Building 3 20'x12'x10' Sealed Rooms. Suggestions?

[Backwoodboys]

What's up fellas? Long time lurker here. I've been growing for the better part of 12 years, and now I'm finally making the switch to completely sealed rooms. I will be building three 20'x12'x10' rooms that will each hold 11 1k lights. Lights will not be cooled. I have factored in for 5 tons of mini split AC to keep the heat in check.

What I really want are suggestions on the build. I will be using 2x4 for the studs and I will be using spray foam insulation on all walls. 5/8" plywood on the exterior and 5/8" green drywall for the interior. I'm pretty sure the spray foam insulation will 100% seal the room up, but what other suggestions do you guys have?

How about the door? I will be using an exterior door for its sealing properties, but should I be taking extra measures to makes sure the door is 100% sealed?

Any and all construction criticism is encouraged! Thanks in advance!

 

[1diesel1]

Hay that's a good set up. Be careful with the mini splits there not as eficent as the package units. Are you in a set up with single phase or three phase? Is this a shed or a room your building inside?

 

[Backwoodboys]

I'm on 3 phase 208v. These are rooms built inside of a warehouse

 

[1diesel1]

What we have done with the walls 5/8 Sheetrock inside then insulated r30 outside no plywood then kaulked the seams between the sheet rock where it's exposed.
Then we used a roofing product called TPO. We fully adhered it to the floor and walls. TPOs uv reflection is amazing. I also used exterior doors and haven't had any issue with my o2. I would imagine your up and running are the 5 ton minis efficient enough for cooling?

 

[Cali clouds]

One nice thing about multiple mini splits over a big package unit is if one goes down you don't lose the whole room. Install time is alot faster. If you go with some good quality units you can get incredibly efficient units. Fujitsu is the shit. If you buy hydro store mini splits you can just plan on replacing them pretty quick and they are not efficient at all. 13 seer units. Pretty shitty. and 1/2 ton/ light is kinda our standard for open hoods. I factor in a lil more with the d/e's @ 1200w ,especially if you plan on using co2 generators. co2 geni's have a BTU rating. 12000 btu is 1ton. I'm in so cal so it is hot here

 

[1diesel1]

Ive installed package units ducted in then for back up installed split system. I just figured if my main failed which it will it's cheaper and easier to roll a new 5 ton unit to the same spot. I agree with you never go cheap brand I prefer Carrier or York commercial units. Mitsubishi splits are the shit though. What you using for flower lights a buddy turned me on to gevitas unbelievable difference it's amazing. I'm one state north.

 

[noone88]

high temp shut offs. There are stand-alone units or ones built into a timer. No need for redundant ACs.

Wash basins in each room. Or floor drains.

12' or higher ceilings. 10' is barely the cutoff for gavitas.

I prefer the package systems. Point the air registers at the canopy and you won't need that many fans. Plus it really makes the plants go purple (need the genetics obviously)

About to buy and buildout another warehouse, so we'll be making revisions and improvements.

 

[Cali clouds]

To me 2 a/c's on a room is standard. Even with high temp shut off your room will just turn off. If you have 2 a/c's the light will just dim and keep running if a a/c crashes. Even if you use package units or standard split systems, 2 units on 1 room is the shit. Look at a cell phone tower they all have a back up unit on the building so the place doesn't shut down

 

[noone88]

I misspoke. We are using redundant AC's in our rooms. In fact, in our 16 lighter, we had 1 of 2 3-ton minis stop working during mid bloom. It took us 2 weeks to get it repaired due to the busy summer season. I was able keep the room going by only powering half the lights and then alternating every day.

Per advice from our contractor that builds server rooms, he recommended that we put the air return as high as possible and duct the cold air from the ground. We are giving it a try in our new rooms.

 

[Herb Forester]

I misspoke. We are using redundant AC's in our rooms. In fact, in our 16 lighter, we had 1 of 2 3-ton minis stop working during mid bloom. It took us 2 weeks to get it repaired due to the busy summer season. I was able keep the room going by only powering half the lights and then alternating every day.

Per advice from our contractor that builds server rooms, he recommended that we put the air return as high as possible and duct the cold air from the ground. We are giving it a try in our new rooms.

How will you distribute the ducts, sub-floor or wall? Sounds like good use of convention current.

 

[noone88]

No

How will you distribute the ducts, sub-floor or wall? Sounds like good use of convention current.

No idea. We are using rolling tables/benches too. We will be running flex ducting around the room until we have it figured out.

 

[Cali clouds]

Spiral is sturdy. if you are running ducting to the ground I wound worry about flex getting damaged

 

[noone88]

Thanks, yea it will be a temporary setup until we know where we want to put all the cold air ducts. 10 tons of AC for 21 1000DE gavitas and summer is almost over so we should be okay with cooling.

We are also going with 14' ceilings so the total volume of air that needs to be cooled is different. In the past, we have stuck with 10' ceilings.