My problem was wind - that big storm back in the spring. A freak gust lifted the 4th floor roll-off roof straight off, over the house and into the street, where it experienced spontaneous disassemby.. This was followed by some running about and moving stuff while the rain was pouring in. Fortunately I had a few packs of the thin (decorating) poly sheet in the obsy as an emergency rain cover. Next day I boarded it as a temp measure, then came lock down, builders merchant shut, instructions to put myself under house arrest and the price of polycarbonate sheet went through the roof (if you could even get it). I never found my wind gauge. I did contact my insurance provider and they sent someone round to have a look, who thought it was an "external door" and needed a lock. I did point out that anyone who had a helicopter wouldn't be interested in robbing me, but agreed to fit a lock. Eventually I decided that making a claim wasn't economic as the only thing that seemed to be damaged (apart from the lid) was the wind gauge and one old SLR.
This week I put a newly built lid on, with even more tie-down options than the old one. While at it, I installed a locking mechanism. Then I decided that the roof needed another coat of waterproofing. So, up on the obsy roof with tin of stuff etc. At some point I needed to close the roll offslightly and forgot about well-oiled rollers and the locking device - CLICK!
Mmmmm....four floors up, on a flat roof with a locked roll-off skylight having a lot of cunning self-locating pins holding it down against serious storms. Fortunately, I managed to work out a way of opening it (since fixed). Anyway, the positive side was that it reminded me that while I was restoring my composure with a stiff drink, it was time to post something on SGL after a long absence.