A Question about Framing a Room Inside a Room +rep for Help

I'm going to framing a 6x8 room inside a room out of wood 2x4 what would be the preferred wood to use on a project like this. I plan to cover everything in in plastic and instead of drywall I'm going to be using 1and 1/2 foam sheets, and sealing all the seams.

Any other tips or afterthoughts people wish they would have know while building there would be appreciated. I welcome all constructive advise.

I just framed a room and ended up using 2x3. they saved me a dollar per 8' board. you dont need to get anything pressure treated!
also to seal the room i used garage door weather strip and stapled it to the bottom of the 2x3 used at the base of wall, could also be done up top. this was helpful becasue i didnt have to seal anything to the floor. the pressure that the studs put on the floorboard sealed the room just fine.

Good Luck!!

you are not building a house, use 2" x 2" to frame the walls, use 3" by 2" to frame the roof/ceiling and remember where you put the timber joists, you will need to be able to find the timber framework when you want to hang heavy equipment so measure and mark where the joist timbers are for later the more you use in the roof/ceiling the better. i have never built a foam room but i have built lots of grow rooms from 2" x 2" sawn rough timber frame covered in 3/4" drywall. i use 2" because the drywall helps strengthen the 2" frame once it is screwed in place, and you can fill the gap with loft/attic insulation for heat and sound, you will have to build a sealed box over the window first and put a flange in for your 8" ducting to draw in fresh air, cut a hole in the inner room wall and draw the fresh air in. all your electrics/timers sockets etc will be between the inner and outer room space, you will make holes in the walls to run the cables through for power, i dont know what you can use as a door as i use a more solid material. if you vent an exhaust fan in to the rest of your house from the open window for the grow room without another window open your house will get warm and go in to severe positive pressure and this gives you a severe headache.
do not know what the fuck this other guy is on about saying pressure treated, after framing and building the room just seal the whole inner room with plastic and build a door.
if you want to see a room and door i did check my 2 posts here :

https://www.rollitup.org/grow-room-design-setup/432700-room-within-room-2.html

Thanks weegogs I already saw your posts and I am going to use some of your ideas to benefit my room. My main concern is smell, I live in an old house that has a bit of air leaks. I want this room to be as close to air tight as possible. I'm going to use my basement to exhaust air and another part of the house for intake.

I've never done much construction and wondering what you recommend for screws with 2x4 and if I should pre-drill them. I am going to go with normal non treated construction lumber as I have almost two dozen 10 footers sitting around when I bought the property.

middle84 said:

Thanks weegogs I already saw your posts and I am going to use some of your ideas to benefit my room. My main concern is smell, I live in an old house that has a bit of air leaks. I want this room to be as close to air tight as possible. I'm going to use my basement to exhaust air and another part of the house for intake.

I've never done much construction and wondering what you recommend for screws with 2x4 and if I should pre-drill them. I am going to go with normal non treated construction lumber as I have almost two dozen 10 footers sitting around when I bought the property.

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use drywall screws, length depends on the thickness of the board, i usually go with 1.5 inch or 2 inch, use a powerdriver, needs to be a good one to last. drywall screws do not need predrilled holes, the screws for the timber construction can be 3 inch any larger than four inch really needs to be nailed. i used a thick plastic for the floor and a used a cheap white plastic for the walls, my room is totally soundproof and air tight, i live in a towerblock 23 floors high, so smells and noise are a no no.
when you vent in to your basement you will need a window open, there will be warm humid air filling the basement area like a balloon and the room air pressure will rise.

lets get it right do you have central air?

is this room upstairs or down?

in this case pressure is measured inside the tent not in your house and as for the warm air...youll save in ur heat bill...or vent it through the ceiling(summer)!


since your in a room i take it you can secure that door via handle lock, now you use that as ur securty point. once you walk thorugh the door you frame out what ever you want for a room using what you think will suport 65 - 300 pounds give or take depending on size of room! now you wrap that room in plastic and use a zipper door to enter that room.you can seal the plastic with glues tapes etc...dont go cheap here you dont want a connection point breaking mid season when your lovely lladys stink. as for a measure of pressure you will see your walls contract and you will want to cut a hole into the plastic to adjust the intake opening. once you see theres a still a weak slight pull on the plastic wall it is now a negative pressure area and you can put a pvc pipe with air filter in that hole to ensure no bugs but fresh clean air is comming in.now as for temp control you must have the room kept at proper temp mid 60s to mid 70's and a vent sucking air out thru a scrubber into the hole in ceiling out thru building while only raising temp in room by 10 degrees!i kno this is cheap but hey its effective......sorry for shitty typing im stined and way over tired!any questions and im sure its not dtailed or even gunna be agreed on by every one but its my 2 cents good luck!

2x2 lumber will work. If it were my project I would go with 2x4 studs. Don't use regular 2x4's those are bent and twisty. The lumber for studs is better quality and costs more. The frame is something you cant change later. 2x4's will give a really solid set up. That's just my preference. I tend to over build stuff.

The biggie is ventilation and temp control. You didn't say what size lamp you are using.