Can I add this missing protection? RHF is sometimes mistakenly called drip cap, drip edge, cap flashing or z-flashing. My issue is if i use aluminum flashing on top of drip cap, that has to be nailed and flashed before starter goes on Before sealing up the top of the window, I prefer to install a traditional metal cap flashing. One leg of the “L” goes over the window or door brick mold, while the other lies behind the siding that will go above. a) The head jamb of a window is the most vulnerable to water damage. Then place the top piece of flashing tape over the cap flashing and layer the house wrap over the tape. 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. Drip caps are fastened to the sheathing directly above a window and protrude slightly to keep water from entering the window unit. We back caulk the Drip Cap before installing and use "Cap Nails" to install … 3. More on Windows: Drip Cap Design and Installation – The lowly drip cap needs to be taken more seriously to prevent leaks and rot. 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. I don’t want to use J so my plan was to use starter above drip cap. Photos by: Chris Ermides except where noted. siding will be mastic quest vinyl. 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. Flashing for Old Windows – How do you get a good weathertight seal on old windows that don’t have a flange? 8. It should have been a no brainer for the installers. The "Z" Flashing or "Drip Cap" as it's better known by is code. The doors and windows on my home do not have head flashing. We used lead flashing and molded it to fit over the window. If your window has come with a drip cap, now’s the time to install it. This helps direct water out away from 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. There is no metal drip cap over the round window. 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. Install metal cap flashing. RHF is made of steel, aluminum or PVC and is installed on the top, exterior side of a window. That’s why many manufacturers provide drip caps with their windows. https://www.doityourself.com/stry/installing-a-window-drip-cap 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. 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