Originally posted by MythN7:

Originally posted by _I_:

you can put tar on platforms to prevent weather/rain damage

so i could tar a regular flat floor board and use it as a modern roof?

Technically speaking, yes... although as I understand it, they won't count as roof, nor stop the rain. Perhaps do a "bumpy" roof (26 degree roof upwards, then downwards, then repeat; as Rhapsody suggested), then put darkwood flooring above it?