I wish I'd had this written down rather than figuring it out myself, so maybe I'll help someone else...

Here are the roof slope angles you can use to get livable space underneath AND be Seasons compatible. As you know, if you don't want your Sims upstairs to freeze to death, you have to build the roof, delete the wall in the livable part, replace the wall, and build the roof again one floor up .
If you do this and don't get the angle exactly right, you'll get a sloppily mismatched roof like this:




So rather than do that, or figure out the correct slopes by trial and error, here are some proven workable roof slopes:


4/12 rise
type "roofslopeangle 18.43" sans quotes
This is the shallowest pitch that works - but you will not get livable space under the roof until it's gone over 9 tiles.





4.5/12 rise
type "roofslopeangle 20.56" sans quotes
Livable space after you've gone over 8 tiles
(Image coming.)




5.143/12 rise
type "roofslopeangle 23.2" sans quotes
Livable space after you've gone over 7 tiles
(Image coming.)




6/12 rise
type "roofslopeangle 26.57" sans quotes
Livable space after you've gone over 6 tiles





7.2/12 rise
type "roofslopeangle 30.96" sans quotes
Livable space after you've gone over 5 tiles
(No pic of this one. Maybe later.)





9/12 rise
type "roofslopeangle 36.87" sans quotes
Livable space after you've gone over 4 tiles





12/12 rise (the default in SIMS 2)
type "roofslopeangle 45" sans quotes
Livable space after you've gone over 3 tiles





18/12 rise
type "roofslopeangle 56.31" sans quotes
Livable space after you've gone over 2 tiles





24/12 rise
type "roofslopeangle 71.5" sans quotes
Livable space after you've gone over 1 tiles
PIC

Ahh a good tip indeed. I havent installed my copy of Seasons yet, but will propably do that today or tomorrow, will be interesting to see how many of my old buildings that has to be remade/rebuilt. Thanks for sharing!

Thanks... this'll save some test-out times.

Linkage for roof and attic things:

attics in seasons [abel1980]
http://www.modthesims2.com/showthread.php?t=223637

Bigger attics
http://www.modthesims2.com/member/s...ad.php?t=156028

RESOURCE: Helpful roof slope angles
http://www.modthesims2.com/showthread.php?t=228157

Info box indicating weather state @ build mode
http://www.modthesims2.com/showpost...957&postcount=6

seasons and roofing
http://www.modthesims2.com/showthread.php?t=233485

Thanks, this is helpful! <plug>Will probably mix very well with the Bigger Attics approach (link in Niol's post) to maximise the livable space</plug> =)

Oh, that looks interesting! I will try it when I get back home. Does it combine OK with basements?

This is great! Thanks so much! I always did 56.3 for my rowhouses. (Learned it from a TSR tutorial-Cyclonesue) I can now build Parisian Lots w/o CFE! & W/Pets, individualroofslopeAngle will also help me! Thanks so much! (could be a sticky..but idk)

Yes, it does. All you need to know is how to make the uppermost level (roof support) 4 or 6 clicks high -- i.e., account for the extra height of the basement --, the rest is easy-peasy =). Post in the Bigger Attics thread if you get stuck, I have it subscribed!

Have fun!