Reminder of how Document L will affect glass requirements when in force June 15th 2022

Changes to document L coming into force on 15th June 2022

Replacement window suppliers/installers' new performance requirements:

• The whole window's U-values (Frame and glass) are to be 1.4W/m2.K

or

• WER of ‘B’ or higher.

Solution:

• IGU to incorporate low e glass (generally soft coat such as Planitherm Total + FG)
• The spacer bar is to have a warm edge – aluminium will no longer meet the requirements.
• Argon gas filling

This is virtually the ‘standard’ unit we make today, almost 95% of what we manufacture. Therefore, the only change for some window suppliers will be to use warm edge spacers where they may currently use aluminium spacers.Our aluminium spacer bar suppliers have indicated that they will phase out aluminium to prevent being left with large unsaleable stocks. We will, therefore, also have to phase out the aluminium spacer, and all spacers from June 16^th will be warm edge. Shapes with curves will be made with a black warm edge bar only. Newbuild window suppliers/installers' new performance requirements:

• Whole window U-values of 1.2W/m2.K
  • Maximum 1.6W/m2.K if other fabric elements of the house are improved under SAP calculations.
• The specifiers of new-build dwellings will determine this, but it is largely anticipated that 1.2W/m2.K whole window U-values will be used.

Solution:

• IGU to incorporate a 1.0 W/m2.K glass type (such as Planitherm One T FG)
  • To achieve 1.0 W/m2.K centre pane, the cavity must be 16mm or 18mm with laminate glass.
  • 20mm cavities are 1.1W/m2.K
• When the whole building is SAP calculated, some profile systems may still need to meet the requirements, and triple glazing may be required.

I want you to know that Regency Glass has the products and production skills to meet these requirements and can offer assistance with different glass combinations to help meet the building regulations.