Hello RIU, i would like to build an underground growroom. I plan on digging a huge whole in the ground. Pouring a concrete slab. Then use cement blocks for walls. I will then insert rebar in the walls, then fill will cement. I am looking for suggestions on how to construct the ceiling as well as the door. This will be completely underground, so i need it water tight. Depending on how big i make the room will determine what size tent(s) i will be using. I plan on going all out with 4-6 1000w hps' w/cooltubes, carbon filters, co2, and ebb n flow system. I plan on using a silent diesel 6000w generator to power everything. I would greatly appreciate ANY comments and ideas. Seriously if you think you have a good idea to supplement my plans, please let me know. I want to go all out but, i want to be stealth about it. Criticism is welcome! Thanks and happy growing!

Are you looking a putting something small in the ground, like you would open the top and work on it or a ROOM that has stairs and a lot of dirt on top so there is no sign form the air? The room idea is a dream of mine, notice I said dream...Here are some links for the latter.......JR

Get out the wallet
http://www.hardenedstructures.com/underground.asp

This one is way more survival but you can't tell your neighbors your building a room to grow weed in can you
http://www.alpinesurvival.com/nuclea..._shelters.html

Or move to Tennessee and live here (Don't jump on me I know it sold already)
http://www.youtube.com/watch?v=Hg2TyjWjCls

Nice man. I wanted to do an underground room but the costs were just to high, and the logistics were terrible (Mountain side bk in the woods 1/4 mile...hard to get a CAT in there, yknow?)
It sounds like you are going to be building a fairly large room, and when it comes to a ceiling the strength you need depends on the depth which you didn't specifiy.... http://waltonfeed.com/old/old/cellar2.html <--That is the plan I wouldve used...I would recommend doing some inner walls out of blocks to support your ceiling.

Best of luck. If you aren't worried about stealth, I would consider just making the ceiling ground level and installing a greenhouse roof. Underground ftw!!! Much more stable temperatures.

Completely underground so it is invisible. I'd like to have a door in one of the walls. I plan on covering the ceiling with at least several inches of dirt, then lay grass. What i'm thinking is the best way would be build it into a hill, at like a 45 degree angle, so maybe only one partial wall with door is exposed. I can always camoflauge it somehow. I have over ten acres so i'm not that worried about someone seeing me construct this room. What do ya know, i might be in Tenn but as far as i know i don't live on top of a f ing huge cave like that.

I appreciate the information guys. I plan on doing this by myself so i have peace of mind. It might be expensive but it is gonna be well worth it.

Get a used sea-land cargo container. Standard size is like 10 feet wide by7 feet high, by 40 or 45 feet long. All steel, wooden floor, dirt tight. Cost about $2000.00 to $3000.00, they will deliver them. Rent a good sized track hoe. (they will deliver that too) about $400.00 a day. Dig big hole. Lower container into hole. (with chains and track hoe) Cover with dirt. spread left over dirt around, call to have track hoe picked up, light a fat one.
Of course there would be some prep work before covering with dirt. What with an access hatch and vents and elect. wires and water lines and propane lines and such. Put most of the grow op stuff in before you bury it, easier than bringing it down the hatch later. You could even set most of it up inside while it's sitting on top of the ground. (just a suggestion)
This is my dream, this will happen, someday.

Thats going to be hard...Digging the hole that is.. Are you going to rent a CAT or something?....Just the logistics of digging a basement are complicated.

With a back hoe and time you could do a lot, you would need steel beam for the roof. If you where patient you could find them second hand. Not to bring up ta-bu, because we are all law abiding citizens and this is all fiction, with no codes to follow and no one to answer to is the way to go, Just follow some sort of plan, and be safe......JR

By the way...you own land in Tennessee? I really want to buy like 4-5 acres to live on somewhere...any tips for someone hoping to buy some acreage?

u get charged taxes for owning land