I have just bought a terraced house with a flat felted roof. Although it does not appear to be leaking I asked a roofer to have a look at it. He said it is not in good condition lots of puddling signs of water under the top layer and had been patched up quite a few times. But he also said could get up to 5 years out of it before it needs replacing.
Anyone any idea how much it would cost to replace it and what should it be replaced with?