Sto Ltd I External Wall Insulation Systems

Sto Ltd I External Wall Insulation Systems
External Wall Insulation Systems
Introduction
Introduction
What is an External Wall Insulation System?
Why insulate?
Benefits
Summary
Questions
Project:
Imperial War Museum North
Manchester
Architect:
Studio Libeskind
Product:
StoVentecrainscreen cladding
and StoRend Flex systems
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Introduction - Learning Objectives
Understand what constitutes an External Wall Insulation
System.
Understand the different systems available and the criteria
for correct selection.
Learn the benefits for all parties of designing buildings with
External Wall Insulation systems.
What this means for Passive House construction
Projects:
Crescent House (top)
Skywood House (below)
Architect:
Foster & Partners
Product:
StoTherm Classic
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Introduction - About Sto
Sto aims to develop innovative, ecologically-sound products to
maintain and enhance the value of buildings in accordance with
our mission statement ‘Building with Conscience’.
1835 - a lime quarry to today’s international organisation with a
turnover of 681million Euros.
m2
Over 310 million
worldwide.
Sto has an extensive range of products for inside and out
including acoustic ceilings, paints, internal plasters, renders and
external wall insulation systems.
Quality certification in accordance with DIN EN ISO 9001.
Environmental certification of Sto AG in accordance with DIN EN
ISO14001.
Project:
Sto Hamburg
Project:
Sto Weizen
of Sto external wall insulation systems
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Introduction - About Sto
Patent statistics 2006
(European patent databank INPADOC)
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Why insulate?
What’s the problem?
I’m worried about
this global warming
We don’t all see it from
the same viewpoint...
Yes, but this is the
Antarctic!
At least we’re
getting better
weather
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Why insulate?
What’s the problem?
Mankind has always been able
to adapt to conditions…..
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Why insulate?
Perceived Values
Home heating
Don't know
3%
Electricity
Home heating
26%
Personal
transport
14%
What’s the problem?
Water heating
Personal transport
Don't know
Actual Values
Water heating
18%
Electricity
39%
Home heating
Electricity
Water heating
Home heating
53%
Personal
transport
31%
Water heating
8%
Electricity
8%
Personal transport
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Why insulate?
What’s the problem?
Peak oil
Rising demand
Price explosion
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Why insulate?
What’s the problem?
Oil price development 1960 - 2006
© Tecson www.tecson.de
Nominal price
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Why insulate?
What might we achieve?
Compliance with legislation
Cost savings
Increased indoor comfort
Climate change prevention
Reduction of air pollution
Conservation of limited resources
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Why insulate the walls?
6
Basement
7
Roofs
Window ventilation
17
Window conduction
30
Wall
40
0
10
20
30
40
% of total thermal loss
50
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Why insulate with EWI?
To save energy/natural resources
Requirements of Part L and Part J are achieved/surpassed
Provide weather protection
Eliminate condensation
Allow greater design freedom
Colour
Form
Texture
Eliminate building grids, i.e. curtain-walling, dimensional restrictions of brickwork.
Help stop material stress due to thermal movement
Projects: Passive House Ottbergen, Germany
U value: 0,127W/m2K
EWI: StoThem Classic 300mm insulatioin
Active heating: None
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What is EWI? - System components
1
1
A load-bearing construction (the substrate)
Brickwork/Blockwork
Metal or timber-framed,clad construction
Concrete
Existing render
2
3
4
5
Adhesive or
Mechanically fixed track system
Insulation - Expanded polystyrene, Mineral fibre and others
Reinforcing layer with glass-fibre mesh
Decorative finish
All components must be compatible with each other
2
3
4
5
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Why Insulate externally?
Analysis of temperature curves
Internal Insulation
Cavity Wall Insulation
External Insulation
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Why Insulate externally?
Public enemy No. 1 - Condensation
The dew point
the point where condensation starts
in the wall
it depends on
– temperature
– humidity
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Why Insulate externally?
