I was talking to a neighbor today who lives next door to a project we're working on. We was telling me that a few months ago Indian doorstep sellers climbed up on his roof and tried to put their wares through his roof tiles. I have never given much thought to this method of selling, or how to persuade them not to try it, until now
Motion sensor lights may be good to spook them if they come in the night, and I suppose you could weld security bars or even chain link fence to your frame in the attic, other than that and razor barb wire, I'm drawing a blank.
Other ideas?
cheers JackM