Originally Posted by crunch27
Has anyone installed their planks across their trailers? Wouldn't that minimize the contractions and expansions going across the aisle at 3' more so, than going length wise at 20'?
Expansion and contraction due to temperature changes is not the only factors to consider. There is also flex of the trailer frame during towing, and that is a much more severe condition than mere temperature changes. If you plank crossways as you suggest, you have a lot of seams that will be opening and closing with every bump and pothole.
Plus, wood bends more easily with the grain than across the grain. If you try to bend it cross-grain, it splits.
Finally, if you plank crossways, you expose a lot more end grain because you've got over 40 feet of end grain (two sides at about 20 feet of length each) versus a mere 16 feet of end grain (front and rear) if you go lengthwise. Since the end grain is where you get the most water penetration into the wood, the planking will rot more quickly.