Condensation - humidity saturation
1 m³ air
1 m³ air
20°C, 100%
0°C, 100%
17.3 g
4.8 g
12.5 g condensation
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Condensation Risk and Location
Common Cavity Wall - uninsulated
102.5mm Brick
50mm Cavity
Interface temperature
Dewpoint temperature
100mm Block
12mm Plaster
The wall is ‘healthy’ with no
theoretical condensation risk but
will fall well short of current
regulation requirements for
thermal performance.
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Condensation Risk and Location
Common Cavity Wall - cavity filled
Interface temperature
Dewpoint temperature
Potential condensation risk
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Condensation Risk and Location
Common Cavity Wall with insulated
dry-lining
Interface temperature
Dewpoint temperature
Potential condensation risk
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Condensation Risk and Location
Common Cavity Wall – externally insulated
Interface Temperature
Dewpoint temperature
‘U’ Value is enhanced as
wall is now warm and dry
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Condensation Risk and Location
Single Leaf – externally insulated
Interface Temperature
Dewpoint temperature
‘U’ Value is enhanced as wall is
now warm and dry throughout
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Substrate choice - Single-leaf construction
Single-leaf construction uses a monolithic, load-bearing wall
with no cavity. Generally constructed using brick or concrete
block. Insulated externally.
Benefits:
Fast construction
Wall acts as a heat store to minimise temperature fluctuation (dense
construction)
Excellent acoustic properties from the mass of supporting wall
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Substrate choice - Metal or timber framed-construction
Framed construction of timber or light gauge metal, either site
built or pre-fabricated.
Benefits:
Extremely fast construction
Cost effective
Little site storage space required for materials
Wall construction is “dry” until application of finish
(independent of weather)
Due to dry construction the U value is achieved immediately
Light-weight (load)
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Substrate - Refurbishment of existing construction
Any existing external envelope that needs thermally or optically
upgrading.
Benefits:
No disruption to occupants (i.e. with dry lining)
Cost effective
(Almost) limitless U value is possible
Complete change of appearance is possible
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Insulation - EPS or Mineral Fibre Insulation?
EPS 15 SE, FRE, rigid, CFC/HCFC-free
Benefits:
Completely synthetic system
Lightweight
Competitively priced
Easy to form complex shapes and rebates
Possible to rasp the surface level
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Insulation - EPS or Mineral Fibre Insulation
Mineral fibre board
Mineral fibre slab (140kg/m3 high density):
Lamella (90kg/m3 lamella):
Benefits:
Vapour permeable
Good fire resistance
Some acoustic benefit
Fibres run parallel to wall
Fibres run perpendicular
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EWI - Reinforcing coats
Mineral or Synthetic?
Mineral:
Cement or lime based
Curing by hydration
Sack material requires water, once added application time is short
Impact mineral
Synthetic
Acrylic based in suspension of water
Pre-mixed pails, Drying by evaporation
High flexural strength
High impact strength
Impact synthetic
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EWI - Reinforcing mesh
Standard Mesh helps:
Give flexibility to the system
Improves impact-resistance
Improves strength of the system
Armour Mesh:
Is used in addition to standard mesh, particularly up to 2.5 m in
height to provide extra strength and impact resistance
Innovative StoShield AES Mesh
Helps to reduce electromagnetic radiation from wireless
technology by up to 99%
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Decorative Finishes - Renders
Mineral, Silicate, Silicone, Synthetic Renders
Mineral: cement or lime based
Good vapour permeability,cheap, little flexural strength,limited
colours, prone to efflorescence,
Silicate: water glass binder
Good vapour permeability,pre-mixed, little flexural strength, limited
colours, risk of efflorescence
Silicone: silicone binder, good vapour permeability, pre-mixed,
relatively good flexural strength, limited colours.
Best water repellence.
Synthetic: acrylic bound, excellent flexural strength, deep bright
colours possible, pre-mixed
Project: Marlborough House, Nottingham
Architect: Marsh & Grochowski
Project: National University of Ireland, Kildare
Architect: Moloney O’Beirne
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High Performance Render
What functions do renders have to perform?
