Timber grid backer board
Now that I have my final timber layouts for the main facade and side addition front, and have had some time to consider the overall construction, I'm ready to cut my grid backer boards. I bought a 30" x 48" sheet of 1/8" thick plywood from the local Woodcraft store. This thickness is not easy to find in large sheets, at least not locally. They had only this one in stock.
There was a lot of math involved, but it worked! There is 3/8" on either side of the grid to accommodate the finished side walls. The wood of the grid is warped in places, but the filler pieces should take care of that.
I won't cut my openings until I am further along in the build and ready to attach the grid/filler assembly to the backer board.
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