FORMA/FORMAPLUS Outward Opening

Traditional style

Designed to complement traditional British architecture, FORMA and FORMAPLUS windows feature timeless details, such as bevelled edges and angled glazing beads, which make these windows the ideal fit for classically styled homes or older properties. Optional glazing bars add the perfect finishing touch.

FORMA – key features and benefits
Solid wood frame
Life expectancy of 60 years
Double or triple glazed
Available in more than 200 colours
Meets Secured by Design standards

FORMAPLUS – key features and benefits
Solid timber frame externally clad in aluminium
Life expectancy of 83 years
Double or triple glazed
Available in more than 200 colours
Dual colour frames at no extra charge
Meets Secured by Design standards

Timber or aluminium clad timber windows?

Timber
Our timber windows consist of solid wood from the very innermost structure through to the external, resulting in excellent thermal and acoustic performance, combined with easy maintenance. It is available in either double or triple glazing, and has been designed to exhibit the very best in energy efficiency.

Triple glazed:
Best performance: 0.78 W/m2 K U-value
42 dB Rw sound reduction

Rationel FORMA is a timber product.

Aluminium clad timber

Boasting all the benefits of all-timber windows using the same solid timber structure, the external aluminium cladding offers exceptional durability on the outside, with easy maintenance on the inside. The addition of aluminium cladding means a far increased life expectancy of your windows – by as much as 20+ years. What’s more, the extremely durable nature of this style ensures it will withstand even the harshest of weather conditions with ease.

Triple glazed:
Best performance: 0.79 W/m2 K U-value
42 dB Rw sound reduction

Rationel FORMAPLUS is an aluminium clad timber product.