Upvc Installations - Technical Specifications

Window Energy Ratings (WERs)

Allow consumers to rapidly compare the energy efficiency of competing products
Allow specifiers to select windows based on a validated performance figure.
Allow legislators and others to ensure that fitted windows meet the legal
requirements.
Low maintenance
Allow energy agencies to direct support to energy efficient products.Adds value
to your home
Provide a method to link thermal window performance to other thermal assessment
systems.

Round the Clock window systems are capable of achieving ‘A’ to ‘C’ ratings depending upon window configuration and glass type

'U' Values

'U' values are now also part of the latest Building Regulations which come into effect on 1st October 2010, where it is stated that any installed window must be a 'C' rating under the WERs or have a 'U' value of 1.6. 'U' values are widely used across Europe as a means to assess the thermal performance of building products and this includes the UK new build and refurbishment markets

Pilkington K Glass™

The UK's leading solution for thermal insulation in homes and public buildings, Pilkington K Glass™ is a low emissivity coated glass which is easily stocked, processed and installed. Pilkington K Glass™ has been established for more than 15 years making it the trusted solution for meeting energy efficiency Building Regulations.

How it works
The glass in your windows absorbs heat then radiates it again on the colder, outside, surface. Pilkington K Glass™ has a so-called low emissivity coating which is positioned on surface 3 (counting from the outside) of the Insulating Glass Unit (IGU).

The low emissivity coating is a poor radiator of heat. So the heat absorbed by the coated glass does not travel across the air gap to the outer pane and the cold outside world. Instead the coating reflects the heat back into the room. Windows incorporating Pilkington K Glass™ allow heat from the sun through and keep heat inside, making it easier and more cost effective to keep buildings warm.

K glass consumer leaflet
K glass data sheet