Unfortunately, this roofing option and the maintenance freedom it affords is often sabotaged when it comes to mounting essential rooftop equipment and ancillary mechanicals. The cap flashing is attached to the pipe with a draw band. The composition flashing is brought up the cant strip and blocking, at least 8". Changes in Roof Slopes 9. To learn more, visit www. How do you cut away the wood roof decking and not the metal roofing? One of the most basic design elements to be considered for effective roof attachment is flashing height. Frame mounted HVAC unit using pipe supports extending down to the building structure and flashed through the roof using rubber pipe flashings Round Penetrations Round shapes, such as plumbing vents or pipe supports for rooftop equipment, should be flashed through the roof using EPDM Ethylene Propylene Diene Monomer rubber pipe flashings.
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9.9. Roof Penetrations
For more in-depth information on proper roof attachment design, a very good resource is the National Roofing Contractors Association www. Long Pipe Flashing This detail is used for pipes that continue above the roof, and cannot be flashed as shown in Detail 9. If the roof is under warranty, the contractor may need to be certified by the roof material manufacturer. Penetration-Free Attachment Standing seam metal actually offers advantages over other roof types when mounting of ancillary fixtures does become necessary. You have to give them something good to work with, which leads us to the second rule. A copper cap is placed over the exposed edges and is soldered to the sleeve. The sides of the skylight are flashed similarly, except that a water diverter is not used. Technology In Restroom Maintenance.
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WEB EXCLUSIVE: Penetrations Through Standing Seam Metal Roofs
The edge of the copper flashing is brought over the top of the curb. And while facility managers would prefer an uncluttered roof, it is sometimes necessary or convenient to mount HVAC equipment—as well as screens to hide it, piping to fuel it, scuttles to access it, and walkways to service it. Using an inferior method of mounting equipment to avoid roof penetrations may solve the waterproofing concern, at least for the short term. Consequently, holes in the roof are inescapable. The pipe flashing must be anchored to the roof panel only, and not to the building structure or deck. Frame mounted HVAC unit using pipe supports extending down to the building structure and flashed through the roof using rubber pipe flashings Round Penetrations Round shapes, such as plumbing vents or pipe supports for rooftop equipment, should be flashed through the roof using EPDM Ethylene Propylene Diene Monomer rubber pipe flashings. Mechanicals can be secured safely and cost effectively to these seam clamps leaving the roof membrane free of penetrations. Duro-Last Roofing Systems offer proven chemistry and decades of sound performance.
Description:The base flashing extends onto the roof a minimum of 4" and is soldered to the ventilator. This curb is to be installed with an HVAC system. In fact, roofs are full of penetrations. Keep reading to see why this may be the wrong approach The minimum weight for copper sheets used in flashing roof penetrations is 16 oz. Roof penetrations can be categorized by whether the roof is sloped or flat. A secondary flashing made of metal or neoprene rubber, commonly called storm collar, should be installed above the band and caulking to help shed water to the outside and protect the caulking from weather and UV light. But in almost all cases, properly designed and installed roof penetrations are exactly what you want. A rubber storm collar would have greatly increase the life and water tightness of this detail.