I was going to replace my weather boards but couldn't find anyone to make them. So I am refurbishing them (even though they looked hopeless). Used teak cleaner and sanded like mad. Now on the fourth coat of varnish and cannot believe how good they look. But, I had to measure to make a temorary weatherboard. The bottom measurement is 24 inches. The sides are 25-1/2 inches and the top measurement is 27 inches. However, the top of the weather board is cambered and I do not have the camber measurement. Hope this helps you some.