Tips for multi story building? No mods

[Salem Graves]

Edit: Well after fumbling around in the menus more, I found these floors that are like twice as thick, I assume those are meant to be used for the upper floor because they fill the gap nicely.

I'm not using any settlment mods (i know, crazy) except for the "place everywhere" mod, though I've found it a nightmare to use in an attempt to build a building, so I just have it disabled. After like 2 in game days of fiddling with walls, floors, stairs and roofs, I've managed to find a way to construct a multi story building, only there's a gap between the wall and the second story floor.. So I'm looking for any tips from you guys on how to build a multi story building without it looking like bung assuming this is possible.
http://steamcommunity.com/sharedfiles/filedetails/?id=1322900650

[MortVent]

There are upper floor pieces in the floor menus. They are 2x as thick. Since there should be a roof then a floor on the flat roof

In addition the warehouse items do make it easier to do multi-story buildings (though with less options in wall variation) from the DLC

[#GLOCK-23]

check out this building i made in far harbor on the beach

http://steamcommunity.com/sharedfiles/filedetails/?id=1308920829

[Wayz]

If using Horizon there is a premade 6 story apartment building that is semi furnished and counts as only one item in settlement costs complete with limited lighting, a bar and roof top gardens.
If not using horizon the modder is releasing the "Architect" side of horizon as a standalone mod if patient.
https://steamuserimages-a.akamaihd.net/ugc/930429331966287788/48597A28876E748B05E41190A107AAEDF6F07A7C/

EDIT: Sorry just saw the no mods in title, my bad, ignore this and play ya vanilla.

[Simpson3k]

If i may... i suggest to be carefull with multi story buildings for settlements because, the settler AI hates it...they do a break at mid stairs, blocking the pathes of followers, walking back and forth between their bed, they assigned work and the relaxion area.. You literally require multiple stairs between every single level of your building.

And beware if you share that building with your settlers and try to reach your armor crafting station... but mama murphy stands on the stairs and telling you... no mor chems, nor more third and and no passing by her to the next level...

[Wayz]

Originally posted by Simpson3k:

If i may... i suggest to be carefull with multi story buildings for settlements because, the settler AI hates it...they do a break at mid stairs, blocking the pathes of followers, walking back and forth between their bed, they assigned work and the relaxion area.. You literally require multiple stairs between every single level of your building.

And beware if you share that building with your settlers and try to reach your armor crafting station... but mama murphy stands on the stairs and telling you... no mor chems, nor more third and and no passing by her to the next level...

Another reason I like architect as pathfinding was added to these buildings.
Not using mods at all I found I had the most luck with pathfinding in general using the vault 88 dlc tilesets but my settlements started to look more like mars colony prefabs rather than wasteland settlements.
https://steamuserimages-a.akamaihd.net/ugc/920290943567470795/DC27A67C714B3C372AF69BC1788EAC641C3BE374/
https://steamuserimages-a.akamaihd.net/ugc/920290943567469054/8A31928E43D87A2E0ECBDC5233448516C472D583/