Orientation of grooves, is there a standard ?

[kulas44]

Is there a standard or normal practice for orienting the grooves in tongue and groove or splined/beaded wall coverings in the interior of boats. I have mostly seen them running vertical on bulkheads and walls. The hull ceiling seems to usually be for and aft. How about on the exterior, like on a trawler cabin or pilothouse. Shiplap would seem to shed water better ran horizontally. T&G that I've seen has been vertical. Thanks.

[paladin]

There may be other reasons, but I could not remember seeing horizontal planking on the house of a boat....so......I looked through several designers catalogs.....and found none. It seems that the planking if used on the house is installed vertically on the cabin exterior or the cockpit area, horizontally on the hull ceiling and vertically on bulkheads........could it be a visual problem?

[rbgarr]

My guesses: T&G on interior bulkheads runs vertically so moisture can 'drain' or be wiped down more easily. On the outside of cabins or in cockpits it can fit around curved surfaces without steaming and edge setting (if even possible) for appearance's sake. Hull ceiling isn't T&G and it's easiest to spring the slats in across the frames.