I am planning to roof an outbuilding with used corrugated 'tin'. The used sheets I have are so thin that they buckle when stood on. I was planning to just double layer it to provide more strength. However, a carpenter advised against this, saying that bad rust would form between the sheets. I don't see how that would happen if no water gets between the sheets. What do you say? Thanks.
Raymond Ryan
2010-03-18 21:33:54.000000
Items will rust in the absence of bulk moisture (i.e. rain).
If the substrate is subject to oxidation, you will get that between the courses of panels as a result of atmospheric humidity and an inability of the space to dry to outside.