IKO Systems Torch-Free (T-F) Underlay

IKO Systems Torch-Free (T-F) Underlay is a polyester reinforced bitumen membrane, used as an underlay within a built up roofing system; the membrane is coated on both sides with a self-adhesive bitumen SBS elastomeric coating. The upper surface is protected with a protective film that facilitates rapid bonding of the waterproofing layers. The self-adhesive coating underside is protected by a release film.

The underside has a self-adhesive bitumen coating that provides a 40% partial bond allowing vapour dispersion between the membrane and substrate and also has a 75mm selvedge that is facilitates a rapid installation of the lap joints.

The IKO Systems T-F Underlay is used as a partially bonded underlay within a built up roofing specification system. It is to be used only for main flat roof areas and roof pitches up to 5° if reliant on adhesion alone. For roof pitches over 5° this underlay should also be mechanically fastened in accordance with BS8217 table 5 or the IKO specification document.

The unique self-adhesive profile of the IKO Systems T-F Underlay allows for a partial bond to be achieved to the substrate therefore reducing the risk of blistering from any trapped vapour.