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Home » Products » Sealing and Installation technique used » State of Art Sealing Technique

State of Art Sealing Technique

State of Art Sealing Technique
State of Art Sealing Technique
Product Code : 04
Product Description

Polythene or polyethylene sheet is commonly used as a damp-proof membrane with oversite concrete for all but severe conditions of dampness

Where site conditions are reasonably dry and clean, the overlap joints between the sheets are sealed with mastic or mastic tape between the overlapping sheets and the joint completed with a polythene jointing tape.

For this lapped joint to be successful the sheets must be dry and clean else the jointing tape will not adhere to the surface of the sheets As clean and dry conditions on a building site are rare, this type of joint should be only used where there is unlikely to be heavy absorption of ground moisture. Where site conditions are too wet to use mastic and tape, the joint is made by welting the overlapping sheets with a double welted fold , and this fold is kept in place by weighing it down with bricks or securing it with tape. The double welt is formed by folding the edges of sheets together and then making a welt which is flattened.

The plastic sheet is effectively impossible to fold and so stiff and elastic that it will always tend to unfold so that it requires a deal of patience to fold, hold in place and then contrive to fold along the joint. By using the maximum size of sheet available it is possible to minimise the number of joints.

At the internal angle of walls a cut is made in the upstand sheet to facilitate making an overlap of sheet at corners. These sheets which are commonly used as a damp-proof membrane will serve as an effective barrier to rising damp, providing they are not punctured or displaced during subsequent building operations.

We use Automatic Sealing / Combi-wedge welding machine with stepless adjustable temperature and drive manufactured by M/s Leister Technologies, Switzerland as also hand sealing machines for welding joints and cross overlaps.

The above state of art hot air blow sealing machine which we would be using,  weighs approx. 6.5 kgs and operates on a voltage of 220-230 volts. 

The temperature of the machine is digitally controlled with a max. heating upto 600 deg.C.

The salient features of the machine are as under:
  • Low weight
  • High welding speed
  • Stepless adjustable temperature and drive
  • Even under harsh environmental conditions perfect welding results


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