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Part L (2022) Compliance – All Products

Residential Replacement – Glazing Requirements
Overall U-Value of 1.4W/m²K or Energy Rating of B (windows) & C (glazed doors)

Product

Regulation Requirements

OW-70

For U-Value compliance a Glass Centre Pane of 1.1W/m²K or better is required

For WER ‘A’ use 28mm Float/Argon/Planitherm Total + with warm edge spacer*
(WER ‘B’ if using OW70 Long Leg on all four sides)

OW-80

For U-Value compliance a Glass Centre Pane of 1.2W/m²K or better is required

For WER ‘A’ use 28mm Float/Argon/Planitherm Total + with warm edge spacer*

OB-49

For U-Value compliance a Glass Centre Pane of 1.1W/m²K or better is required

For DER ‘B’ use 28mm Float/Argon/Planitherm Total + with warm edge spacer*

OB-72

For U-Value compliance a Glass Centre Pane of 1.1W/m²K or better is required

For DER ‘B’ use 28mm Float/Argon/Planitherm Total + with warm edge spacer*

OS-29,44,77

For U-Value compliance a Glass Centre Pane of 0.8W/m²K is required

For DER ‘C’ use 28mm Float/Argon/Planitherm Total + with warm edge spacer*

OS-20

Complies to an overall U-Value of 1.4W/m²K with Glass supplied by Origin

A DER ‘A’ is available with Glass supplied by Origin if required

*Alternative Glass Specifications

Guardian Ultra Clear/Argon/Climaguard A

Pilkington Optiwhite/Argon/K Glass S

AGC Clear Vision/Argon/Planibel AS