How to create an Octagonal Roof in The Sims 4 - Sims Online
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The Sims 4 Building Roofs
Snow inside my Sims house because of the way I build it? - Answer HQ
Glass Roof The Sims 3 Tutorial
Tutorial: Using Glass Roofs in The Sims 4 | SimsVIP
I took the advice to use platforms as my flat roof : r/Sims4
Apparently the metal/gravel/concrete roofs can be used on a flat roof. I guess the fact that one of the roof types is made out of small loose stones should've made that obvious...but