Insulating Glass Units Russell Day GGF Technical Officer A guide to - - PowerPoint PPT Presentation

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Insulating Glass Units Russell Day GGF Technical Officer A guide to - - PowerPoint PPT Presentation

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Insulating Glass Units Russell Day GGF Technical Officer A guide to Insulating Glass Units manufactured to BS EN 1279 Sponsored by Agenda What is an Insulating Glass Unit BS EN 1279 series The legal stuff Types of IGUs

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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
  • f 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
  • f 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

  • n 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
  • r 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

  • f IGU and frame rebate)
  • If ‘putty fronting’ is required, ideally a

‘modern’ material should be used

  • If general purpose putty is used,
  • verpainting 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 rday@ggf.org.uk