I've seen the sloped roof on the "Winter Village Post Office" and similar using plates, and I want to build a roof with a similar angle:
What should I use to ensure they are well attached?
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See the instruction for that set on pages 56-59, 65 and 68/69 for the 3 different roofs of it.
they're using a different technique and different pieces for all of them, so this perfectly shows up some alternatives (technic-like parts for the big roof to the right, blocks with studs on the sides for the small 90°-roofs and 1x1 with clips for the roof to the left).