Insulating Glass Units - The BWF€¦ · BS EN 1279 – The legal stuff IGUs are a construction...
Transcript of Insulating Glass Units - The BWF€¦ · BS EN 1279 – The legal stuff IGUs are a construction...
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Insulating Glass Units
Russell Day – GGF Technical Officer
A guide to Insulating Glass Units manufactured to BS EN 1279
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Agenda
What is an Insulating Glass Unit
BS EN 1279 series
The legal stuff
Types of IGUs
Glazing systems
Guarantees
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What is an Insulating Glass Unit
2 or more panes of glass separated by a spacer bar(s) around the perimeter of the glass
Spacer bar is usually attached to the glass by a primary sealant
Secondary sealant behind the spacer bar
Cavity formed may be air or inert gas filled
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The Glass Glass specification
a single function such as light transmission (e.g. float glass or low-iron glass) or
additional functions
safety in the event of breakage,
containment,
energy efficiency (low emissivity),
solar control,
reduced maintenance (cleaning),
security,
acoustic or
a combination of functions
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The Glass With the exception of thermal toughening,
most other additional functions will affect the light transmission of the glass
This may affect the g-value, a significant component of the Window Energy Rating calculations
Many of these functions also have a effect of the optical characteristics of the IGU
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The Spacer Bar
Is used to control the width of the cavity
May be either standard bar (usually aluminium) or Warm-edge type
Contains desiccant to dry the air or gas in the cavity to prevent the formation of condensation
Volume is critical in hollow spacer bars
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Primary sealant
Primary sealant is applied to the 2 edges of the spacer bar to provide adhesion of the spacer to the glass
To prevent moisture ingress into and gas loss from the cavity
Provides structural strength to the IGU
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Secondary sealant
Applied to the IGU following assembly of the unit
Provides additional resistance to moisture ingress and gas loss
Provides structural strength to the IGU
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The Cavity
Controlled width dependant on the thermal performance required
May be air filled or gas filled to improve thermal performance (Argon, Krypton, Xenon)
Optimum cavity width depends on cavity contents, air 18-20mm, argon 16mm etc.
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IGU components
Key
1 Desiccant
2 Spacer bar
3 Diffusion openings
4 Glass
5 Inner/Primary seal
6 Outer/Secondary seal
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BS EN 1279
6 parts:
Part 1 - Generalities, dimensional tolerances
and rules for the system description
Part 2 - Long term test method and
requirements for moisture penetration
Part 3 - Long term test method and
requirements for gas leakage rate and for gas concentration tolerances
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BS EN 1279
Part 4 - Methods of test for the physical
attributes of edge seals
Part 5 - Evaluation of conformity
Part 6 - Factory production control (FPC) and
periodic tests
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BS EN 1279 – The legal stuff IGUs are a construction product - CPR
BS EN 1279 is a harmonised European Standard (Norm) hEN
All IGUs should be manufactured in conformity to the standard (all parts)
All IGUs should have a Declaration of Performance (Essential Characteristics)
All IGUs should be CE marked
No exceptions
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Declaration of Performance Declaration of Performance
No: 001
4-20-4 IGU – Low-e + 90%argon+toughened
For use in commercial and domestic buildings
ABC Insulating Glass Ltd.
Unit 26
Northampton Business park
Northampton
www.abcig.co.uk/dop
System 3
EN 1279-5:2005+A2:2010
Notified body 1234
Essential Characteristics Performance
Resistance to fire (for glass for use in a glazed assembly intended specifically for fire resistance) NPD
Reaction to fire NPD
External fire performance (for roof coverings only) NPD
Bullet resistance: Shatter properties and resistance to attack NPD
Explosion resistance: Impact behaviour and resistance to attack NPD
Burglar resistance: Shatter properties and resistance to attack NPD
Pendulum body impact resistance: Shatter properties (safe breakability) and resistance to impact 1(C)1
Mechanical resistance: Resistance against sudden temperature changes and temperature differentials 200°C
Mechanical resistance: resistance against wind, snow, permanent and imposed and/or imposed loads of the glass unit and edge seal when required 4mm as ordered
Protection against noise: Direct airborne sound reduction NPD
Thermal properties 1.2 W(m2.K)
Light transmittance NPD
Light Reflectance NPD
Direct solar transmittance NPD
Direct solar reflectance NPD
Total solar factor (g-value) 0.72
Dangerous substances NONE
The performance of the product identified above is in conformity with the set of declared performance(s). This declaration of performance is issued in accordance with Regulation (EU) No. 305/2011, under the sole responsibility of the manufacturer identified above
Signed on behalf of the manufacturer by:
J. M. Samuels Northampton on 21/02/2015
[Signature]
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CE Label
No: 001
For use in commercial and domestic buildings ABC Insulating Glass Ltd.
