Next, turn your attention to the finger-joint jig. The spacing between notch cuts is 11/2". The spacing between the jig pin and the blade is crucial. Make your first cut at the edge of one rail, so the pin isn't involved. In other words, you're making a 3/4" x 3/4" notch in the end of the rail. Now move your workpiece over so it straddles the pin, then make your next cut. If the jig is adjusted properly, this cut will be 11/2" from the inside edge of the first one. Continue until you have all six cuts completed: four in the middle and one on each end.
Repeat on the remaining 11 rails, plus a few spares. All rails are exactly the same-their positions are interchangeable.
Easy assembly
With all of your pieces cut, dry-fit your grate. If any rails are too tight, a pass over a belt sander or some finessing with a hand plane should make the troublesome rail fit. Glued joints would create a strong grate, but considering the fact that you'll be standing on the project, and that even weatherproof glue isn't recommended for soaking in water, I elected to use screws. Galvanized, brass or stainless-steel screws will weather the intended use. I chose the #8 x 11/4" size.
If you're going to apply a finish, such as a penetrating oil, do it now, before assembly. The job is much easier at this stage since there are lots of small corners to deal with.
Make it strong
Assemble the project, using clamps in the corners to keep the rails together while you work.
Don't be tempted to drive in screws before predrilling holes. The rail parts are narrow, and many of the screws will be close to the edge. Without predrilling, your wood will split. I used a 3/32" bit to make pilot holes for the screw threads, and a 5/32" bit to make room for the main body of each screw.
With the project assembled, give the top edges a touch with a belt sander to smooth over any variances in height and smooth the end joints as well. Retouch your finish after this.
This grate was intended for boot washing, but I have also found it useful at the hose bib (there always seems to be mud there), and it could be resized to span an area of deck that would normally block light to a basement window. If you choose the design for a poolside shower, tighten the spacing to 3/4", a more comfortable grid for bare feet.
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