TRC Replacement Glass with Slim Double-Glazed Units

Glass replacement for timber sash windows and casement windows. Slim double-glazed units improve security, acoustics and thermal performance.

Ultra-slim double-glazing provides superb performance, while retaining the elegance of the original windows.

Features and benefits:

  • Ultra-slim, sealed double-glazed units.
  • Fits into most single-glazed openings.
  • Thermal performance meets Approved Document L
  • Five-year guarantee.
  • Warm edge spacer bar reduces perimeter condensation.
  • Elastic dry glazing sealant for durability.

General information

Uniclass 2015

Pr_30_59_98_96 Wood window unitsPrimary


L10/10 Wood windows

L10/210 Wood windows

Specification data - Wood window units

Product Reference

TRC Replacement Glass with Slim Double-Glazed Units


Double glazed, 12 mm thick

Standard, ultra-slim and efficient.

Special order

Insert requirement, available with larger cavities, thicker glass or acoustic glazing.

Sealant finish

Insert requirement, consult with manufacturer for information.

Standard product features


Two panes of 4 mm thick glass filled with a krypton or a krypton/ xenon mix heavy gas which aids acoustic performance. The inner pane is a Low-E glass, which reflects heat back into the room.


Elastic sealing compound Repair Care Dry Seal™ MP. It has superb elasticity, even after years in situ. It is available in a choice of finishes and can be overpainted. The result is a superior, long-lasting, effective seal which will protect the window for years to come.


  • Acoustic: 31 dB Rw (typical 12 mm unit, values up to 38 dB Rw are available with specialist acoustic glazing units).
  • U-value: 1.9 W/m²K (typical 12 mm unit, lower values up to 1.3 W/m²K are available for units with larger cavities or thicker glass).

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