Unit 26 Northampton Business Park
Northampton
15
4-20-4 IGU – Low-e + 90%argon+toughened
EN 1279-5:2005+A2:2010
Notified body 1234
System 3
Resistance to fire (for glass for use in a glazed assembly intended specifically for fire resistance) NPD
Reaction to fire NPD
External fire performance (for roof coverings only) NPD
Bullet resistance: Shatter properties and resistance to attack NPD
Explosion resistance: Impact behaviour and resistance to attack NPD
Burglar resistance: Shatter properties and resistance to attack NPD
Pendulum body impact resistance: Shatter properties (safe breakability) and resistance to impact 1(C)1
Mechanical resistance: Resistance against sudden temperature changes and temperature differentials 200°C
Mechanical resistance: resistance against wind, snow, permanent and imposed and/or imposed loads of the glass unitand edge seal when required
4mm as ordered
Protection against noise: Direct airborne sound reduction NPD
Thermal properties 1.2 W(m2.K)
Light transmittance NPD
Light Reflectance NPD
Direct solar transmittance NPD
Direct solar reflectance NPD
Total solar factor (g-value) 0.72
Dangerous substances NONE
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Types of IGUs
Double glass IGUs
Most commonly used
16 – 20mm cavity widths
Edge seal sightline usually 10 – 12mm
4 – 8mm cavity widths
Reduced edge seal sightline 6 – 8mm
Triple Glass IGUs
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Double glass IGUs
IGUs with edge seal sightline of 10–12mm
Test data from Part 2 & 3 testing
All cavity widths valid when tested with 12mm cavity
Narrow cavities (4, 6 & 8mm) need to increase amount of desiccant when using hollow spacer bars
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Double glass IGUs IGUs with edge seal sightline of 6-8mm
Achieved by:
Significant reduction in secondary sealant depth
10-12mm sightline Part 2 & 3 test data no longer valid, actual test data for unit construction needed
Reduction in depth of spacer bar
Possible reduction in ratio of desiccant volume to the cavity volume
GGF - Narrow Cavity Insulating Glass Units (IGU’s)
with Reduced Spacer-bar Sightlines
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GGF Guidance
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Triple glass IGUs
Beware of claims made
Thermal
Acoustic
Hardware weight capacity
Thermally toughened centre pane
Visual quality – more panes of glass
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Glazing systems
Drained and ventilated systems
Ideal for IGUs
System is designed to remove moisture from the glazing rebate
keeps moisture away from edge seals
Majority are usually ‘dry-glazed’, with gaskets or tapes
no contact of glazing materials with edge seal
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Compatibility of glazing compounds
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Glazing systems
Solid bedding
Used mainly in timber frames
System must be designed to prevent moisture entering into the glazing rebate and contacting the IGU edge seal
Compatibility of the glazing compound with the IGU edge seal is vitally important
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Glazing systems – reduced sightline IGUs
Solid Bedding is used exclusively for narrow module, reduced sightline IGUs
Use the system recommended by the IGU manufacturer (Guarantee)
Often used in situations where ‘Putty fronting’ is also specified
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Glazing systems – reduced sightline IGUs
Slimlite Double Glazing B66/Putty
UA Sashlite U9/Colouglaze or DrysealMP
The Original Glass Company B66/U9/DrysealMP
Slenderpane B66/Putty
Action Glass (UK) Ltd (Slenderfit) None Stated
Timbalite None Stated
Treforest Glass U9/Colouglaze
Abbey Glass (Cardiff) Limited Putty
Windowright Flexistrip / U9
Ravensby Glass Co Ltd Non setting compound/Elastic putty sealant
Slimglaze B66/U9/Multipurpose Putty
Histoglass KAWO Elastokitt
Nichols and Clarke Bedding Compound/ non linseed putty
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Glazing systems
Standard putty is not suitable for use as back bedding or void filling (between edge of IGU and frame rebate)
If ‘putty fronting’ is required, ideally a ‘modern’ material should be used
If general purpose putty is used, overpainting is essential – do not use MVP finishes
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Guarantees
When purchasing IGUs ensure the manufacturer supplies a guarantee with the unit
Often different when factory or site glazing
Guarantees will have conditions attached, ensure you are aware of them
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Thank you for your attention
Any Questions?
Russell Day, Technical Officer
Glass and Glazing Federation