I believe wood expansion is primarily across the grain. More than an order of magnitude difference between radial and longitudinal https://woodworking.stackexc

I believe wood expansion is primarily across the grain. More than an order of magnitude difference between radial and longitudinal https://woodworking.stackexchange.com/questions/5871/which-direction-does-wood-expand https://woodworking.stackexchange.com/questions/5871/which-d... It varies significantly based on wood species.