I have flat ground, first floor is blue, second floor green, third floor yellow, roof now is orange/red. I lowered the roof a bit and change angle. Old way was 2 roof at 45 with 1 roof 26 then top. I now have 1 roof at 45 with 2 roof at 26 plus top. Changed a third floor by adding more beams in all directions which I have no issues so far. Strange that 45 degree gave issues while 26 degree held up. Wondering if height was the issue.