How to prep for installing an exterior door by making custom metal flashing. Pro builders, Erik and Jaime Perkins, explain how to build better homes by build. When you install a window in new construction, the building wrap overlaps the self-adhesive flashing. In a remodeling job, a simpler arrangement is often used: Self-adhesive flashing strips are applied along the bottom, then the sides, then the top. Then small pieces of flashing. Measure both the door and rough opening to make sure the door is the right size. Tip: Installing an exterior door that is insulated and made of steel can be heavy and cumbersome due to the weight of the materials. If you choose to install a front door made of steel, you will need a helper. Selection and installation of peel-and-stick flashing membranes used on building exteriors. Peel and stick flashing tape: this article describes the selection and installation of peel-and-stick flashing membranes used on building exteriors to seal housewrap joints and to seal against air or water leaks around windows, doors, or other openings.
TRANSCRIPT:
The first steps in the process involve prepping the rough opening. The carpenters have to fill in the extra pieces above the window to flush things out.
Dave: 'We like to install windows over a sloped sill, so we use beveled siding. I'll put a couple of nails in there to hold it in place because we will be shimming the window on this and putting a peel-and-stick membrane on it.'
Some tapes can stretch around corners, but Dave’s going to demonstrate with a standard, non-flexible flashing tape.
Dave: 'You see there's a little piece of plastic inside, like a fishing line.'
First, he splits the release sheet.
Dave: 'Pull that out.'
He works from the center out to either side, keeping the flashing tape along the inside edge of the window.
Dave: 'Later on we're going to put 4 inches of foam on this house. So we'll put another piece [of flashing] on; we want to be able to go out over the 4 inches of foam and turn down.'
How To Install Prehung Doors
Now we can cut the tape—not quite all the way, which leaves a little bit to stretch.
[INSTANT REPLAY]
Dave: 'I'm putting 2 inches to the outside and the rest is going inside.'
Dave wraps the corner, putting only as much peel-and-stick inside the rough opening as the depth of the window. He cuts the bottom, but again not tight to the corner so he can bend the tape around.
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Dave: 'The corner is the weakest point—and we've crossed it twice. Then we can put another little piece on that will go over it again. Even though this would be kind of like a reverse-flash, it is already flashed. It's not really a reverse-flash.'
We're giving the corner, the weakest point, triple coverage.
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