Mark3D

Have a look at this file it is working a lot better i added a terrain break set retaining walls to default top and bottom heights and tweeked the terrain data to help 24wc_left_7ft_exp2.plan

When i was looking at your file i noticed you had terrain data on top of terrain data there is a elevation region in front of garage if you keep the elevation region and remove the elevation lines in the same space as your elevation region buy doing a complete break and deleting the over lapping data your terrain will behave much better you should never have multiple elevation data in the same space

that model needs a terrain hole as your terrain is quiet steep and its surface shows up on multiple floors so chief is can not clip correctly

Upload your plan would help you might have intersecting terrain elevation data or you have just not told the terrain to rebuild after you added the data it’s hard to tell with out the plan file

Make sure the roof plane that butts into that wall does not cross it , it should just touch its edge as roof planes stop walls

This is close to auto but auto roof needs to be off on final edit i hope there some smart person on this forum who can get it all the way Desired roof.plan

Export to cad detail then adjust to suit

maybe this file will help you roof skylight.plan

front wall over the garage has no room definition selected

Designing a Cape Cod Roof Bearing on 1st Floor Walls (chiefarchitect.com)

here is a rough example raise porch ceiling first auto build roof and that had to manual tweek a bit to finish it roof.plan

that is good information thanks

Its working but i have no idea what fixed it it may only be tempory have a look 1152103210_existingmodel.zip

can you upload sketchup file then i can try reimporting it

i think that is what you want D plan help.plan

i would turn that fence of in camera layers as it is really slowing things down, it was on my end anyway

that should give you some clues just some manual roof work 1658890952_existingmodel Mark.plan

Check wall structure tab make sure wall top and bottom heights are set to defaults

i had a go at this not sure if it is on the right track also the roof needs some clean up witch is causing it to be messy 693753679_MichaelHackRemodeling.plan

Can you post the plan it sounds like you may have elevation data on top of elevation

Is that right i just copy the correct heights cooper NEWmark.zip

what is ceiling height of 2nd floor ment to be

i give up the defaults seem correct to me

i think maybe you have used the spray can

Post your file you should get some help more focused that way