![]() Failure to follow the manufacturer’s recommended guidelines could result in the warranty for the roof being voided. Likewise, it may not be advisable or possible to set the rooftop HVAC unit directly on the roof, especially if the building has a membrane roofing system. ![]() In general, the heaviest part of the packaged HVAC system should be placed over a roofing beam to ensure the unit is adequately supported and to prevent unintentional damage to the roofing system, like sagging and tearing, which could result in roofing leaks. The commercial HVAC contractor must also become familiar with the type of commercial roofing system and the manufacturer’s specifications for installing roofing curbs and performing roofing penetrations. This includes calculating the load the unit will place on the roof and determining the best location for the rooftop unit. ![]() Commercial HVAC Rooftop Installation ConsiderationsĬommercial HVAC rooftop units require special considerations and calculations prior to being installed. Correct HVAC placement along with support struts can help protect your new HVAC system and your building’s roof so that you get the maximum expected useful life from both systems. Unfortunately, an improperly placed and installed packaged rooftop unit can lead to roof damage, including punctured membranes and sagging that could lead to ponding water and leaks. Rooftop units are an extremely common setup in HVAC systems for commercial buildings due to their ease of installation, good energy efficiency and ability to provide heating and cooling in one unit. ![]() Correctly Placing HVAC Units on Commercial Rooftops ![]()
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