Active job

Re-coating decramastic roof

I would like to recoat the roof. It's a decramastic roof and it is put on since 1977 and it's got asbestos. The pitch is 20 degree and the floor area is 145 sqm. Last year I have done some maintenance work including chemical spray to remove moss and lichen, and painting on the rust points with bitumen membrane. Would you be able to give me a quote for the re-coating? and I'm wondering how long is the guarantee. Thank you very much. Jack