and accordingly they can have any length just as the walls 12 and 14 can have any appropriate size the numerous studs making up the walls 12 and 14 have been omitted and only two are shown for sake of simplicity the studs top and bottom plates and all other components in the walls 12 and 14 thus comprise a portion of the structure and are particularly important in that they hold the planking in place as shown in fig1 the external surfaces of the walls that will be seen when completed are formed of first and second planking layers 16 and 18 affixed to the wall stud 10 39 by means of nail 41 they can be horizontal planking such as 61 4 34 u00d7 12 39 or 81 4 34 u00d7 12 39 construction they can just as readily comprise vertically deployed composite sheets typically 4 u00d7 8 plywood particle board and other external surfaces can also be applied however it is of great significance that the fiber cement composite materials have been quite successful recently and are markedly improved in performance at a competitive cost compared to wood and therefore that will be used as an example to explain the context in that light the fiber cement components whether individual planks or in sheet form and whether deployed horizontally or vertically will be assumed to constitute the planking 16 and 18 in.