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

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  Glazing systems  Guarantees Sponsored by

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 Sponsored by

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 Sponsored by

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 Sponsored by

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 Sponsored by

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 Sponsored by

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 Sponsored by

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. Sponsored by

IGU components Key 1 Desiccant 2 Spacer bar 3 Diffusion openings 4 Glass 5 Inner/Primary seal 6 Outer/Secondary seal Sponsored by

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 Sponsored by

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 Sponsored by

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 Sponsored by

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 NPD 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 1(C)1 Pendulum body impact resistance: Shatter properties (safe breakability) and resistance to impact 200°C Mechanical resistance: Resistance against sudden temperature changes and temperature differentials 4mm as ordered Mechanical resistance: resistance against wind, snow, permanent and imposed and/or imposed loads of the glass unit and edge seal when required NPD Protection against noise: Direct airborne sound reduction 1.2 W(m 2 .K) Thermal properties NPD Light transmittance NPD Light Reflectance NPD Direct solar transmittance NPD Direct solar reflectance 0.72 Total solar factor (g-value) NONE Dangerous substances 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] Sponsored by

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 4mm as ordered when required Protection against noise: Direct airborne sound reduction NPD 1.2 W(m 2 .K) Thermal properties Light transmittance NPD Light Reflectance NPD Direct solar transmittance NPD Direct solar reflectance NPD Total solar factor (g-value) 0.72 Dangerous substances NONE Sponsored by

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 Sponsored by

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 Sponsored by

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 Sponsored by

GGF Guidance Sponsored by

Triple glass IGUs  Beware of claims made  Thermal  Acoustic  Hardware weight capacity  Thermally toughened centre pane  Visual quality – more panes of glass Sponsored by

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 Sponsored by

Compatibility of glazing compounds Sponsored by

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 Sponsored by

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 Sponsored by

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 Sponsored by

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 Sponsored by

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 Sponsored by