That wood is very nice for working. However, for Douglas fir to work optimally for strength, it has to remain wet. Douglas fir was used in many a mine shaft, but they were misted constantly with water. If allowed to wet and dry, they lost their strength, and shafts collapsed. It took the mining engineers a while before talking with foresters to learn why some mines caved in constantly - it was drier conditions where there wasn't constant water infiltration and wetting of the wood. There is 55+ year old Douglas fir beams holding strong in underground mines in northern Manitoba, not replaced yet. Jason
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