Black DPM Roll 4m Wide | 300mu 25m or 500mu 12.5m Polyethylene

Description

This black polyethylene damp proof membrane (DPM) gives a continuous moisture barrier under floors and screeds, protecting concrete floors, screeded floors and underfloor heating installations from rising damp and condensation. It is resistant to punctures, tears and chemical degradation and suits both domestic and commercial projects.

Supplied in 4m wide rolls in two grades: 1200 gauge (300 micron) in a 25m roll covering 100 m², and 2000 gauge (500 micron) in a 12.5m roll covering 50 m². Choose your grade and roll from the variant table below.

4m

Roll width

300 or 500mu

Thickness grades

1200 or 2000g

Gauge

100 m²

300mu, 25m roll

50 m²

500mu, 12.5m roll

Black

Polyethylene

Lay the membrane on a sound, smooth base and protect it from damage

Lay the DPM over a clean, smooth, sound base free of sharp edges and debris, and protect it from damage during installation. A punctured membrane will not stop moisture. Insulation or screed goes on top, so repair any tears before covering.

Match the grade to the job

The 500 micron (2000 gauge) grade is the heavier duty option; the 300 micron (1200 gauge) grade is lighter. Check the specification for your build-up, such as the minimum membrane gauge your insulation or UFH screed system requires, before ordering.

Common underfloor heating use

Tekwarm UFH boards are installed over a solid ground floor on a suitable DPM, and some floor insulation boards call for a 500 gauge protective membrane under screed. Both grades here exceed 500 gauge. Always follow your insulation and screed manufacturer's guidance.

Key features

Rising damp and condensation barrier

An impermeable polyethylene barrier that stops dampness seeping into floors and foundations.

Tough and tear resistant

Resistant to punctures, tears and chemical degradation for dependable performance on site.

Two thickness grades

1200 gauge (300 micron) and 2000 gauge (500 micron) to suit your specification.

Wide 4m rolls

4m wide rolls cover large floor areas quickly with fewer joints.

Domestic and commercial

Suited to new build, renovation and commercial projects, including areas prone to high moisture.

Roll format

Rolls are easy to handle and lay over concrete floors, basements and crawl spaces.

Technical specification

Product details

Material

Polyethylene

Colour

Black

Roll width

4m

Use

Damp proof membrane for floors, under insulation and screed

Grades

1200 gauge

300 micron, 25m roll, 100 m²

2000 gauge

500 micron, 12.5m roll, 50 m²

Gauge conversion

1 gauge equals 0.25 micron

Performance

Barrier

Impermeable to damp and condensation

Strength

Resistant to punctures and tears

Chemical resistance

Resistant to chemical degradation

Applications

Concrete floors, basements, crawl spaces, screed and UFH installations

Variants: 4m wide black polyethylene DPM rolls

Grade

Thickness

Roll size

Coverage per roll

500mu

2000 gauge

4m x 12.5m

50 m²

300mu

1200 gauge

4m x 25m

100 m²

Frequently asked questions

Which thickness should I choose?

The 500 micron (2000 gauge) roll is the heavier grade for tougher conditions, while the 300 micron (1200 gauge) roll is lighter. Choose according to your specification and the build-up above the membrane.

What does gauge mean?

Gauge is a thickness measure used for polythene sheet. 1200 gauge equals 300 micron and 2000 gauge equals 500 micron.

How much does each roll cover?

The 300 micron roll is 4m x 25m, covering 100 m² and the 500 micron roll is 4m x 12.5m, covering 50 m². Allow extra for laps and upturns at the edges.

Can it be used under underfloor heating?

Yes. It is commonly used as the moisture barrier under insulation and screed in UFH installations, such as under Tekwarm UFH boards on a solid ground floor. Follow your insulation and UFH manufacturer's instructions.

Is it suitable for domestic and commercial projects?

Yes. It suits both domestic and commercial projects, including new build and renovation.

How should I install it?

Roll out over a smooth, clean, sound base, lap and seal joints with suitable DPM jointing tape, and protect it from damage until it is covered by insulation or screed.

BTU Calculator

BTU & WATT Calculator

Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

Calculate

Required Heating

0

Watts

0

BTUs