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Existing Buildings

Renovating, extending & problem solving
by

Matthew Crowther

on 30 June 2014

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Transcript of Existing Buildings

Renovated Thermal Elements
Cladding, rendering or dry-lining
Stripping down to expose basic structure
Replacing the water proof membrane on a flat roof

50 percent of the individual
element or 25 percent of
the total building envelope

Retained Thermal Elements

Part of a building subject to material change
of use or an existing element becomes part of
the thermal envelope

New and Replaced Thermal Elements
Newly constructed
such as an extension
or construction of
replacements for
existing elements
Controlled Fittings Controlled Services
Highly Glazed Extensions and Design Flexibility

More glazing than 25 percent of the extensions
floor area plus any opening that it covers

Compliance using SAP2009

Proposed DER <= Notional DER = PASS
Orientation of windows and solar gains
Notional windows divided equally around extension
Incorporate improvements to existing property to offset emissions
Benefit from log burners and/or new boilers
Existing Buildings
Renovating, Converting & Extending

80% reduction in CO2 by 2050
Royal Commission on Environmental Pollution 2007
Changes from 2010 to 2013

No change to fabric U-Values
No change to calculation methodology
May be dropping Consequential Improvements for domestic properties
2010 Part L1B
Summary of Schedule 1

Limiting heat gains and losses
Through building fabric
From pipes, ducts and hot water cylinders

Providing fixed building services that are
Energy efficient and commissioned

Provide to the owner sufficient information
About the building, the fixed building services and their maintenance requirements

Double brick wall
Timber batts
60mm Rigid Insulation
conductivity = 0.022 W/m.K

12.5mm Plasterboard
U-Value
0.30 W/m2K

External or Internal
Insulation

U-Value Example
U-Value
2.05 W/m2K

Pitched Roof
Insulation at Rafter

U-Value Example
U-Value
1.65 W/m2K

200mm rafters
150mm rigid
insulation
between rafters
conductivity =
0.022 W/m.K

12.5mm
plasterboard

U-Value
0.18 W/m2K
U-Value
1.65 W/m2K

100mm Rafters
50mm rigid
insulation
between rafters
conductivity =
0.022 W/m.K
65mm rigid
insulation
below rafters
conductivity =
0.022 W/m.K
12.5mm
plasterboard

U-Value
0.18 W/m2K

Cavity Wall
Insulation

U-Value Example
100mm brick
100mm cavity
insulation
conductivity =
0.034 W/m.K
100mm light
block
conductivity =
0.190 W/m.K
Plaster dabs
12.5mm
Plasterboard
U-Value
0.28 W/m2K

Heating and hot water systems
Hot water cylinders
Mechanical ventilation
Mechanical cooling/air con’
Fixed internal lighting
Fixed external lighting
Renewable energy systems

Windows, roof windows and roof lights:
whole window u-value 1.6 W/m2.K
or a centre pane u-value of 1.2 W/m2.K

Doors with < 50% glazing and other doors u-value 1.8 W/m2.K

If a window is enlarged total openings should not exceed 25 percent of the total floor area
Consequential Improvements
Nearly always for commercial buildings

Applicable to existing buildings with a total floor
area of over 1,000 m2

Very few domestic
buildings in The UK
10 per cent of the value of the principle works
should be spent on improvements

Upgrading heating, cooling and/or air handling services
Upgrading lighting less efficient than 40 lumens/watt serving area greater than 100 m2
Upgrade thermal elements and/or controlled fittings
Incorporating or increasing low zero carbon technologies
This needs to be done where work consists of:
an extension
Initial provision of any fixed building services (other than renewable technologies)
An increase to the installed capacity of any fixed building service (other than renewable technologies)

Only a small number of dwellings will fall under this
category

Any that do need to be assessed under Part L2B
Highly Glazed Extension
Example

Proposed Extension
Existing openings
Allowable glazing
Existing openings
+
25% floor area
Notional DER
43
Notional DER
43
Proposed DER
52
DER is measured in kgCO2/yr/m2
Building Regulations
U-Values
Notional DER
43
Proposed DER
37
Notional DER
43
Proposed DER
42
Proposed DER
52
Improving existing loft insulation
-15 kgCO2/yr/m2
Improving existing boiler
-10 kgCO2/yr/m2
Within Reason
Economic feasibility
Payback 15 years or less
Reports can be done to establish what is feasible

Technically and functionally feasible
Causes health and safety risks
Restricts access

High Proportion
Commercial Extension

Commercial building with extensions that are
more than 100m2 and is more than 25% of the
total floor area of the existing building is
assessed as a new build property under
part L2A!
Air test will be needed
Must meet Target Emission Rates
Build extensions under 100m2 or less than 25%

of existing buildings total floor area


Design Flexibility and Reporting
Using SAP2009

Highly glazed extensions that fail DER < DER

Complex buildings with different elements
Unable to achieve minimum u-values

High costs
Notional DER
33.81
Solid Feature Walls
Notional DER
33.81
DER Increase
4.3
Proposed DER
38.11

DER < DER Fail
Improve U-Values
Beyond Building Regulations
Notional DER
33.81
DER Saving
4.3
Proposed DER
33.81

DER < DER Pass
Service Upgrades
HETAS Approved Wood Log Burner
Additional Heating Controls
(Enhanced Load or Weather Compensator)
Notional DER
33.81
DER Saving
4.59
Proposed DER
33.52

DER < DER Pass
U-Value = 0.11
U-Value = 0.16
Improve U-Values
Beyond Building Regulations
U-Value = 0.16
U-Value = 0.14
Windows and Doors
U-Value = 1.20
U-Value = 0.18
Approved Document L1B provides guidance on an approach that offers more design flexibility.

SAP can be used to demonstrate that the total CO2 emissions for the building will become no greater than if each dwelling was improved following the guidance in paragraph Part L1B.
Contents
Summary of 2010/13 Part L1B
Building Regulations
Part L1B U-Values for
retained elements
U-Value = 0.16
U-Value = 0.28
Building Regulations
Part L1B U-Values for
new elements
U-Value = 0.30
U-Value = 0.18
Windows
U-Value = 1.60
Doors
U-Value = 1.80
U-Value = 0.25
Summary of 2010/13 Part L1B
Renovation, Retained and New Elements
Controlled Fittings and Services
Consequential Improvements
Highly Glazed Extensions and Design Flexibility
Full transcript