easy cover warm roof system


A pre-fabricated EPDM waterproof membrane suitable for forming ballasted, adhered or mechanically fixed, single ply roofs on new build and refurbishment projects.

Rolls of EPDM are thermally bonded in the factory to form large membranes, with a maximum weight of 2500 kg and a maximum size of 2,000 m². Roofs can thus be rapidly waterproofed, with no seams being formed on the roof.


  • High tensile strength and elongation at break.
  • 100% ozone and UV – radiation resistance.
  • Permanent elasticity.
  • Resistant to many chemicals (list available on request).
  • Resistant to root penetration (FLL approved in accordance with DIN 4102 T7).
  • Self extinguishing (NEN 6383).
  • Bitumen resistant.
  • Excellent temperature stability from -40 to + 120ºC.


Properly installed the system has a life of at least 35 years.

Design guidance:

– Substrates:

easy cover is suitable for use on concrete and timber-based substrates, as well as insulation boards laid over profiled metal sheet, and existing bituminous roof coverings.

– Vapour control layers:

Depending on internal conditions a vapour control layer may be required: consult Hertalan (UK) for details.

– Separation/ Protection layers:

Where easy cover is mechanically fixed a separating layer of Hertalan easy tex may be required to prevent the membrane 'drumming' on the substrate or damaging EPS insulation board.

In inverted roof systems the membrane should be protected from the ballast by a layer of easy.tex.

Where easy cover is to be installed over an existing bituminous waterproof covering with embedded chips consider using two layers of easy tex, or a thin mineral wool or EPS insulation board.

– Perimeters:

easy cover should be fixed along the whole perimeter with ks137, ks205 or ks96 adhesive.

General information

Uniclass 2015

Pr_25_57_51_66 Polymeric membranesPrimary


J42/10 Warm deck roof covering

J42/110 Warm deck roof covering

J42/120 Inverted roof covering

J42/130 Cold deck roof covering

Specification data - Polymeric membranes

Product Reference

easy cover

Waterproof membrane



easy cover

easy cover FtS

easy cover MF


Insert dimensions or refer to drawing.


1.2 mm

Standard thickness.

1.5 mm

2.0 mm


easy cover rainwater outlets

easy cover roof drains

easy.weld CS – 100 mm

easy.weld CS – 150 mm

easy.weld CS – 200 mm


Hertalan flashing

Product Options

Product reference:

  • easy weld: For ballasted and adhered roofing systems.
  • easy weld FtS: For mechanically fixed roof systems where the fixings penetrate the membrane. The fixings are then covered with strips of easy.weld or Hertalan S.
  • easy weld MF is intended for mechanically fixed roofing, and has flaps to receive the fixings factory welded to the underside. The flaps are positioned in accordance with the results of windload calculations.


Maximum dimensions 10 m x 20 m for easy cover MF, 30 m x 70 m for other types.


All grades available 1.2, 1.5 and 2.0 mm.


  • easy weld CS strips are available in widths of 120 and 180 mm. The underside of these strips is covered entirely in TPE.
  • easy cover rainwater outlets have the same dimensions as standard pre-fabricated outlets but are supplied with a TPE layer for hot air welding.
  • flash weld is a non-vulcanised EPDM with a special TPE layer on the underside, which enables it to be joined to an easy cover membrane using a hot air gun. flash weld can be moulded and will vulcanise slowly under atmospheric conditions. flash weld is used to form corners and angles, but should not be used for outlets or drain pipes.
  • Hertalan flashing is a non-vulcanised rubber that can be moulded into any shape or form by using heat. Hertalan flashing will vulcanise in open air with the effects of sunlight and heat. It is used at non-standard or unequal angles, at the edges of large round drains and to reinforce junctions at vents, drains and other details. Hertalan flashing is fixed to the easy cover membrane using ks 137 contact adhesive.

Third party certifications

  • Certificate: 91/2728/C : Hertalan EPDM roof waterproofing system
  • KOMO – UEAtc: Certificate: K4276

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