Using a model based on the latest design and paint finishing technology used in Wood Window Alliance windows, these factors were then applied to service life data from the Building Research Establishment Group (BRE) and Imperial College's own data.
The results showed that timber windows manufactured to Wood Window Alliance standards, have a minimum service life of 60 years - twice as long as the plastic equivalent - and in sheltered locations could last 80 years or more!
WWA Standards
The Wood Window Alliance brandmark is a reassurance of independently audited quality and performance.
It is awarded only to companies whose windows meet or exceed the following standards for sustainability, energy efficiency, weather resistance and operational performance:
- BS 644, the main British Standard for wood windows, or equivalent standards from other countries.
- The performance standards for wind and weather resistance of BS 6375 Part 1.
- The minimum performance standards for operational aspects of BS 6375 Part 2, or equivalent standards from other countries.
- Accredited by an independent UK or European body to prove compliance with those standards.
- Manufactured from timber, sourced legally from sustainably managed forests and with chain of custody.
- Service Life Warranties for durability (30 years), paint life (10 years), ironmongery and insulated glass units (10 years).
- Meet or better the UK Building Regulations' recommendations for energy efficiency.
Only once these standards have been met can members display the Wood Window Alliance brandmark.
Allan Brothers' membership of the Wood Window Alliance shows our commitment to producing high quality windows, and that you can rely on our products.
N.B. Not all the windows manufactured by Wood Window Alliance members are within the scheme - for example, conservation or specific design requirements may take precedence over these standards.