The flashing goes into the wall about 1" one each side. This adds extra strength to the shelf edge. Once I got the bottom piece in, I installed another piece of flashing on top.

- Two Flashing
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Once the flashing is in place, I use some clamps to squeeze the flashing together. I use a piece of wood on the bottom and top to spread the squeezing force across the whole shelf. I also place a piece of 1x4 across the front for a shelf edge. I drill through the 1x4 but not the flashing. then I use a Truss Screw and screw it into the flashing. This holds the shelf edge in place as well as screw the flashing together to keep the flashing tightly clamped on the foam.

- Shelf Face
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A picture of the shelves installed.

- Complete
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Not shown is that everywhere there is bare foam I installed black indoor/outdoor carpeting. Looks nice and is easier to install than PMF at this point.