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Advanced System

The Advanced System was designed to accept a deeper double glazed unit over the Heritage System. A decorative bronze beading secures the glass in place, resulting in a particularly attractive profile when viewed from the outside.

The Advanced System can be fitted with either a traditional or contemporary shaped bead. This choice allows greater compatibility to the architectural design of your project.

System Features

Slim Frame Profile
Traditional Bronze Bead
Optional Contemporary Bead
Double Glazing (18mm)
Side Hung Unit
Top Hung Unit
Fixed Unit
Curved Windows
Rebated Leg Profile
Equal Leg Profile
Vertical and/or Horizontal Transoms
Mock leaded unit
Optional Trickle Ventilation
Double Weather Seal
Historic/Period Buildings

System Drawing

Click images to enlarge

Opening Frame

Fixed Frame

Equal Leg Fixed Frame

Strength, Wind, Water And Security

The tests below are carried out on side-hung outward opening windows measuring 1650mm x 600mm and are tested excluding any additional security features.

BS 6375 Part 1: 2009 (performance of windows and doors)

Wind 2000 Pa Class A5
Water 250 Pa Class 6A
Air 600 Pa Class 4
Exposure Category 2000

EN14351 Part 1 Clause 4.8


Recommended Design Limits

Side Hung Casement

Max O/a Width 650mm
Min O/A Width 300mm
Max O/A Height 1700mm

Area of side hung casement must not exceed 1.105m2.
Casements over 1100mm high will require 2 handles.
Where width is greater than height, casement sash must be top hung.

Top Hung Casement

Max O/a Width 1200mm
Min O/A Width 300mm
Max O/A Height 500mm
Min O/A Height 300mm

Fixed Lights

Max O/A Width 1200mm
Max O/A Height 2400mm

The inclusion of glazing bars, trickle ventilation, opaque glazing and abutment details may alter performance data and design limits. Please contact our sales team to discuss any requirements outside of the standard size limits detailed above.


U-value performance based on an 18mm double glazed unit made up of 4mm float/10mm 90% Krypton filled cavity/4mm Planitherm total + with warm edge spacers.

Fixed casement overall value 1.6W/m2K
Opening casement overall value 1.8W/m2K
Centre pane value 1.1W/m2K

When incorporating a genuine Georgian bar add 0.4 to the U-value.

U-values calculated in accordance with BS EN iso 10077-1:2006 based upon a single fixed light sample 1230mm x 1480mm and a single opening light sample 1230mm x 1480mm. Inclusion of glaze bars, trickle ventilation or equal leg will affect performance. Worst case system value 2.7W/m2K based upon single opening equal leg casement 1230mm x 1480mm with glaze bar and trickle ventilation.

Part Q Security

Tested with scroll handles, plain back plates, manor stays and Part Q casement locks. Below test carried out on windows measuring maximum 650mm x 1700mm.

Side opening and fixed casements. Pass

Information from Advanced System Data Sheet

Version: BR-IS23 RevF

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