In article ,
"Mary Fisher" writes:

"Joe Fischer" wrote in message
...

snip

roofs don't usually last more than 15 or 20 years,

WHAT?

Our house was built in 1937 and has its original roof (plus solar water
heating panel). Most of the others houses on this estate are the same, the
few who have newer roofs have replaced them for reasons other than failure.

He's posting from the US.
In the UK, roof life between significant maintenance events has
normally been around 70 years (so you've got 1 year to go Mary;-).

It is likely that with better materials used in recent years,
roofs which are less than 70 years old will extend this period,
but we don't have figures for them yet, obviously.

--
Andrew Gabriel