Room to Growroom, What for walls?

[jsb1904]

I have a growroom in a attic and I have the flowering and vegging rooms blocked off with black plastic. Black painters plastic is cheap, and if you seal all the edges with tape it is completely light proof.
In your case you could use two pieces of plastic and leave a flap in the middle so you could get in or out.

I line the inside of the black plastic and all of the walls with mylar, so i get better light reflection.

You need to make sure that the rooms are completely light sealed, or else you can run into problems.

I have a 17x17 garage dry walled. I just put studs up in the cieling and placed on floor. Then I drilled into wall with stud and spaced along 4 ft and 2ft extra one side. Basically I built an L shape wall and used existing walls, floor and ceiling. I caulked all seams and painted with flat white paint top to bottom. I sprayed floor corners for potential future pests let sit for a couple days then washed floor mildly rinsed well with mop and after dried I tacked in 6 mil plastic 4 times and put molding around floor perimeter. Just put (3) 4 is better 1000 watters and its a great flower room.