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Questions dealing with the movement of wood due to weather and seasonal changes.

Wood expands and contracts, swells or shrinks due to changes in the local temperature and humidity which cause changes to its moisture content (MC). Wood shrinks as MC drops, swells as MC rises.

This tag is for questions relating to dealing with it for different projects. Techniques and best practices.


  • The Sagulator website app helps determine the amount of sag you can expect for specific species, sizes, and spans of wood shelves or table surfaces.
  • This web page from Popular Woodworking discusses the nature of wood movement and how to calculate the amount of movement to expect on your project.