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Pilkington United Kingdom - General FAQ

Read frequently asked questions available from Pilkington:

What is the U Value of a typical unit?

Heat loss is normally measured by the thermal transmittance or U value, usually expressed in W/m2K. In its most basic terms, the lower the U value, the greater the thermal insulation.

Which glass would I need to use to give me 30-min integrity or integrity and insulation?

The Pilkington Specifire incorporates all the information you need to choose the right product for your application. By answering a series of questions you are taken to a screen highlighting the product, its properties and performance and details of its fire testing pedigree. The disc also incorporates copies of all Pilkington’s fire test summaries and details of compatible sealant materials.

What glass would need to be specified for a conservatory south facing and also incorporating Pilkington K Glass™ in the double glazed unit?

The Pilkington Optifloat™ Tinted (formerly known as Pilkington Antisun™) range has long been an industry standard for low-to-medium performance glass with the Pilkington Suncool™ range suiting high performance needs. The Pilkington Eclipse Advantage™ range fits between the two.

To maximise the reduction of solar gain, the ideal position for a solar control glass (e.g. Pilkington Optifloat™ Tinted) in a double glazing unit is the outer pane. Pilkington K Glass™ is not a solar control glass: however, its presence in a double glazing unit can considerably improve its thermal insulation (reduce the U-Value) over conventional units. The ideal position for the Pilkington K Glass™ low emissivity coating is on the inner pane facing the cavity. Hence, if the requirements are for reduced solar gain and improved thermal insulation, both types of glass can be combined in one unit. Both Pilkington K Glass™ and Pilkington Optifloat™ Tinted are available in toughened and laminated form.

Better insulation and no cold spots near windows make Pilkington K Glass™ an excellent choice for conservatories, because thanks to a special low emissivity coating on the surface of the glass, it let's the sun's rays through, but reflects heat from fires and radiators back into your home - heat which ordinary double gazing allows to escape. In fact it will typically keep an unheated conservatory much more comfortable for a greater part of the year than ordinary double glazing, allowing the occupier to make the most of the conservatory all year round. The effect of suppressing the insulating properties of Pilkington K Glass™ double glazing.

This in turn has the knock on effect of not only lowering household bills, but also helps the environment by reducing the amount of heating needed to keep a house warm. Safety and security issues can also be tackled, as insulating units incorporating Pilkington K Glass™ can be manufactured in both toughened and laminated forms.

An attractive addition to any home, a conservatory requires a lot of hard work in order for it to look great all year round. Self-cleaning glass is the ultimate solution for conservatory owners. A glass roof is a striking feature but must be well maintained in order for it to fulfil its purpose. Pilkington Activ™ Blue and Pilkington Activ™ Neutral were designed with conservatories in mind and are the perfect self-cleaning and solar control solutions for glass roofs.

What is the standard thickness of glass for a shop front of X size of double glazed unit?

Generally, display windows (including shop fronts) are exempt from the requirements of Part L of the building regulations and as such are usually glazed with a single pane. The specification of an appropriate glass for shop front applications may depend upon a number of factors, including the size of the pane, how it's supported and the design wind load.

What does integrity and insulation mean?

Both relate to fire resistant glazing:

Integrity: Is defined in BS 476: Part 20: 1987 as, "The ability of a specimen of a separating element to contain a fire to specified criteria of collapse, freedom from holes, cracks and fissures and sustained flaming on the unexposed face.

Insulation: Is defined in BS 476: Part 20: 1987 as, "The ability of a specimen of a separating element to restrict the temperature rise of the unexposed face to below specified levels". This requires, in a test, that the unexposed face rises on average by no more than 140°C and in any single position by no more than 180°C.

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