De-Watering Vacuum (DWV)

An old defective waterproof membrane may have many water entry pathways through it. The extent of water entrapped within an existing roof construction is very difficult to quantitatively determine. The water entering the roof construction can cause components within it to become saturated with water. This can cause them to degrade and therefore require to be replaced. It can also, if left, cause blistering of the new waterproof membrane and/or degradation of components within the construction.

However, if they are only saturated and if dried out will not loose strength or cohesion then it is economical viable to use dewatering to prevent blistering of the new membrane.

The entrapped water can be extracted from within existing construction by installing a DWV De-Watering system, which is fully monitored on a daily basis providing computerised updates, and certified on completion.

This system utilizes a graduated vacuum evenly created to draw-out the entrapped moisture from predetermined pump locations. When all the water has been drawn out the pumps are removed and the waterproofing made good.