Wood sleepers or concrete pavers placed directly on the roof surface can restrict the flow of water on a roof system. By installing elevated rooftop unit stands the drainage patterns for the roof are not negatively impacted. Your roof drains more efficiently while helping to prevent roof leaks and vegetative growth on your roof.
By installing the dunnage and elevating the units above the roof surface better access if provided for roofing repairs as well as general cleaning of the roof surface. This can also make your next roof replacement run more smoothly since elevated units are easier to roof around.
Elevating your rooftop units allows air to move around all sides of the unit keeping the unit cooler than if the unit is set on the roof deck without ventilation under the unit. This may improve the performance of the unit by reducing operating temperature. During winter months these stands also help keep your units out of the snow and ice buildup that can negatively impact their performance.