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White Oak Siding - Whole log or just heartwood?6/8
I'm about to saw nearly 5000 bd ft of White Oak to be used as vertical B&B siding on a new "barn" style house. The guy they've hired to do the siding says just plain saw the logs, sticker and cover the boards, and they'll be good to go (dry enough) in about a month. For boards that are going to be exterior siding, hopefully for decades, don't we want to use heartwood only? Siding guy doesn't think its necessary (I think he didn't factor that into his bid). Ideally it seems they should be quarter sawn to reduce shrinkage across the board, but I guess battens can cover shrinkage as long as it is not too severe. Any thoughts?
QS heartwood is indeed best...more stable and more durable.
Decay of sapwood seldom happens for siding that is kept dry most of the time. Does the house have a good overhang? Are shrubs, etc. away from the house so the wind can quickly dry the wood if it gets wet? Is the wood end 6" or more above the ground? If so, the risk is small.
White oak moves a lot. From very dry after the sun beats on it for a few dry days 5% MC) to soaking wet after a rainy period, you can expect flat sawn or plainsawn to move about 8% or nearly 1/2" for a 6” wide piece. With this movement, it is important to nail only on one edge so that the other edge can move without pulling the nails, etc. QS would move half as much.
Got it, thanks!
I had a lot of boards split out from using two nails. The board will cup in such a way as to straighten out the growth rings slightly. If you nail the boards so that they cup toward the barn (nail head against the side of the board that was closer to the center of the log) the edges of the boards will tighten against the frame.