A. The relative humidity greatly affects the strength of the joint. However, within 24 hours, the strength is completely established, so the storage process has no effect on strength. However, humid storage conditions can cause the wood to gain moisture and swell; dry conditions can cause moisture loss and shrinkage.
The stress caused by swelling or shrinkage can stress the joint and cause failure if the joint is not very strong. The problem is not the storage (or even the in-use conditions if the failure occurs later), but that a poor joint was made initially. Many poor joints result because the wood is not glued immediately after machining. The choice of adhesive has little effect, as all adhesives can make a joint that is stronger than the wood itself.MARK To minimize storage related shrinking or swelling, the ideal storage conditions in most cases would be 38 percent RH, as this is close to the average RH of most customers.
Sycamore and wormy maple ranked highest in customer rankings of underutilized species.
Understand the differences in appearance, behavior and price
Q: We are having a problem with shrinkage. We make furniture, but someone else sells and delivers it. This person claims he did everything correctly, including opening the furniture wrapping (we wrapped the furniture with shrink-wrap and it was fairly well sealed) and letting it acclimate to the house climate. When the customer moved in, they said the furniture looked really wonderful, but within a week, it started to warp, open joints and crack in a few places. We are so careful to keep our plant at 40 percent RH and check the MC of the lumber. This is frustrating! Can you help?
Q: We are using southern yellow pine for furniture and
have been getting what looks like lengthwise shrinkage. However,
I was always taught that wood does not shrink along the grain.
Can you help please?
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