11.   Use galvanized roofing nails for all fastening, and make sure they are long enough to penetrate the wood sheathing.

12.   Work a new shingle back in place under the overlapping shingles, fasten it with galvanized roofing nails and seal the heads with cement.

13.   Investigators found the platform was seriously flawed in its design and construction, with only galvanized nails holding it to its foundations.