« Reply #1 on: February 23, 2021, 04:44 PM »
Your problem is not shrinkage but warping as every wood will warp a bit while drying. Even restrained one.
The warping reserve so you can plane/joint it later is way bigger compared to the shrinkage reserve you may need.
1/4 on each side for softwood is a safe bet, less if you have a way to restrain the wood well while drying or it is some quality hardwood which warps less

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