Differential pressure testing is a critical procedure in evaluating the integrity of roof membranes. It is used when traditional electronic leak detection of waterproofing membranes is not possible, often as a result of a particular roof construction. This could be due to the membrane being conductive, EPDM for example, or where the substrate is non-conductive, such as timber.
The differential pressure testing process involves applying negative pressure through a Perspex chamber placed on the surface of the waterproofing and monitoring the laps within the chamber for integrity. A surfactant applied to the laps will indicate where a water path is present which can then be marked on the roof surface and repaired by the contractor.
Here are some reasons why differential pressure testing is a valuable asset for waterproofing roof membranes:
1. Accurate Detection of Leaks: Roof leaks can be challenging to identify because water can penetrate the membrane in one area and travel a considerable distance before showing up inside the building. Differential pressure testing can accurately detect even the smallest of leaks by creating negative air pressure on the outside of the waterproofing membrane and positve air pressure beneath. Any holes, tears, or punctures in the membrane will cause the air to escape, which can then be observed through a perspex chamber.
2. Cost-Effective: Repairing a leaking roof can be expensive, especially if the problem is not identified early enough. Differential pressure testing can help identify potential problems before they become major issues. This process can save building owners, contractors and roofers considerable expense in repair costs by identifying leaks early and allowing for prompt repair.
3. Manufacturer Warranties: Many manufaturers require roof membranes to be tested for intergrity by an independent party . Differential pressure testing is an excellent way to meet these requirements and ensure that the roof system is performing as intended.
4. Verification of Installation Quality: Roof membranes are often installed by a variety of contractors, and their workmanship can vary greatly. Differential pressure testing can help verify that the installation was done correctly, and the roof system is functioning as intended.
5. Peace of Mind: Roof leaks can be stressful and disruptive to building occupants. Differential pressure testing provides peace of mind by ensuring that the roof system is working correctly and there are no hidden leaks that could cause problems in the future.
Thornton Consulting has a team of experienced field
testers and consultants providing an efficient and comprehensive building leak
detection and consultancy service for clients throughout the UK and Ireland. Call us today on 01342 410508 or use the Contact form to get in touch.
