DPC Membranes

DPC Membrane

DPC is manufactured to approved British Standard Requirements for the composition, finish and impermeability of Polythene Damp Proof Course for use in masonry construction.

Description

DPC consists of a black, low density polyethylene sheet with a mass in the range 0.425 kg/m2 to 0.54kg/m2 formed from a polyethylene polymer of a melt flow rate of five or less when measured according to BS 2782:


Method 720A and has a density within the range 0.915g/ml to 0.925g/ml at 23°C when tested according to Method 620A, 620B or 620D of BS 2782:
Method 620A and 620D: 1980
The sheet contains a minimum of 2% by mass of evenly dispersed carbon black and contains not more than 5% by mass of material other than polyethylene.

DPC is manufactured in a single layer thickness of not less than 0.48mm ensuring the material is free from any air bubbles and that there are no visible pin holes.

Installation

InstallationInstallation must be in accordance with the relevant section of CP 102: 1973 Protection of buildings against water from the ground, and must follow normal good practice for the detailing of damp-proof courses, as set out in BS 5628: Part 3: 1985, and be in accordance with the manufacturers instructions.

Work can be carried out in all weather conditions normal to the construction of walls.

The DPC must extend through the full thickness of the wall or wall leaf; including pointing, applied rendering or other facing. The DPC must be laid on an even bed of mortar. Any perforations in adjacent courses of brickwork must be completely sealed using double sided jointing tape. When using this product with boot lintels or similar construction, it is recommended that the material is installed to follow the lintel profile.

Cleaning of Cavities

As with most other damp course materials, damage can occur during cleaning of mortar droppings from the damp proof course unless care is taken. The following recommendations should prevent damage occurring:
1. Cavity battens should be used to prevent excess mortar droppings reaching damp proof course.
2. Mortar droppings should be removed before they have time to harden.
3. Implements such as steel rods should never be used for cleaning.
4. Damp proof courses should be examined for damage as work proceeds.

Applications:

Advantages

 

Properties
Water Absorption Nil
Water Vapour Permeability 0.000074 16/FT2hatm 0.00036kg per m2hatm
Tear Resistance 6.77 kg/MM2
(ASTM-D.1.004)
Tensile Strength 1.14 kg/MM2
Breaking Elongation 500%
Temperature Range -50°C to +115°C

 

Width
M2/Roll
Rolls/Pack
100mm (4")
3
9
102.5mm (4.5")
3.375
8
150mm (6")
4.5
8
225mm (9")
6.75
4
300mm (12")
9
3
337.5mm (13.5")
10.125
3
450mm (18")
13.5
2
600mm (24")
18
2
900mm (36")
27
1
1200mm (48")
36
1

All rolls supplied in standard lengths of 30 linear metres. Rolls are supplied packed in polythene sleeves allowing easier and more economical handling, storage and distribution.

Specification:

Black polythene 2000 gauge (500 microns) damp proof course with a high geometrically embossed surface. Manufactured to BS 6515.