Moisture:
Sunlight:
Cold, heat:
Wind (load):
Chemical:
Biological corrosion:
Mechanical:
Rain, snow
UV
Contraction/expansion
Bond to substrate
Pollution
Fungus,algae, mildew
Vandalism
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Performance of Decorative Render Finishes
Binder:
Lime
Cement
Silicate
Acrylic
Resin
Silicone
Resin
Adhesion
Water Repellency
X
X
Crack Resistance
X
X
X
Weather
Protection
Durability
Algae Resistance
X
Properties:
Vapour
Permeability
Key:
= Excellent,
= Good, = Adequate, x = Poor
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Alternative Decorative Finishes
Decorative Profiles:
StoDeco Profiles are made from 96% recycled materials (ash)
Helps to add relief and 3D to the external envelope
Lightweight and affixed using adhesive for easy application
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The Importance of Detailing
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The Importance of Detailing
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The Importance of Detailing
Flashings and Copings - Their effect on the facade
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CO2- Emissions
The UK government, in its White Paper
4,000
litres
8.75 million
Oil tanks
of 2003 has committed to the C60
Carbon Challenge: reducing total CO2
output by 60% by 2050.
Thanks
28,000 litres
1.25 million
fuel lorries
to Sto façade insulation systems
installed worldwide since 1964, 35 billion
litres of heating oil has not been burned equivalent to1.25 million fuel tanker
lorries. Placed end to end they would
reach half way round the world.
Sto
25,000,000 litres
1,400
Oil tankers
products have cut emissions of CO2
during this same period by more than 110
million tonnes.
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The Benefits - Aesthetics (Form)
Facade surfaces are not limited to usual grids
Externally insulated rendered surfaces can create beautifully seamless facades
Curves are easily achieved using EWI rendered surfaces
Form can be accentuated easily using colour and or decorative profiles
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The Benefits - Aesthetics (Colour)
Using synthetic finishes, 800 standard colours available
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The Benefits - Aesthetics (Texture)
Render grain sizes from 1.5 - 6mm available in various textures
Ceramic application is possible
Brickslips can be produced in any of the synthetic render colours
Texture changes are easy to apply.
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The Benefits - Longevity
Prolonging the working life of buildings
Durability is also ecological
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The Benefits - Minimal Maintenance
Intervals between maintenance cycles
extended
Through-coloured render so less frequent
over-painting
Seamless façade eliminates the need for
sealant replacement
BBA assessment - minimum 30yrs. life
expectancy
60 year Fraunhofer report
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The Benefits - Refurbishment
Protection characteristics
Material authenticity for renovation
Minimal disruption
Improved thermal performance
Maintains living space for improved
rentability
Project: Stanhope Gardens, Kensington, London Refurbishment of Grade II listed building
Architect: Chassy & Last
Product: StoTherm Classic, StoDeco Profiles
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Summary
Well insulated properties
Improved user comfort
Complete design freedom colours, textures
Minimal maintenance
Environmentally-friendly,
sustainable buildings
Sto factory Weizen
Architect Michael Wilford
The Passive House
The Passive House
The Passive House
Cold bridge elimination
The Passive House
Hannover
Renovation of existing
building to Passive House
standards
Architect: Dipl.Ing. Helmut
Wein
The Passive House
Construction:
150mm Masonry with300mm EWI
Energy value:
qH: 11.1 kWh/(m²a)
Extras: 8 m² StoSolar
EFH in Otterbergen
Built: 1999
Floor area: 323 m²
The Passive House
Construction:
Concrete blockwork with 400 mm EWI
partial timber frame + EWI
Sophienhof in Frankfurt
Built: 2006
The Passive House
Darmstadt-Kranichstein
The Passive House
External wall construction
Low tech
©BBC
The Passive House
External wall construction
Hi tech
©Passivehouse Solutions Ltd / va-Q-tec AG
The Passive House
Vacuum insulation
Technical Data:
λR < 0,004 W/mK at 1 mbar
• λR < 0,020 W/mK at atmospheric pressure
• Density: 150-300 kg/m³
• Thermal stability: -50°C < T < 80°C
The Passive House
Vacuum insulation
Petrisberg-Trier
The Passive House
with External Wall Insulation
Tried and tested
Complete design freedom colours, textures
Suitable for all building types
Environmentally-friendly,
sustainable buildings
Sto External Wall Insulation Systems
Thank You!