The SRS Deflection Monitoring system is superior to other methods of measuring snow loads for several important reasons:
Measuring the deflection caused by accumulating snow & ice is considered to be the reference standard by experts for observing roof loads, and considered more accurate than inferential sampling techniques.
Snow Weight Equivalent (SWE) measurements, or the use of roof top scales is not a direct measure of the overall stress that accumulating live loads (snow & ice) can have on a structure.
Weighing snow does not account for the effects of structural variation or defect
DMD1000 sensors are mounted under the roof deck
Protected from weather exposure and snow removal actions (damage caused by shovels and rakes)
Roof top mounted sensors are susceptible to freeze up & ice bridging. A typical roof can have several inches of ice under the snow during the winter months. Sensors captured in roof top ice build up can not measure accumulating snow loads
DMD1000 roof sensors are connected directly to the control panel
No annual battery replacement cost
Continuous & automatic device status reporting to central panel
The DMD1000 sends alarm email notifications directly from the control panel
No need for expensive monitoring & notification contracts
ROI for DMD1000 installation
Knowing when and where to remove snow from your roof can save a lot of money every year. Costs to remove roof snow can range from .65 to 1.50 per sqft depending on conditions, equipment requirements, and labor needs.
Based on the example of a typical box store (80 to 100,000 sqft) - avoiding just one snow clearing can save as much as $150,000.00. The resulting ROI for a DMD1000 deflection alarm from Safe Roof Systems can be as short as a single winter season.
Roof Snow Removal COST PYRAMID
A cost pyramid represents the layers of work & associated costs that combine when snow is shoveled from a roof. Each snow removal action requires the process to be repeated.
Cost savings are significant each time a snow removal action can be scaled down or avoided all together. A SRS Roof Deflection Alarm system will tell you when & where roof snow removal is required and help control the scale & number of these cost pyramids each winter.
The aggregate costs of a single roof snow removal action grow to include the costs for contracted roof labor & ground crew, appropriate heavy equipment requirements, and the added costs of spring maintenance.
Clearing roof snow can be expensive
Architectural features, like parapet walls and access around the building foundation can have a significant impact on the over all cost of roof snow removal. Lifting snow over the side of a parapet wall often will require a crane and suspended hopper. Snow piles that are left against a foundation or exterior wall can cause a great deal of damage as it melts.
Safe Roof Systems can help you evaluate your individual needs and recommend a system that can help you safely plan for the worst of each winter season.
The Risk of Roof Collapse
If you have ever wondered whether you should shovel your flat or low-sloped roof, you should consider whether monitoring roof deflection would be of value. For surfaces of as little as 10,000 s.f. the cost of monitoring may well save you significant money over a very short period of time.
Each year more than 3,000 roof collapses - and more than 20 associated deaths - are encountered in the US alone. The cost, recovery time, shipping delays, and lost business associated with a roof collapse can force an otherwise successful business out of business. Without proper safeguards, the incidence of roof collapse is likely to increase in the years ahead.
Why? Live load codes changed from 28 to 35 pounds in 1975, and to 40 pounds in 1982. Many buildings constructed before 1976, therefore, do not meet these basic requirements. Further, these non-conforming conditions are exacerbated when a new roof is applied - especially one with added R-value - or when hanging displays or conveyors are added to the interior trusses.
Even newer buildings can use the DMD-1000 - especially during severe weather. Even though climatological conditions have modified the intensity of storms considerably, none of the building code agencies in the US (BOCA, ICBO, and SBCCI) have updated roof load requirements related to 100, 50, and 20 year storms within the last ten years. So, even if a roof conforms to the most recent codes, it may be in jeopardy during severe storm-loading. Even further, the world's largest liability insurance company, FM Global, has redefined snow and water as dead-loads, further increasing the structural requirements of new buildings. Buildings built as recently as 2006, saw collapse in this past winter. If failure is not an option, you need Safe Roof.
Safe Roof Systems does not increase the load capacity of your roof, but it does serve as an early warning system that alerts you when roof loads are approaching a critical stage. Further, our systems tell you exactly where the problem exists so that you can target your efforts only where needed - saving many thousands of dollars in the process. Having this kind of information will help reduce the incidence of roof collapse in the years ahead.
For more information about roof deflection monitoring and how to avoid roof collapse please call us or email us today
Safe Roof Systems Inc. 13 Industrial Drive Mattapoisett, MA. 02739