Technical Information

WERS - The Window Energy Ratings Scheme 

2014 WERS Certified Products Directory - AFRC 

NOTES  1.These results are not for public reference can only be used by financial WERS members only. 2.The use of these results requires manufacture validation through the AWA Accreditation Scheme. 3.Uw is the whole window U-value  4.SHGCw is the whole window solar heat gain coefficient 5.Tvw is the whole window visible (light) transmittance  6.Percentage improvement figures are compared with using base-case Generic Window 1 (3mm clear in standard aluminium frame)  7.A negative percentage improvement figure indicates performance worse than the base-case window  8.A positive percentage improvement figure indicates performance better than the base-case window  9.Maximum air infiltration is 5.0L/s.m2 at a positive pressure difference of 75 Pa as measured according to AS 2047  10.Static performance (Uw SHGCw Tvw Tdw) calculated using Window 6.3 and Therm 6.3 software (LBNL), 1999-2010  11.Annual energy performance (stars and % improvements) calculated using Nationwide House Energy Rating Software (AccuRate) according to procedures of WERS 2008.  12.Results disclosed at Australian Fenestration Rating Council (AFRC) regulations.

BAL – Bushfire Attack Level

BAL Ratings for GEM Aluminium Windows & Doors

*Note: Stocked aluminium sliding windows, sliding and stacker doors come with standard glass. It is the customer’s responsibility to ensure the window and glass being purchased satisfies any council or BCA requirements. Only some stock sizes in sliding windows come with 4mm toughened glass, the rest are 4mm clear float. Most sliding and stacker doors come with standard 4mm toughened glass, some large doors come with 5mm toughened glass (refer to price list tables for the relevant items).

AS – Australian Standards

All products are manufactured in accordance with any relevant Australian Standards. The Australian Standards, which are applicable to all window manufacturers in Australia are listed as follows:

AS2047 – Windows in Buildings – Selection and Installation

Specifies requirements for materials, construction, installation and glazing for windows, sliding doors, adjustable glass louvres, shopfronts, and window walls with one-piece framing elements. As a supply only company, GEM products satisfy the requirements of the standard from a materials point of view, however it is up to the installer to insure that the Selection and Installation of the product also satisfies the standard’s requirements.

AS1288 – Glass in Buildings – Selection and Installation

Specifies procedures for the selection of glass to comply with wind loading requirements and human impact considerations for framed and unframed glass assemblies of limited dimensions. The standard also includes installation guidelines and appendices for design of glass fins as well as the interpretation of human impact considerations and wind load design charts.  

*Note: It is customer’s responsibility to ensure that the appropriate AS and BCA requirements are met when it comes to selection and installation of windows and doors being purchased from GEM. Such requirements may include but are not limited to: height restricted windows, wet area glazing, impact area glazing and others.