IKO Systems Heat-Activated Underlay

IKO Systems 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 to facilitate rapid installation of lap joints is also present.

The underside has a self-adhesive bitumen coating that provides a 40% partial bond allowing vapour dispersion between the membrane and substrate. The underside of the IKO system H-A underlay has a 75mm selvedge that is facilitates a rapid installation of the lap joints. The self-adhesive coating is protected by a release film.

The IKO Systems 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 document.

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

The IKO Systems 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 primed substrate with laps secured using hot air welding, 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.

Technical Information

Product Information

Brand: IKO Systems

By Project Type: New Build, Refurbishment

Installation Method: Hot Air Weld Lap Bond, Partially Bonded, Self-Adhesive

Material: Bituminous

Product Colour: Grey

Product Finish: Mineral

Product Type: Bituminous Membrane - Commercial

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

UK Manufacturing:

Key Performance Criteria

Accreditation: BES 6001, ISO 14001, ISO 45001, ISO 9001

Certification: CE

Membrane Carrier/Base: Polyester

Membrane Modifier: SBS


Length mm: 16000

Weight kg: 36

Width mm: 1000

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