LEAKS UNDER OVERBURDEN
The Music City Center in Nashville had a problem. There was leak right in the middle of one of their largest show rooms. The staff responded the way staff usually respond.... go get a trash can and place it under the leak. Not the best look for clients who pay big money to display their products at such a prestigous place. To the credit of the general contractor, a Gaussan Technology On-Demand Low Voltage Vector Mapping system had been put in place under the extensive green-roof.
The roofing company attempted to find the leak on their own digging up overburden including paver-stones and retaining strips in the area where the leak was manifesting itself inside the building. This failed as the roof had a signficant slope with an extensive array of conduit running along the ceiling which offered plenty of migration possibilities for the leak to travel.
Thanks to the previously installed On-Demand Low Voltage Vector Mapping, a Gaussan technician was able to pinpoint the penetration to a very precise location. Instead of excavating a large area of green roof, only an area of about 2 square feet was dug up and the penetration was located without much time or effort expended.
At City University of New York Science and Research Building, what you see is not even close to what you get. Most of the ground-breaking research takes place underground... under the commons area between the two buildings. This research has to be protected and can ill-afford an interuption of work. Gaussan Technologies was hired to put in a Real-Time Leak Detection System that will monitor the underground facility around the clock.
MEMBRANE UNDER MECHANICALS
Roofs with massive amounts of mechanicals can be real maintenance nightmares. The more mechancials means the more work that takes place upon the roof which can translate into more damage during the construction process. But how do you test a membrane under a mechanical you cannot reach? Vector Mapping is the only solution. Gaussan Low Voltage Vector mapping can see where you can even get to so that penetrations can be verified BEFORE costly work is started. The roof pictured here at Capital Towers in Chapel Hill, North Carolina, is a veritable "money-machine", housing cell towers, city communication networks, and much more. It was critical to to be able to test underneath these structures without an interruption in serivice. Vector Mapping made that possible and verified that no leaks were originating from underneath the mechanicals located on the roof.
Flood-Testing vs Electronic Testing
As is the case in most projects time is of the essence. This New York City project was no exception. The membrane had to be certified and it had to be certified quickly so that other work could be finished. Electronic vector mapping was the solution and testing was about to begin when voices of the past reared their heads and insisted upon flood-testing. Explaining to them that electronic testing was a replacement for flood testing and that it could be conducted much quicker than flood-testing fell on deaf ears. Flood-testing would be performed BEFORE electronic testing.
The dams were built, the drains plugged, the faucets turned on and 12 hours later the roof was covered with water. Unfortunately that night temperatures plummeted to 28 degrees. The water froze. It wouldn't unfreeze for an entire week. Both time and money were lost. Once the roof thawed it was pronounced that no water had infiltrated the facility and that the flood-testing, although producing costly delays, was successful. However, Electronic Low-Voltage Vector Mapping was then performed and 7 penetrations in the membrane were found along with a substantial amount of water that had found its way into the envelope. In truth, flood-testing only tests the ability of a roof "deck" to hold water. It does not test the integrity of the membrane.
Electronic testing when compared to flood-testing is not only faster, but is a much more complete - not to mention efficient - way of testing the entire roofing envelope.