Rationel Aluclad is the sister approach to VELFAC's composite construction — a timber core with an aluminium weather cladding, produced in Denmark and often specified where thermal performance is the governing requirement.
Thermal figures worth paying attention to
Aluclad reaches Uw values from 0.7 W/m²K, which places it among the better residential windows available in the UK regardless of construction type.
The Scandinavian visual language
The restrained profile geometry sits well on both contemporary and traditional houses and is particularly at home on projects around Welwyn Garden City where the vernacular calls for quieter detailing.
Rationel or VELFAC
The two ranges cover overlapping territory. Deciding between them usually comes down to available colour finishes, lead time and the supplier's own working experience with each.
For readers researching options locally, 5EC's aluminium windows and 5EC's heritage aluminium range are both worth reviewing — both are handled by 5EC, a Stevenage-based authorised supplier working across Hertfordshire.
Detailed technical documentation is available on the Rationel product pages.