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A light grey, calendered, flexible PVC membrane with laminated glass fleece reinforcing. It is designed to be UV, and weather resistant with high moisture vapour permeability, high bacteria and root resistance.

Alkorplan L is designed for use in loose laid, ballasted roof systems.

Alkorplan L conforms to DIN 16735 and is assessed to have a service life in excess of 30 years.


Joints are formed either by hot-air welding, or by solvent welding followed by sealing.

General information
Specification data - Polymeric membranes
Product Reference

AlkorPlan® L 35177


1.2 mm

1.5 mm



AlkorPlan® 35X71 unreinforced detailing membrane

AlkorPlan® 81038 seam sealer

AlkorPlan® 81080/ 81061/ 81062 corners

AlkorPlan® 81088 outlets

AlkorPlan® 81170/ 81171 Metalsheet

AlkorPlus® 81025 solvent welding fluid

Standard product features


Light grey.

Product Options


1.2 mm thick:

  • Width: 2.05 m.
  • Weight: 1.57 kg/m².
  • Roll length: 20 m.

1.5 mm thick:

  • Width: 2.05 m.
  • Weight: 1.96 kg/m².
  • Roll length: 15 m.


  • AlkorPlan® 35X71 unreinforced detailing membrane: 1.5 mm unreinforced membrane and junction strip for waterproofing outlets, pipes, seams and Alkormetal sections.
  • AlkorPlan® 81060/ 81061/ 81062 corners: Inner (81060), outer (81061) and rooflight corners (8106) formed from light grey unreinforced AlkorPlan.
  • AlkorPlan® 81170/ 81171 Metalsheet: 0.6 mm thick galvanized steel sheet with 0.8 mm thick unreinforced AlkorPlan® membrane laminated to the surface. Designed for the creation of upstands, parapets and drips.
  • AlkorPlan® 81088 outlets: Unreinforced AlkorPlan® outlets for a reliable connection to existing outlets. Light grey PVC. Available in 70, 85 and 110 mm diameters.

Third party certifications
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