Is it possible to have the flue of a combi boiler going through a flat roof? I am considering having one fitted, but wanted to know whether it could be reliably done without a leak. Some installers advise against it becuase they say it is tricky and prone to leaking, damaging the boiler in the process. Is this the general opinion, or will there be installers who don't mind going through flat roofs? What are the problems, if any?
thanks.
thanks.