Building a Cedar Window Box


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Step By Step Instructions


Cut the side boards to 25 3/4″



Cut the end boards to 6″, once the rabbets and dadoes are cut this will give the box an over all width of approximately 7 1/4″ which is the width of the 1×8 board.


Set your table saw miter for a 10 degree angle cut.


Cut the 10 degree angle into your side pieces. Ideally you should stack them and make the cuts at the same time, this would ensure everything remains the same size. Unfortunately raising the blade that high on my particular brand and model of saw occasionally causes problems. So I just be as precise as I can be.


Stack your dado blades to equal 1/4″ and set the cut 1/4″ above the table. Cut the dado into the angled side of the front and rear boards.


Raise your blades to just a little more than half the thickness of the wood. Install a sacrificial fence onto your table saw and slowly move it into the spinning dado stack. Not to far just enough where you have just started cutting it.


Cut your rabbet and check your fit, it should be way to big. Slowly move the blade height up (test fitting between each adjustment) until your rabbet locks into your dado just enough so gravity won’t pull it out. Once this is done, make the rest of your cuts.


If you want to fancy it up a bit, you can cut a few lines in the front with a router, just keep in mind that your dadoes are already 1/4″ deep. The maximum depth you should cut is 1/8″.

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Dry fit your parts together and place them on your base board. Take a pencil and trace the bottom of your box onto this board.


Using your pencil lines cut the base to length and your dadoes approximately half the thickness of the board deep.


Glue and clamp the window box together and let it dry.


Spray lacquer the outside and put 3 very generous coats of poly on the inside. I poured a cup of poly in and wiped it around with a rag for each coat. Neatness doesn’t count, just make sure your cover all your surfaces.


In the cut and materials list document there are plans listed for wooden supports. These supports will work fine on a wood sided house. If your house is brick I would use metal supports, the wooden ones may work but I would put a gasket beneath it. If your house has siding either vinyl or aluminum I would ask around, check the internet and YouTube for the best way to mount something to an exterior wall. No video or instructions on the mounting as it will be different for every house. Just remember you are putting holes in your house for any mount, so seal them up good against weather and critters.

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