SR242 Installation of domestic windows (2010)

New Zealand houses are using larger windows and are being built on more exposed sites. Double and triple glazing is becoming common, and the glass is often placed at an eccentricity of 20 mm to 60 mm from the face of the framing.

This report investigates whether the use of the WANZ support bar is able to transfer this eccentric load back to the timber sill trimmer and whether the sill trimmer will undergo excessive twist due to this loading.

This report also derives the design strength for the staple connection between window frame and reveal and the nailed connection between reveal and window trimming studs. It examines whether standard spacing of these connectors will be adequate to prevent failure in design level windstorms.

Finally, this report calculates the design pressure that should be used in prototype window tests to NZS 4211 and compares this with the actual pressures recommended by this standard.