IKO ULTRA Heat-Activated Self-Adhesive Underlay

IKO ULTRA Heat-Activated Self-Adhesive Underlay

IKO ULTRA H-A Underlay is polyester-reinforced bitumen membrane used within a built-up roofing system.

The membrane is coated on both sides with self-adhesive bitumen, SBS elastomeric coating. A fine mineral upper surface with a 75mm release film selvedge facilitates rapid installation of lap joints.

The underside has a self-adhesive bitumen coating that provides a 40% partial bond, allowing vapour dispersion between the membrane and substrate. The self-adhesive coating is protected by a release film.

The IKO ULTRA H-A 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 documents.

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

The IKO ULTRA H-A Underlay has a 75mm selvedge lap with protective release film to the upper surface, and a 75mm wide selvedge lap to the corresponding underside to facilitate rapid sealing of the side laps.

Key benefits to your project

  • Flame-free application. Self-adhesive bonding to the primed substrate with laps secured using hot-air welding, so no requirement for gas torches.
  • Partial bond – reduces the potential for blistering.
  • Rapid installation – rolls can be installed quickly with additional rapid sealing of the laps.
  • Surface protection – the upper surface has a fine granule finish that provides additional protection to the membrane.

Product information

Brand: IKO Ultra
Material: Bituminous
Product type: Bituminous Membrane – Commercial
UK manufacturing: Yes
SKU: 62720000

Key performance criteria

By project type: New Build, Refurbishment
Installation method: Hot Air Welded, Partially Bonded, Self-Adhesive
Profession: Export Customers, Installing Contractors, Specifiers & Designers
Roof build ups: Warm Roof
Sector: Community & Amenity, Education, Health, Hotel & Leisure, Industrial, Mixed Use, Offices, Retail, Social Housing, Utilities


Width (mm): 1000