I have just seen your post Tri, I have an 8x6 which I put up myself, it has a Concrete base, the trouble I've with this shed is unbelievable, the tools that have gone Rusty, I contacted Keter At Birmingham along with A4 Pics of the Rust, They sent my a cheque for a £100, I have put 4 Vents into it so that with the Original totals 6, it's the worst bag of cr--p I have ever bought, regards look, it's good, I would contact Keter if I was you along with A4 Pics & seek compo, these shed are made in Israel, I had an issue with the Cross Plastic Beam leaking so they sent me a new one, the Doors Warped so I replaced them, I should have repaired the wood shed I removed, that on never give trouble except the Floor started to rot, regards keter sheds, they should stop where they get made, in Israel, he address for Keter is at the back of the Instruction book.