Why is the pivot point on roof slabs located on the top?

[Bogbadbob658]

Can anybody explain to me why the pivot point on roof slabs located on the top? I can't workout anyway of accurately located the roof slab to the top of the wall. I realise you can offset it but it means you to calculate it for different pitches and thickness'. Am I the only person who thinks it would be more sensible to locate it on the bottom or am I missing something?

[danellis]

It seems to be based on the roof style definition. My firm has some styles where it's on the top of the roof, and some where it's on the bottom. FWIW I agree with you and always use one of the styles with the pivot-point on the bottom.

To control it, I think you need to edit the roof slab style and make sure that the "thickness" is set to a positive value on the components tab.

dJE