Tuff shed inc. 1777 s harrison st denver, co 80210 1-800-buy-tuff. We got our shed installed. the day of installation when doing the roof i asked if they are using felt before shingles and he said no..not on these.. Spokane moving a storage shed building step foundation tuff.shed.storage.sheds small wooden storage shed in moyock nc how to build steps for a garage building a cheap storage shed flooring- for that base of the shed you are able to have it manufactured by wood. if perhaps the floor is wood make bound to make involving a treated lumber..