Window and door specification from Electronic Blueprint for builders

When purchasing doors and windows, it is essential that all relevant information be passed to the purchasing officer and to the supplier. Glass windows and doors can be the source of considerable heat gains to, and loss from, buildings.

However, the correct specification of glass and frames can significantly reduce this effect. The Building Code of Australia, Volume 1 Part J2 and Volume 2 Part 3.12.2, specify requirements for energy efficiency of external glazing.

The following information must be correctly specified and communicated:

• BCA Energy Requirements.
• Solar Heat Gain Co-efficient (SHGC), a measure of how well the glazing (glass and frame) limits the heat energy of sunlight.
• Thermal transmittance, U, which is a measure of the heat passing through the glazing via conduction.
• Other relevant considerations that deal with light, solar energy and ultra-violet reflection and transmission.
• Applicable wind pressure resistance, determined in accordance with AS 4055 for domestic applications.
• Other relevant matters to do with the sizes, reveal dimensions and material, frames, operation, locks, keys, coating, colour, seals, fly screens and the like.

For other specifications, refer to www.electronicblueprint.com.au Section 6.