In this type of installation, seal the cap flashing directly to the sheathing with high-quality sealant. siding will be mastic quest vinyl. The Drip Cap should have been installed over the top nail fin tape, just before they flip the house wrap down and tape it off. RHF is made of steel, aluminum or PVC and is installed on the top, exterior side of a window. We used lead flashing and molded it to fit over the window. The drip cap attaches to the sheathing above the window, and then a strip of flashing tape is applied over the nails used to attack the drip cap. The "Z" Flashing or "Drip Cap" as it's better known by is code. Install metal cap flashing. Photos by: Chris Ermides except where noted. Mike Guertin: Head flashing prevents water from leaking in at the joint between the bottom edge of siding and the top of the head trim. Can I add this missing protection? RHF is sometimes mistakenly called drip cap, drip edge, cap flashing or z-flashing. It should have been a no brainer for the installers. —David Wolf, via email. That’s why many manufacturers provide drip caps with their windows. There is no metal drip cap over the round window. My plan is 5/4 azek skirt board with either azek drip cap or azek water table trim. https://www.doityourself.com/stry/installing-a-window-drip-cap Drip cap is an L-shaped flashing that goes over windows and doors after they're installed (but before siding is installed) to prevent moisture from seeping in from above. The doors and windows on my home do not have head flashing. When a window with the integral J is installed , how are you going to install a premoulded drip cap or bent “Z” flashing at the top. Rigid head flashing (RHF) works in conjunction with window flashing, weather resistant barrier (WRB) and the cladding to keep water from finding its way inside a building. This is often impossible to do so as a back up we install flashing behind the joints and drain the water out from behind the siding and on top of a lower section of siding. More on Windows: Drip Cap Design and Installation – The lowly drip cap needs to be taken more seriously to prevent leaks and rot. This helps direct water out away from window. 3. Before sealing up the top of the window, I prefer to install a traditional metal cap flashing. Flashing for Old Windows – How do you get a good weathertight seal on old windows that don’t have a flange? a) The head jamb of a window is the most vulnerable to water damage. If your window has come with a drip cap, now’s the time to install it. One leg of the “L” goes over the window or door brick mold, while the other lies behind the siding that will go above. 8. Drip caps are fastened to the sheathing directly above a window and protrude slightly to keep water from entering the window unit. 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