Mark3D

See if that video gives you what you need

Does that get you what you need, check attached file I just finished it with manual roof. Working.plan

This video show what happens with overlapping height data

Also turn on attick walls there is one that messing with that intersection I found the problem went away when I deleted the attick walls if this is a suitable thing to do

To start with the file uploaded has no foundation so maybe its the wrong file, Jims screen shot show what to adjust.

Its seems to work fine for me, you are not changing the defaults instead of the individual garage rooms, or are you selecting the spanner after setting the negative height.

Try watching some videos there are heaps on you tube also chief website have more just not sure you can access them if you are using x15 may be SSA is not current. there is a note in the plan file attached plan file 264014205_3roofandporch.plan

Had a go its not perfect but maybe good enought with some manual editing 264014205_3roofandporch.plan

Steps to rotate

Watch this video https://www.chiefarchitect.com/videos/watch/10119/using-the-adjust-material-definition-tool.html

It is x17 only but x16 this should work

3D Menu-Adjust Materials-Interactive material Editor in standard camera view

it should look like =count*0.15 you are missing the zero before .15

Is this what you want blue house with porch roof help.plan

Share your plan file

I can have a look for you if you like I will send you a private message

Sorry i did not read your first properly, I do not how to help with over framing its adding complexity that I have little knowledge off

See if that model is cleaner and closer to what you want. you need to not place roof plains on top of each other with out cutting and joining to each other if it is what you want i can do a video show how I did it, also I change the rafter sizes to 6"not what size you want but 9" seemed to big to me not sure thought and causing some gaps Roof Frame help.plan

Also you can unlock roof trim layer and adjust how you want it

Now that you are having a go at it, see if you can share or upload your plan file you should get quicker more accurate answers

If i understand correctly, change setting shown in screen shot then rebuild foundation if i am wrong show me what you need in screen shot

Its all good don't worry but it still has a problem it must have been open in chief as the plan file has zero bytes size or maybe you attached the same file

I think you had the file open in chief when you zipped it, as the file has 1 Kb make sure you don't have it open in chief when compressing it, also it may end up being bigger than 14mb after zipping it so you may have to put it on google drive dropbox or other

I think you may have forgot to attach zip file

You need to share your .plan file not .layout