I did the shiplap on my flatbed trailer years ago (because the boards came that way..
The board grooves held water and debris and the bed rotted out just as fast as a pine board bed before it did.
I would have been better off just ripping the shiplap off and leaving a gap.
Hope your experience is better than mine was...
Posted on Aug 4, 2012, 9:41 PM from IP address 188.8.131.52