Mounting Roof Top Unit On Existing Roof

Using improperly designed internal and external isolation springs can increase vibration.

Mounting roof top unit on existing roof.

In the last month we were asked to evaluate two commercial spaces for new rooftop units. There are three options regarding permitting of replacement roof mounted units. Often we are asked to evaluate an existing steel roof structure to determine if it can support new roof top units. And in this one sentence lie the benefits and the detriments we face in the roof curb business everyday.

Standing seam metal roofing offers a durable sustainable alternative to other roof types and can provide maintenance free service for five to 10 decades. Prefabricated roof curbs have been in use since the roof has been utilized for something other than keeping weather out. Units shall be mounted on curbs raised a minimum of 8 inches 203 mm above the roof surface or where roofing materials extend beneath the unit on raised equipment supports providing a minimum clearance height in accordance with table 1510 10. It may also migrate if not anchored.

Never attach roof ashing directly to a york rooftop unit. Renaud de saint ceran subject. Excellent weather just a perfect early morning to replace a york dl10 10 ton pack. Going to be doing a full install.

You can t ask for a better job on a monday morning to start off the week. Tenants frequently remodel commercial spaces for their current needs and in many cases add new air make up units exhaust fans and hvac units. Installer s guide roof curb packaged rooftop units. The primary function of the curb is to keep weather out while supporting flashing the equipment on it.

The usual method is to mount the unit on wood blocking to raise it above the plane of the panel ribs and give it a surface to bear upon. If anchored holes are punched in the roof. Placing the unit on lumber which bears on a sloped roof causes the equipment to sit out of level and operate less efficiently. York does not recommend vibration isolation be pro vided on both the fan skid inside the unit and the curb outside the unit without credible testing results.