The IKO Easyseal Heat-Activated Partially Bonded Underlay comprises a polyester-reinforced carrier coated on either side with heat-activated bitumen SBS elastomeric coating. It has a fine mineral upper surface and a 75mm release-film selvedge on the lower surface to facilitate lap-joint installation.
The underside of the IKO Easyseal Heat-Activated Fully Partially Underlay also has a heat-activated bitumen coating that provides a 40% partial bond to primed substrates.
The IKO Easyseal Heat-Activated Partially Bonded Underlay is for use as a reinforced bitumen underlay within built-up roofing systems for new build and refurbishment, commercial and domestic projects. It is suitable for roof pitches up to 5° if reliant on adhesion alone.
The underlay can be used only on main flat roof areas; it allows for a partial bond to be achieved to the substrate, therefore reducing the risk of blistering from any trapped vapour.
For roof pitches over 5°, the underlay should also be mechanically fastened in accordance with BS8217 Table 5. This underlay must be used in conjunction with any IKO SBS torch-on capsheet and be installed in accordance with IKO recommendations.
