Originally Posted by rossvtaylor
When I saw the post title, I thought...oh no, you want shiplap not T&G. It's exactly because of the issue you're having.
You can cut off the bottom of the U in the groove edge of the board, to make it a shiplap style. That would require either a table saw or a router.
Hmm.. I could have sworn that I'd read t&g. Oh well.. easy enough to fix.
Now I feel really intelligent. Lol
At least I have the tools handy to fix my mistake.