Wondering about making a panel of 1x4s screwed together side to side. What length screw is needed? I have 1 1/4" but worried about being too long. Thanks!
1-1/4'' is the suggested screw to use in 1x stock (measures 3/4'' thick).
Course thread for soft woods, and
fine thread for hardwoods.
NOTE: make practice piece assemblies before proceeding to your final project.
Make sure you use some glue too. It will make a better panel.
I would use pine boards they flush nicely