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Building Regulations and Window Energy Ratings

Unglazed Frames

6) WER simulation requirements

Installers may wish to declare up to three insulated glass unit simulations detailing components that will give them a ‘C’, ‘B’ or ‘A’, 'A+' or 'A*' WER. Specifications for each will be required to include details of:
• Outer pane glass
• Inner pane glass
• Mid pane glass (for triple glazed units)
• Cavity dimensions
• Cavity gas
• Spacer bar
• Primary sealant
• Secondary sealant
• Secondary sealant depth

Building Regulations and WERs Page 12

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