I know the real reason...but it's a secret.
OK it isn't a secret.
...has nothing to do with shipping...end user always pays that anyway....the added tooling and setup wouldn't be worth the savings.
...has nothing to do with the machinery.
it has everything to do with controlling cupping without the need to worry about grain orientation. ....same if its flooring, siding or cedar decking.
The back kerf is wider on some crown and base mouldings to make installs easier on non flat surfaces....althought it makes it more difficult when drywall has a gap at the floor.
Last edited by mics_54; 01-27-2013 at 03:54 PM.