Data Sheet:
Windows Data Sheet
- Information suitable for:
- New build
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Technical information
Windows should be positioned with their front face 20mm past the back of the brickwork for improved thermal efficiency.When installing vertical and horizontal cavity closers around window openings ensure all joints are square and free from gaps and screw fix the internal flange to the inner leaf of the wall.
Over openings, to reduce the possibility of heat loss, use an insulted cavity lintel such as Catnic Cougar.
As the chart shows, the most cost effective glass to use within the window is a double glazed argon filled unit with planitherm glass, giving a U-value of 1.2 W/m2K. Another factor which may influence this when the construction of the external wall changes.
Windows should be positioned with their front face 20mm past the back of the brickwork for improved thermal efficiency.When installing vertical and horizontal cavity closers around window openings ensure all joints are square and free from gaps and screw fix the internal flange to the inner leaf of the wall.
Over openings, to reduce the possibility of heat loss, use an insulted cavity lintel such as Catnic Cougar.
As the chart shows, the most cost effective glass to use within the window is a double glazed argon filled unit with planitherm glass, giving a U-value of 1.2 W/m2K. Another factor which may influence this when the construction of the external wall changes.
Hints and Tips
Ensure cavity closers are installed the correct way around with the full plastic side against the external skin.
Vertical cavity closers should have 75mm of their flanges trimmed at the bottom allowing the insulated centre section to continue down into the cavity forming a complete butt connection with the horizontal cavity closers insulated section.
Windows should be secured in place using fixing tabs attached to the sides of the frame and screw fixed to the inner leaf of the wall. This removes the need to fix the window through the frame improving thermal performance.
Ensure the window is fully sealed around the external face using silicone frame sealant.