its
systems
 New regulations will be drafted requiring regular
inspection of air-conditioning systems and the
submission of reports
New Building Regulation L1
Draft ADL2A Work in new buildings other than
dwellings
 The calculation method for energy will a
comparative study against the notional building
 The carbon improvement in buildings will be up to
20% with a further 10% allowance if no LZC
energy systems are adopted
 The air pressure test standard remains at
10m³/m²h at 50 Pa
New Building Regulation L1
Draft ADL2A Work in new buildings other than
dwellings – Table 4, limiting U-value standards
Element
Area weighted average
value - U value W/m²K
For any individual element
– U value W/m²K
Wall
0.35
0.7
Floor
0.25
0.7
Roof
0.25
0.35
Windows* and rooflights
2.2
3.3
High usage entrance doors 6.0
6.0
Vehicle access
4.0
1.5
New Building Regulation L1
Draft ADL2A Work in new buildings other than
dwellings
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A failure to meet air permeability tests can be
made up for by re-examining the energy
standard calculation and making any necessary
adjustments
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There will be honeymoon period for the testing
of buildings under 1000m² until 31 October
2007.
New Building Regulation L1
Draft ADL2A Work in new buildings other than
dwellings
 As an alternative to air pressure testing on
buildings under 500m² an allowance of 15m³/m²h
at 50 Pa can be used in the energy calculation
method. Compensatory features can then be
installed
 Large, complex buildings may be subjected to an
alternative approach to air pressure testing
New Building Regulation L1
Draft ADL2A Work in new buildings other than
dwellings
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There will be a 5 step approach for compliance
applicable to new buildings
1.
Predicted carbon dioxide emissions from the
proposed building does not exceed the target
2.
3.
The performance of the building fabric and
the building services system should be no
worse than the design limits
The building has appropriate passive control
measures to limit solar gains
New Building Regulation L1
Draft ADL2A Work in new buildings other than
dwellings
4.
The performance of the building, as built, is
consistent with the Building Emission Rate
5.
Providing information
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
Types of work covered include;
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Consequential improvements
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An extension
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A material change of use
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A material alteration
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The provision or extension of a controlled service or fitting
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The provision or renovation of a controlled element
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
 Where the work involves the first fit-out of a ‘shell’
constructed under these guidelines the design
should be as if it were all ‘new-build’
 Allowances are made for ‘Historic buildings’
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
 Consequential Improvements - Regulation 17D.-(1)
applies to a building with a total useful floor area
over 1000m² where the building work includes an
extension, fixed building services or an increase to
the capacity of any fixed building services
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
 Where this regulation applies, such work, if any
shall be carried out to ensure that the building
complies with the requirements of Part L – see
Table 7 for trigger values
 The regulation does not require anything to be
done that is not technically, functionally and
economically feasible – this has been defined
New Building Regulation L1
Draft ADL2B Work in existing buildings other
than dwellings
Element
Threshold value
Improved value
Cavity wall
0.70
0.55
Other wall type
0.70
0.35
Floor
0.7
0.25
Pitched roof ceiling level
0.35
0.16
Pitched roof between rafters
0.35
0.2
Flat roof
0.35
0.25
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
Consequential improvements include;
 Where there is in increase in the installed capacity
of heating or cooling plant To upgrade any thermal element served by the plant
with increased capacity
To replace any existing window or door within the
area served by the plant with increased capacity
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
 There is no limit to the value of this work where
there is an increase in the installed capacity of the
plant, only that it must be cost effective – the 10%
capital value rule does not apply
 If the value of this work exceeds 10% then further
consequential improvements are not required
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
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In addition the 10% rule, based on the value of the principal
works, applies and requires certain other elements in addition
to those previously mentioned, to be upgraded including
Heating and cooling systems more than 15 years old need to be
upgraded or replaced
Inefficient lighting systems, to install energy metering
The provision of an LZC energy system as long as a 7 year
simple payback can be shown
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
 When carrying out a Material Change of Use
reasonable provision would be to include;
 Replacement windows
 Controlled upgrading of any renovated thermal
elements
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
 For extensions over 100m² and greater than 25%
of the existing building ADL2A should be adopted
– this currently includes air pressure tests
 For extensions less than 100m² alternative values
given below should be adopted
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
Element
Standard for new elements in
an extension
Standard for replacement
elements in an existing
building
Wall
0.30
0.35
Pitched roof – insulation at
ceiling level
0.16
0.16
Pitched roof – insulation
between rafters
0.20
0.20
Flat roof with integral
insulation
0.20
0.25
Floors
0.22
0.25
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
 Windows – see table below
 OR the ratio that is present in that part of the
existing building to which the extension is to be
joined
New Building Regulation L1
Draft ADL2B Work in existing buildings other than
dwellings
Building type
Windows and personnel
Rooflights as a % of the
doors as a % of the exposed area of the roof
wall
Residential buildings
30
20
Places of Assembly, offices
and shops
40
20
Industrial and storage
buildings
15
20
Vehicle access doors and
display windows
As required
N/A
New Building Regulation L1
The future
 Our proposed standards are still lower than some other
EU countries – e.g. Denmark and Switzerland
 Aspirational U values for 2010
Item
Indicative U value
Roof
0.1
Wall
0.2
Windows, doors etc
1.4
Floors
0.2
New Building Regulation L1
The future
 Air permeability standards are likely to be reduced to 5 or
7m³/m²h to bring us into line with standards currently in
operation in countries such as Germany and Holland
 It should be noted that in Switzerland the current
standard is set at 3.6 m³/m²h
New Building Regulation L1
Implementation
Transitional provisions
These have not yet been confirmed and we await
further advice from the ODPM
New Building Regulation L1
Any Questions?