Hay stearmyTea Would say over 40 years from what I gather from neighbour and dose not look the best I not gone with the guy that will fiberglass just sounds like it hiding the problem after looking at this lead ax it looks a better one for cost and me and he doing it properly and removing the slate then laying it and so on
Any one know about lead ax any info would be helpful I like to know what's going on is any good ?