LeadFarmer, more idea
Have a look at the metal tiles effect roofing sheets which is acceptable on 10 or 12 degrees pitch,
I have this below on my summerhouse with the 10 degrees pitch,
http://www.slecladding.co.uk/versasteel.htm
or 12 degrees pitch with insulation below
http://www.slecladding.co.uk/kingspantiles.htm
They comes in 1 metre wide and I think it was 6 metre in lenght but I think they do do it longer but if you give them the correct lenght they will pre-cut it for you. You can hear the heavy rain on them but if you still got flat roof underneath should help or maybe put in thicker insulation in
but need to know the angle of your roof pitch first
Have a look at the metal tiles effect roofing sheets which is acceptable on 10 or 12 degrees pitch,
I have this below on my summerhouse with the 10 degrees pitch,
http://www.slecladding.co.uk/versasteel.htm
or 12 degrees pitch with insulation below
http://www.slecladding.co.uk/kingspantiles.htm
They comes in 1 metre wide and I think it was 6 metre in lenght but I think they do do it longer but if you give them the correct lenght they will pre-cut it for you. You can hear the heavy rain on them but if you still got flat roof underneath should help or maybe put in thicker insulation in
but need to know the angle of your roof pitch first