STIFFENING ADD-ON PROFILE FOR WINDOW FRAME AND WINDOW FRAME COMPRISING SAME
A construction profile made of polymeric material and defining an inner cavity, the construction profile having an outer surface comprising unexposed side portions and exposed side portions, whereby a stiffening profile is provided external of said construction profile and at an unexposed side portion thereof, characterised in that said stiffening profile comprises a polymer material and a reinforcement material, the stiffening profile having a tensile (flexural) modulus in its length (L) direction of at least 5 GPa according to EN2561 and the polymer material having a lambda value of maximum 2 W/mK.