Unfortunately we see this sort of thing all the time.
I’m sure these plumbers/gas engineers have done a great job fitting a new boiler or bathroom suite but the same care and attention has not been given to weathering the flu’s.
Flu’s often need to be passed through a roof and crude repairs are common as they can rarely be seen and often last long enough to allow the client to safely assume all is well.
If you are fitting these flu’s regularly and would like to discuss how to pass this responsibility on to roofing experts – We are working alongside many plumbing and heating engineers already very successfully.