HDPE pre-applied membranes arr_right_inav

High Density Polyethylene (HDPE) Pre-applied Waterproofing Membrane

Description Specifications Scope of Application FAQ Download

Description

PMH-3040 Plus is a pre-applied high density polyethylene (HDPE) Waterproofing membrane. It is a composite sheet comprised of thick HDPE film, pressure sensitive adhesive and weather resistant protective coating.It is designed with 80mm dual adhesive seams that allows a strong bond which creates a super strong adhesion and is unaffected by weather elements.This integral bond is specifically designed to provide a robust barrier to water, moisture and gas and prevents both the ingress and lateral migration of water. PMH 3040 Plus membranes are release liner free and designed for efficient, reliable installation.

Specifications

**Packaging and Specifications**
Item	Description
Packaging	Roll
Width (m)	1.2 (can be customized)
Thickness (mm)	1.2 or 1.5
Length (m)	30 (can be customized)
Roll Size (m2/roll)	36m2

Typical Properties

Description	Test Methods	Values
Color	-	White
Thickness, mm	ASTM D3767	1.2mm
Tensile strength	ASTM D412	28 MPa
Elongation	ASTM D412	500%
Puncture resistance	ASTM E154	1000 N
Peel adhesion to concrete	ASTM D903	1800N/m
Resistance to hydrostatic head	ASTM D5385	71 m
Peel strength in lap	ASTM D1876	1800N/m
Crack cycling	ASTM C1305	Passed
Water vapour transmission	ASTM E96 Method B g/(m2.h）	0.0043
Water Absorption	ASTM 570	0.5%
Flexibility at low temperature	ASTM D1970	-29℃

Application Method

Surface Preparation

It is essential to create a sound and solid substrate to eliminate movement during the concrete pour. Substrates must be regular and relatively even with no gaps or voids exceeding 12mm.

Horizontal substrate:

· The blinding / lean concrete must be relatively free of loose aggregates and sharp protrusion levelled as much as possible. The surface does not need to be dry, but standing water must be removed.

Vertical substrate:

· All surfaces to receive pre-applied waterproofing membrane must be sound and clean.

· The surfaces shall be relatively even, free of defects or irregularities that might damage the membrane.

Application

· Do not lay membrane in temperature below 5°C。

· Where temperatures will exceed 38°C (100°F) for more than a total of 7 days, concrete should be placed within 42 days of installation of the membrane. Concrete must be placed and compacted carefully to avoid damage to the membrane. A sharp object is strictly forbidden to be used to consolidate the concrete during concrete pour.

Features & Benefits

· Unaffected by ground settlement.

· Easy application & reduced installation time.

· No lateral migration of water.

· White solar-reflective surface results in reduced temperature gain.

· Can be applied to permanent formwork - Allows maximum use of confined sites.

· High puncture resistance - Trafficable immediately after application.

· Unaffected by wet weather.

· Easy roll/kick out installation reduces installation time and cost.

· Release liner free design expedites installation and reduces construction site waste.

· Installed membrane is unaffected by freeze/ thaw or wet/dry cycling.

· Chemical resistance-Designed to help protect the structure from salt or sulphate attack, and is effective in most types of soils and waters.

· Resistant to methane and radon gases.

Scope of Application

· Grounds slabs.

· Areas in contact with earth such as slabs & walls.

· Caverns, tunnels, subways, municipal pipe corridors, etc.

· All underground structures.

· Permanent and removable formwork.

FAQ

What is a polymer pre-applied waterproofing membrane?

A polymer pre-applied waterproofing membrane is a waterproof sheet applied before the concrete pour. It bonds permanently to structural concrete, creating a secure barrier against water ingress.
Why should I choose a pre-applied membrane over traditional waterproofing systems?

Pre-applied membranes offer enhanced protection against water migration, improved durability, reduced risk of leaks due to their full adhesion to the structure and saved construction time, labor and expense.
How long does the membrane last?

Typically, these membranes are designed for a service life of 25–50 years, depending on the product and environmental conditions. For high quality product, such as PMH 3040/PLUS and PMH 3080/PLUS could last as long as the designed life of structure

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