Polythene Sheets in Construction

The most effective method of controlling damping is using an impervious vapour barrier on the warm side of the structure. Water permeability is reported in Perms, a measure of the rate of transfer of water vapour through a material. Vapour barriers are tested for water permeability in accordance with the ASTM-E96 standard. Polythene sheets are one of the most effective materials used as a vapour barrier for damping prevention. It has an extremely low water permeability rating of typically 1.7 SI Perms. They can be used in between the insulation material and structure surface to act as a damp-proof membrane. Oversite concrete slabs employ a 1000 Gauge (250 microns) polythene sheet laid underneath the concrete to prevent moisture from being absorbed. The general standard employed for the testing and verification of polythene sheets for use as a vapour barrier is the ASTM-4397.

PACKAGING: 4x25 roll packed in blue plastic cover it comes in three different gauges 500, 1000 or 1200 gauges.

APPLICATION AREA: Polythene sheets are used during building construction to prevent structural damping that occurs when warm, moist air penetrates inside a concrete slab, wall, roof or floor structure, reaches the dew point and then condenses into liquid water.

TESTS STANDARDS/APPROVALS: Our sheets are tested and verified in accordance with ASTM-4397 standards for use as a vapour barrier under concrete slabs, floors and walls. In addition, our sheets are approved and relied upon by a large number of contractors (approvals available on request).