Dimpled high density polyethylene protection membrane with perforations.

abedrain® 20 P is a dimpled high density polyethylene (HDPE) membrane with 20 mm dimples including perforated slots.


abedrain® 20 P is used as drainage and protection membrane for roof gardens and planter boxes in conjunction with a geotextile and a waterproofing membrane such as abedex® AR. The dimples retain water and excess water is drained away thereby preventing water stagnation.

  • Good value
  • General purpose
  • Water retention
  • Water resource savings
  • Protection of the waterproofing membrane
  • Secondary waterproofing system
  • Thermal insulation
  • Excellent drainage capacity
Typical Physical Properties

Download technical datasheet.

Horizontal Application

The surface area must be waterproofed according to a.b.e.®specification. This is not a primary waterproofing membrane but is recommended for buried dual layer system applications. The first layer consisting of a 3 mm abedex® unigum torch followed by an antiriot bituminous membrane abedex® AR. Lay abedrain® 20 P in place with the dimples facing downwards. Should it be necessary to overlap, then 150 mm would be sufficient. Apply super laykold® waterpoofing tape 100 mm wide along the flat part of the product for this purpose. Where required place a geotextile membrane loosely on top of the abedrain® 20 P before spreading out the soil. This is important as the soil would otherwise fill the dimples and thereby reduce water drainage Spread out the soil according to the instructions of a qualified landscaper.

Cautionary Note

Do not butt-joint sheets.


Install abedrain® 20 P as supplied using an overlap of 150 mm between the sheets resulting in an overall coverage of 35 m2 per roll.

Model Specification

The drainage and protection membrane will be abedrain® 20 P a dimpled high density polyethylene protection membrane as supplied by a.b.e.®

The abedrain® 20 P will be applied in accordance with the recommendations of a.b.e.®


In order to guarantee the quality and characteristics of the abedrain® 20 P product, it is recommended to use the range of accessories specifically studied for each purpose. Please consult the technical department at a.b.e.® 


abedrain® 20 P is supplied 5 rolls per pallet and wrapped for protection.

Handling & Storage

The product has no expiry date. Keep out of direct sunlight for extensive periods. No heavy loads are to be placed or packed on top of the product.

Health & Safety

No known hazards.

Important Note

This data sheet is issued as a guide to the use of the product(s) concerned. Whilst a.b.e.®  endeavours to ensure that any advice, recommendation,
specification or information is accurate and correct, the company cannot accept any liability for application – because a.b.e.®  has no direct or
continuous control over where and how a.b.e.®  products are applied.

Further Information

Where other products are to be used in conjunction with this material, the relevant technical data sheets should be consulted to determine total

a.b.e.® has a wealth of technical and practical experience built up over the years in the company’s pursuit of excellence in building and construction