wood flooring (making your own)
I have contemplated making my own for some hardwood in the house. I have a sawmill near by that seels kiln dried lumber. I can probably buy a router bit and tongue and groove it, however I am wondering about the bottom. When I look at a piece of hardwood flooring, I notice the bottom of it that lays against the subfloor as two indentations milled into it. What is this for and is it necessary?
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