IKO Systems H-A Underlay

Application

For use as reinforced bitumen, partially bonded underlay within in a built-up roofing specification system, in both new build and refurbishment projects. Must be used in conjunction with an IKO torch applied cap sheet or in accordance with an IKO specification.

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 BS 8217 table 5 or the IKO specification.

Prime the substrate using either IKO Systems Bonding Agent or IKOpro Sprayfast MPP.

Description

A polyester reinforced bitumen membrane used as an underlay within a built-up roofing system, The membrane is coated on both sides with self-adhesive bitumen styrene butadiene styrene (SBS) elastomeric coating. The product has a fine mineral upper surface with a 75 mm release film selvedge to facilitate rapid installation of lap joints.

Features and benefits:

  • Flame free application – self-adhesive bonding to a 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.
  • CE marked.

Applications:

For use as reinforced bitumen, partially bonded underlay within in a built-up roofing specification system, in both new build and refurbishment projects. Must be used in conjunction with an IKO torch applied cap sheet or in accordance with an IKO specification.

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 BS 8217 table 5 or the IKO specification.

Prime the substrate using either IKO Systems Bonding Agent or IKOpro Sprayfast MPP.

General information

Uniclass 2015

Pr_25_57_08_75 Reinforced bitumen roofing sheetsPrimary

CAWS

J41/10 Built-up reinforced bitumen membrane warm deck roof covering

J41/110 Built-up reinforced bitumen membrane warm deck roof covering

J41/12 Built-up reinforced bitumen membrane cold deck roof covering

J41/130 Built-up reinforced bitumen membrane cold deck roof covering

Specification data - Reinforced bitumen roofing sheets

Product Reference

IKO Systems H-A Underlay

Standard product features

Technical characteristics:

  • Composition: SBS.
  • Form: Roll.
  • Colour: Fine grey granule.
  • Length: 16 m.
  • Width: 1 m.
  • Mass/ weight: 2.25 kg/m².
  • Roll weight: 36 kg.
  • Carrier: Polyester (175 g/m²).
  • Membrane bond: Self-adhesive.
  • Lap bond: Hot air weld.

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