Even if you build your projects to accommodate wood movement and choose the best materials for each part, there will be times when you’ll need to be more exact in your estimates. Armed with these handy charts and formulas, you’ll be able to estimate how any given piece will expand and contract with seasonal changes in humidity.
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Is there any chance of supplementing the information in this very useful article by making a map that combines the data in the two maps on page 85? This third map would plot the difference between average high and low moisture content for location. One could move straight form the third map to the chart on page 86.