Counter-flashing caps are typically secured by screws with neoprene washers installed through the side legs of the cap as shown in Figure 2. B Perimeter Using R. Changes in Roof Slopes 9. Using a draw band on a square steel post, for example, will be very tight on the corners, but on the flat sides of the post the flashing will not be tightly clamped. Roof penetrations can be categorized by whether the roof is sloped or flat. The sides of the skylight are flashed similarly, except that a water diverter is not used.
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Case Studies RoofScreen Mfg. Since the washer is completely contained within the undercut, and the outside edges of the bolt head are in contact with Base Cap, the washer cannot be over compressed and is never exposed to the environment or UV light. Another major concern is weight. With sloped roofs, the general approach is to attach the flashing before the roofing is installed. The copper base flashing extends a minimum of 6" onto the roof in all directions. 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. Buildings protect us from weather and keep us warm, dry and safe.
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Wind is a powerful force and anything with surface area acts as a sail. Many years ago the common material for this was coal tar pitch, thus the name pitch pocket or pitch pan. However, adding heavy ballast, restricting water flow or leaving unattached equipment exposed to wind forces can seriously compromise building safety. T Termination with Termination Bar. If the roof is under warranty, the contractor may need to be certified by the roof material manufacturer.
This sleeve runs up to the top of the vent pipe. The blocks are retained by a metal tray which sits directly on the roof membrane, leading to premature failure. Not only could equipment completely tip over or even blow off the roof, there are other less obvious problems that occur. This is an example of a ballasted solar array on a large flat roof. Collateral damage, business disruption, liability, lawsuits and reputations are at stake.