Our house has been re-roofed at some point and now has 2 roofs as the new roof was laid over the old one so I suppose you could say we've got a 'double'glazed' roof.
If you're worried about buying a property that might need re-roofing in the foreseeable future, I guess the best thing to do is to buy a newer house and hope for the best. As well as re-roofing there's an option to
refurbish which would probably be a cheaper option if the state of your roof allowed it.
It could be a large expense, but putting a price on it, as Taffy says, would be very difficult with all the different finishes available and the variety of roofs types and sizes. Some places would have straight forward long-run roofs whereas others could have all sorts of twists and turns in them which require more fiddling about with. I have to say, I haven't heard of anyone who's had to re-roof although no doubt they are about. It's encouraging though that it doesn't appear to be a common activity. I think general warranties for new roofs run at 10-15 years so we could all be forced to at least check our roofs periodically or, alternatively, move to a newer house.
Got me worried now.
