There are several different ways to do around windows and it depends on the type of window and the look you want. We're doing a video next week on this. Windows can be trimmed with US07 deck boards or US09 siding boards or you can just use the dead end trim if you want to.
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Please refer to our downloadable installation guide and you can forego the furring strips.
Yes, it can be installed horizontally.
A bundle of 14 boards, would cover roughly 93 square feet, or about 7 square feet per board.