An easy way to create roof parts is the Generate 3D shape plugin. With that plugin you can create shapes by defining 8 coordinates. Eight points is enough to create most of your roofs. The generated 3D shapes will usually texture correct.
I created the pyramids in my DodecagonShapes library with Blender but with the Generate 3D shape plugin you can create the same pyramid that will also texture perfectly.
The displayed roof has the same texture as GaudiGalopin3324 used but with the transparent part removed. In this example the result from the generated 3D shape textures perfectly when scaled to 300%. You can define each side separately which makes it easy to give the top a different texture and make the bottom invisible.
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