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Poly Dampcourse

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THICKNESS 200UM-500UM
WIDTH 100mm-1500mm
LENGTH 30m-100m
A damp proof course ( DPC ) is a physical barrier inserted into the fabric of a building to stop water passing from one place to another. This can be on a horizontal plane, stopping water rising up from the ground by being sucked up by the dry masonry above, or vertically to stop water passing from the outside of a building, though the masonry, to the inside. DPC's have taken many forms through the ages and one of the earliest forms was to use a layer of slate in the construction. Slate is still used but the less expensive plastic version ( below right ) is now more widely used.
Technical Specification of DPC
Water Vapour Permeability

0.28 gm2 day-1

BS3177
Water Vapour Transmission

733 MNsg-1


Water Absorption

0.22%

BS2782 : 430A
Resistance to Leakage at Joints

PASS

MOAT 27 : 5.2.1
Tensile Strength of Joint

UNAGED : 300 N
HEAT AGED : 290 N
WATER SOAK : 257 N

MOAT 27 : 5.2.2/3/4
Cold Flex Temperature

−60°C

BS2782 : 320A
Tensile Strength

L : 12.9 Nmm-2
T : 11.2 Nmm-2

BS2782 : 320A
Elongation at Break

L : 415%
T : 582%

BS2782 : 320A
Tear Strength

L : 122 Nmm-1
T : 96 Nmm-1

BBA Method
Low Temperature Flexibility

L : <−25
T : <−25

MOAT 27 : 5.4.2
Dimensional Stability

L : −2.0%
T : −0.3%

MOAT 27 : 5.1.6
Mortar Adhesion Test

PASS

Cream Method

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