Ductwork roof penetration detail

These bolts are specially machined with an undercut shoulder. The one on the right uses a separate copper cap flashing, the one on the left uses a single sheet of copper for the base and cap flashing. Sketches shown are only for illustration purposes only and not intended to represent actual roofing details. This tape is formed into an "L" shape, and applied over the flashing on all four sides of the curb, to fully cover any copper. Copper flashing laps over the composition flashing a minimum of 4". Keep reading to see why this may be the wrong approach

To access the combo box on this page please perform the following steps. However, adding heavy ballast, restricting water flow or leaving unattached equipment exposed to wind forces can seriously compromise building safety. By joining you are opting in to receive e-mail. And yes it should go under on the upward side and over on the downward side. Quick and easy, instant airsealing for wire penetrations that is long-lasting, highly flexible and adaptable. Is shorter than the underlaying conduit by about the length of the duct s roof ration stack is suspended from an overhead beam or the like through an array of sheet metal. Collateral damage, business disruption, liability, lawsuits and reputations are at stake.

Division of Technical Resources Title Block 8. Copper flashing laps over the composition flashing a minimum of 4". If the shape of the flashing is such that water does not flow freely, a cricket is constructed on the high side of the flashing, similar to the one in Detail 9. You need to consult with an architectural sheet metal shop, or a roofing specialist. Methods used to make penetrations watertight fall into 3 basic categories: