I suppose the answer relies on in which you hale from. the reference to "hardboard" can be an English phrase which is/was an item like craftwood but softer on a single aspect and tougher on one other. Information: Make Your personal Very small Camper From Scratch: In the summertime http://homemadecampersiding49383.kylieblog.com/9301346/5-simple-statements-about-homemade-camper-siding-explained