Waterproofing & Concrete Protection

250 Micron Green DPM Sheeting (Under-Surface Membrane) – 1000 Gauge

250 micron green DPM sheeting (1000 gauge) to SANS 952 Type C, the under-surface membrane laid beneath floor slabs and surface beds. Widths from 1 m to 4 m, delivered across Africa.

SABS-Marked to SANS 952 Type C

250 Micron / 1000 Gauge

Widths from 1 m to 4 m

Colour-Coded for Site Identification

Overview

250 Micron Green DPM Sheeting is the under-surface membrane laid beneath concrete floor slabs and surface beds. It performs the same job as black sheeting, stopping ground moisture rising into the building and stopping the ground drawing water out of the fresh concrete, but the green colour makes it instantly identifiable on site.

That matters more than it sounds. On sites running several grades at once, the colour tells the foreman and the inspector at a glance which membrane has been laid, without unrolling a sample or hunting for the label. Where a specification calls for green under-surface membrane, a black roll can be rejected even if the thickness is identical.

The sheeting is green low-density polyethylene made to SANS 952 Type C and carries the SABS mark. At 250 micron (1000 gauge) it meets the minimum under-slab thickness SANS 10021 sets for dry sites and that Agrément South Africa accepts, so it satisfies standard residential and commercial specifications.

Narrow widths are its other advantage. Rolls come in 1 m, 2 m, 3 m and 4 m widths on 30 m lengths, so a 1 m or 2 m roll suits strip foundations, trenches and narrow surface beds where a 3 m roll would be cut down and wasted.

Take care to buy the right green sheeting. General-purpose green film sold for agriculture and household use looks similar but is not SABS-marked and is not intended for damp proofing in buildings. Every roll we supply is SABS-marked, with compliance documentation for your building inspection, and delivered to over 30 countries across Africa.

MaterialLow-density polyethylene (LDPE)
StructureMono-extruded film
ColourGreen
StandardSANS 952 Type C (SABS-marked)
Roll Width1 m, 2 m, 3 m, 4 m
Roll Length30 m

Typical Properties

Product	Reference	250 µm Black	250 µm Green	375 & 500 µm Orange	500 µm Black
Material	-	LDPE	LDPE	LDPE	LDPE
Standard	SANS 952	SABS Type F	SABS Type C	SABS Type A	SABS, Type C
Nominal Thickness	SANS 952	250 µm (0.25 mm)	250 µm (0.25 mm)	375 µm (0.375 mm) / 500 µm (0.50 mm)	500 µm (0.50 mm)
Gauge Equivalent	µm × 4	1000 gauge	1000 gauge	1500 / 2000 gauge	2000 gauge
Specified Use	SANS 10021	Under-slab DPM on dry sites	Under-slab DPM	Basement and below-ground tanking	Semi-basements and low hydrostatic pressure
Minimum Lap	Agrément SA	100–150 mm (by wall thickness)	100–150 mm (by wall thickness)	100–150 mm (by wall thickness)	100–150 mm (by wall thickness)
Sand Blinding	SANS 10021	≥ 50 mm, well tamped	≥ 50 mm, well tamped	≥ 50 mm, well tamped	≥ 50 mm, well tamped
Joints	SANS 10021	Lapped, sealed, turned up at walls	Lapped, sealed, turned up at walls	Lapped, sealed	Lapped, sealed, turned up at walls
Roll Lengths	-	30 m, 100 m (jumbo)	30 m	30 m	30 m
Roll Widths	-	3 m, 6 m	1 m, 2 m, 3 m, 4 m	3 m, 4 m	3 m, 6 m

Note: The above specifications represent the product family properties. Please refer to the product datasheet for individual SKU values.

Typical Applications

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Residential Construction

250 micron Black DPM laid beneath concrete slabs to prevent rising ground moisture in home foundations and flooring — the standard spec for residential builds.

Mining Facilities

500 micron heavy-duty Black sheeting for mining infrastructure floors and foundations, where puncture and tear resistance under harsh site conditions is critical.

