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A single ply polymeric membrane manufactured from VET-Terpolymer with a polyester fleece backing and a synthetic adhesive compound coating for warm roof applications.

System components:

Air and vapour control layer – StrataBar SA FF:

StrataBar SA FF is a self-adhesive, 0.8 kg/m² elastomeric, polymer distilled bitumen membrane for use as an AVCL in warm roof applications. The product is applied directly to the roof deck. All decks must be primed, sound, dry, smooth and free from contaminates.

Thermal insulation - Evatherm A:

EvaTherm A is a closed cell, chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) free (zero ozone depletion), rigid polyisocyanurate (PIR) foam core faced, both sides, with a perforated mineral coated glass fibre tissue. It has an exceptionally low thermal conductivity of 0.025 W/mK. It is suitable for fully adhered applications.

Waterproof membrane - Evalon VSK (Self Adhesive):

EVALON® ethylene vinyl acetate terpolymer (EVA) membranes for single-ply waterproofing of all types of flat roof construction. They consist of a high polymer alloy of EVA and polyvinyl chloride (PVC), a purpose-made thermoplastic material. Both components are high polymer solids and remain solid over time.

The membrane is fully bonded to the roof deck utilizing its strong self-adhesive backing. The laps are welded with hot air to form a homogenous seal. All decks must be sound, clean, dry, free from contaminates and primed with SK-L primer before application of the membrane.

General information
Specification data - Single layer sheet warm roof covering systems
Product Reference

Evalon VSK Self-Adhered Warm Roof System


1.2 mm

1.5 mm + 1.00 mm fleece backing


1050 mm

1550 mm


Dark grey

Light grey



See 'Options' below and insert requirements.

Standard product features

Technical characteristics:

- StrataBar SA FF AVCL:

  • Roll length: 40 m.
  • Roll width: 1.08 m
  • Thickness: 0.6 mm.
  • Vapour resistance: 11800.00 MN s/g.

- EvaTherm A Thermal Insulation:

  • Thermal conductivity: 0.025 W/m².
  • Compressive strength: 150 kPa.
  • Board size: 1200 x 600 mm.

- Evalon VSK Waterproof Membrane:

  • Roll length: 26.25 m.
  • External Fire Performance (as part of a roof build-up): EXT.F.AC / Broof(t4).

Product Options

Roll width:

Smaller width unbacked tapes for detail work are available.


Three colours available as standard, other colours available on request.


  • Alwitra cable/ lightning conductor clips.
  • Alwitra cold roof vent.
  • Alwitra evalon walkway tiles.
  • Alwitra horizontal rainwater outlet.
  • Alwitra PA20 paving support.
  • Alwitra refurbishment outlet.
  • Alwitra soil vent pipe.
  • Alwitra TA profile.
  • Alwitra TAG profile.
  • Alwitra vertical rainwater outlet.
  • EVA chute.
  • EVA drip edge trim.
  • EVA watercheck trim.
  • External corners.
  • ICB capping.
  • ICB protective rubber matting.
  • ICB PS1 paving support.
  • ICB solar fix profile.
  • Internal corners.
  • Lead roll profile.
  • PVC outlet.
  • Rainwater outlets.
  • SK- L primer.
  • Standing seam profile.