Collars manufactured from PVC are also available, for installation as part of a full PVC waterproofing membrane systems. They are fitted around the outside of the pipework which emerges from the top of the concrete deck, things such as foul air vents and stand pipes. Obviously it is important that the small cavity between the cast concrete and the HDPE pipe emitting form the hole is fully sealed, which is why collars are fitted over the whole area and bonded to the waterproofing membrane.

The collars will fit around the outside of an HDPE pipe (as opposed to the connectors and outlets which slot into the inside of a standard water pipe) and are secured using a jubilee clip supplied by Wallbarn. They are manufactured in a slightly conical shape, so that they are easier to fit, and also help direct water outwards away from the pipe and onto the horizontal plane.

As this is a PVC system the collar will be fully bonded to the PVC waterproofing membrane with heat.

The flange of the collar and the membrane beneath are torch-heated until soft, then the two elements are pressed together so that they adhere to one another.

It is essential that the correct size of collar is chosen, as it needs to fit around the outer diameter of the HDPE pipe snuggly as gaps may cause the system to move.

The jubilee clip is fixed around the collar at the top end to secure the whole area at the end of the process.

See the CAD images here

Measurements:

H is the height of the collar

D1 is the outer diameter of the flange or surrounding ring

D2 is the inner diameter of the collar at the bottom

D3 is the inner diameter of the pipe at the top which needs to be larger than the outer diameter of the HDPE drainpipe

Installers will also need to buy Jubilee clips for all collars found in our Accessories section