Been playing a bit and just reached novac. Everything is floating and i don't want to play until i fix it.

Here's my load order:

0 0 FalloutNV.esm
1 1 DeadMoney.esm
2 2 HonestHearts.esm
3 3 OldWorldBlues.esm
4 4 LonesomeRoad.esm
5 5 GunRunnersArsenal.esm
6 6 ClassicPack.esm
7 7 MercenaryPack.esm
8 8 TribalPack.esm
9 9 CaravanPack.esm
10 a YUP - Base Game + All DLC.esm
11 b Active Wasteland.esm
12 c Better New Vegas.esm
13 d Interior Lighting Overhaul - Core.esm
14 e BookDiversityProject.esm
15 f FreesideOpen.esm
16 10 ELECTRO-CITY - CompletedWorkorders.esm
17 11 ELECTRO-CITY - Highways and Byways.esm
18 12 NVStripOpen.esm
19 13 FCOMaster.esm
20 14 YUP - NPC Fixes (Base Game + All DLC).esp
21 15 Improved Sound FX.esp
22 16 EVE FNV - ALL DLC.esp
23 17 FalloutNV_lang.esp
24 18 dD - Enhanced Blood Main NV.esp
25 19 Better Burned Man.esp
26 1a Active Wasteland - Vanilla Replacements.esp
27 1b Active Wasteland - Goggle Tints.esp
28 1c FCO - NPC Changes.esp
29 1d outsidebets.esp
30 1e FreesideOpenPatch.esp
31 1f Uncut Wasteland FSO OB.esp
32 20 populatedcasino.esp
33 21 JSawyer Ultimate.esp
34 22 TheSinkRemodel.esp
35 23 vault22FloralOverhaul.esp
36 24 Active Wasteland - Dead Money Replacements.esp
37 25 Active Wasteland - Dead Money Goggle Tints.esp
38 26 Active Wasteland - Dead Money Coffee Maker.esp
39 27 Active Wasteland - Coffee Maker.esp
40 28 CasinoBankMoney.esp
41 29 CasinoHeistPack.esp
42 2a Armored Duster.esp
43 2b Dark Justice Duster.esp
44 2c Bullet Impact Increased LOD.esp
45 2d Burning CampFire.esp
46 2e ZK13 - Return of the Eyebots.esp
47 2f Delay DLC - DM + HH + OWB + LR + GRA.esp
48 30 GRA - The Right to Bear Arms.esp
49 31 Expanded Ranger Combat Armors.esp
50 32 Gunslinger.esp
51 33 DragsModernGunslinger.esp
52 34 CAGE 1.9.3.2.esp
53 35 Cloth Impacts - Decal and Effects.esp
54 36 dressup.esp
55 37 XFO - 9a - Enemies - AI revamp.esp
56 38 XFO - 9da - Enemies - NPC Healing - low.esp
57 39 XFO - 9db - Enemies - NPC Healing - med.esp
58 3a XFO - 9dc - Enemies - NPC Healing - high.esp
59 3b EnhancedGrass.esp
60 3c Light Step ED-E.esp
61 3d Sunset Sarsaparilla Star Caps Random Luck.esp
62 3e Max Level 100.esp
63 3f Modified Combat Values v2.esp
64 40 MiscItemIconsNV.esp
65 41 Extra Rounds.esp
66 42 Bullet Fixes.esp
67 43 No Hitscan.esp
68 44 Improved Ballistics Effects V2.esp
69 45 GRA WRP Compatibility Patch.esp
70 46 No Tracer.esp
71 47 UMI - Useful Misc Items.esp
72 48 UnderwaterFX.esp
73 49 BLEEDNV - Final.esp
74 4a realistic headshots.esp
75 4b FCO - GlowingOne.esp
76 4c FCO - OHSB NPC Edits.esp
77 4d cpoJGArmorReplacerPlain.esp
78 4e cpoJGArmorReplacerDecorated.esp
79 4f Red Bandana.esp
80 50 arcadeGearCoat.esp
81 51 T6M Gambler Female Suit.esp
82 52 NCR Rearmament v1.5 (Lore).esp
83 53 FCO - Race Addon.esp
84 54 ExtendedNVRadio.esp
85 55 Faster Start Menu.esp
86 56 Improved Sound FX - Weapon Sharing Fix.esp
87 57 Interior Lighting Overhaul - Ultimate Edition.esp

I used to have a novac appartment mod but i uninstalled it as it was my only mod affecting novac so i thought it would fix it.

Please help!

This is an old post, but I know which mod causes this and couldn't find any mention of it anywhere.
The offending mod is "ELECTRO-CITY - CompletedWorkorders.esm"

If you disable that you'll find that Novac is no longer a portal into the void dimension. I'm currently looking into a proper fix that won't require you to disable the mod. Going to browse the nexus for a bit and see if a fix is available. Failing that I'll try to undo the deletions this mod made through the construction set myself.

Edit: I should add that the "ELECTRO-CITY - Highways and Byways.esm" is also guilty of this type of screw up. Doing the Camp McCarran quest "Three-Card Bounty" I found that the inner area of the ruined building Driver Nephi occupies had its ground similarly sunken in. As a result all the Fiends inside the building, including Nephi, had been trapped in said pit. This made it impossible to lure him outside towards the kill zone the 1st recon squad set up, thus forfeiting the bonus earned from having them help kill him. It was an easy fix, though, as disabling the offending mod didn't hurt me at all.