Basement Tanking & Waterproofing

375 micron Hyperlastic Orange SABS Type A membrane installed vertically to waterproof basements and below-grade walls against water ingress and structural damage.

Compatible Systems

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250 Micron Black

Standard-duty SABS Type C sheeting for residential slabs and light commercial DPM. Supplied in 3m x 30m, 6m x 30m, and Jumbo 3m/6m x 100m rolls.

500 Micron Black

Heavy-duty SABS Type C sheeting built for industrial floors, mining infrastructure, and high-load slabs. Supplied in 3m x 30m and 6m x 30m rolls.

375 Micron Hyperlastic Orange

SABS Type A waterproofing membrane for basement tanking and vertical DPC applications. High-visibility orange for easy site identification. Supplied in 4m x 30m rolls.

Green DPM/DPC

Damp proof membrane favoured for its clear visibility on-site during slab pours. Same SABS Type C protection as our Black range, in a colour that's easy to spot and inspect.

Installation Guidance

Standard Method Statement

Lay DPM sheeting in the widest practical widths to minimise the number of joints across the slab area. The membrane should be turned up at the perimeter and dressed against all load-bearing walls, forming a continuous barrier between the ground and the concrete pour — not a series of disconnected sheets. This is the standard laying method for SABS-approved Type C construction sheeting under SABS 952-1:2011.

Where two sheets meet, overlap the joint by a minimum of 100mm and seal it with a compatible jointing tape, pressed down firmly along the full length of the lap

For basement tanking and vertical waterproofing applications, one layer of 375 micron Hyperlastic Orange sheeting is installed bearing SABS 952-1:2011 Type A certification. All joining on this application must be carried out strictly in accordance with the installation instructions supplied with the product - tanking performance is more sensitive to correct sealing than standard under-slab DPM.

Inspect sheeting for punctures or tears caused by reinforcing steel, sharp aggregate, or site traffic before the concrete pour, and patch any damage with matching jointing tape immediately - a single unpatched puncture can compromise the entire moisture barrier. Store and handle rolls to limit unnecessary UV exposure prior to laying, and avoid dragging sheeting over abrasive surfaces during placement.

Quality Assurance & Testing

Field QA/QC Checklist

Material Conformance: Film thickness (micron) and grade checked against the specification; vapour retarder performance to ASTM E1745 where specified.
Substrate: Blinding or sand bed level and free of sharp stones.
Laps & Sealing: Laps of the specified width, sealed with compatible tape; penetrations sealed; installed to ASTM E1643 where specified.
Protection: Punctures repaired before reinforcement or concrete is placed; no traffic directly on the film.

Manufacturing Standards

ASTM E1745 vapour retarder specification (where specified)
ASTM E1643 vapour retarder installation (where specified)
Manufacturer product data
SANS 952 Type C (SABS-marked)

Documents

CATEGORY GUIDEPDF DOCUMENT

Product Selection Guide

Compare performance properties across the entire category hierarchy before specifying.

View guides

INSTALLATIONPDF DOCUMENT

Installation & Method Statement

Standard deployment procedures, installation specifications, and field application method statements.

QUALITY CHECKLISTREQUEST ON DEMAND

QA/QC Site Checklist

Field quality control procedures, inspection checklists, and testing standards to verify installation integrity.

TECHNICAL SPECREQUEST ON DEMAND

Technical Data Sheet (TDS)

Guaranteed minimum average roll values (MARV) and material testing properties.

ACCESSORIES GUIDEREQUEST ON DEMAND

Chemical Resistance / Accessories Guide

Chemical compatibility matrix and list of auxiliary materials needed for installation.

Projects Using 250 Micron Green DPM Sheeting (Under-Surface Membrane) – 1000 Gauge

Case studies and reference projects for 250 Micron Green DPM Sheeting (Under-Surface Membrane) – 1000 Gauge will be published shortly. Contact our technical team for reference projects across Africa.