Tim Lamb wrote:
Chris Bacon writes
Tim Lamb wrote:
I am replacing a time expired corrugated steel roof and am
considering using composite roof panels which are much heavier

Why not just replace the "corrugated iron" sheets? Last for ages,
cheap, easy to put up.

Unfortunately moist air condenses on the underside of cold steel sheet.
This is particularly apparent when such buildings house cattle on deep
litter and there is a frost.

Lay the iron over 1/2" Sterling board. This works well. Then again,
you're adding weight...