how do you build a glass roof

[SamsTheMan]

I've been trying to build a green house but I can only seem to make glass pane into a window

[FreedomTrucker]

You'll have to use the forge to make business or bulletproof (much stronger) glass blocks, ramps, plates, or curves. Should be able to use advanced rotation to build various roof geometries. Feed the forge with glass, lead, and clay for business glass blocks, add stone and iron to that for bulletproof. That's in the vanilla game. Undead Legacy mod has some interesting new ways to make bulletproof glass using wire mesh and such. I think I got that right. I'm about to fall asleep. LOL. Good night.

[𝔇ave]

note that bulletproof glass does not allow the growth of plants under it. but the rest of the above info will serve u well