Why do we have suspended timber floors? Drop panels act as T-beams over the supports. The problem with this is that nailing to close to the end creates splits which can undermine the fact that they are enginered. 1. Piles make of metal, concrete, or timber. Advantages of Reinforced Concrete. Wood may be sustainably sourced, but a lot isnt. She has a doctor of Philosophy (Computer Engineering and Technology) Ph.D., a Master of Engineering (Computer) M.E. //