New groom room (with sketch)

Kalvalax

New Member
Hey rollers!

Long time lurker, new grow and a new account! :)

So I'm planning to redo my entire grow area, I've done 2 successfull grows in this area but with a very low effort setup which in turn made it pretty difficult to work in it. I'm going to change things up to make it more streamlined and alot easier to work with. I would love for any feedback that you may have!

First let me explain the picture I've attached. The hollow square on the right is the entrance to an attic space. The posts are the trusses (there are more, I've just drawn up the important ones), the red arrows are where I have intended to have the warm air exit and the blue arrows are where I have intended to have cool air coming in. The top side exits will only be used if necessary.

The dimension of the entire grow area (within the posts) is 9,4 meter length, 2,2 meter wide and the height up to the ridge is 2,35 meter. Slanted roof though so the entire height can't be used.

My plan is like this;

Flower room - 3x 1x1m hydro trays running E&F, SOG style growing due to the limited height available. (May only be 2 trays depending on how it looks when I actually start to assemble stuff)
Veg room - 6x flower plants, 3 different strains. (May only be 4 mother plants depending on how it looks). Not sure which route to go with the mother plants yet, looking at DWC. Ideas?

Ventilation - The direction of ventilation will be from left to right. 2x filters from flower room, 1x filter from veg and probably 2x filters on the warm air exit holes on the right. There will be an AC unit directly below the "entry square", kind of making the lower floor a lung room. I will mainly rely on passive intakes on the holes with the blue arrows, thinking that I'll need one active in the flower room though. One of the intakes in the veg room will probably have a T-connector so that both the flower and the veg room will have access to passive intakes from that one.

The ventilation part is the one that I'm the most insecure about. I have no idea how to actually do any real calculations on how much airflow I need to keep negative pressure and exchange the air in there sufficiently. The holes in the floor will have a diameter of 125mm. It's worth mentioning that the grow area isn't sealed so if the holes aren't allowing the exact amount of air intake there will still be air coming in from other places, ideally as much as possible goes by the AC unit though. Any and all feedback is most appreciated here!

Smell is important to keep really low so I will be running 2 filters from the flower room and 1 from veg. If needed I can add another filter in each room that scrubs the air but doesn't exhaust it anywhere.

Thanks in advance for any help you guys can provide!
 

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Hey rollers!

Long time lurker, new grow and a new account! :)

So I'm planning to redo my entire grow area, I've done 2 successfull grows in this area but with a very low effort setup which in turn made it pretty difficult to work in it. I'm going to change things up to make it more streamlined and alot easier to work with. I would love for any feedback that you may have!

First let me explain the picture I've attached. The hollow square on the right is the entrance to an attic space. The posts are the trusses (there are more, I've just drawn up the important ones), the red arrows are where I have intended to have the warm air exit and the blue arrows are where I have intended to have cool air coming in. The top side exits will only be used if necessary.

The dimension of the entire grow area (within the posts) is 9,4 meter length, 2,2 meter wide and the height up to the ridge is 2,35 meter. Slanted roof though so the entire height can't be used.

My plan is like this;

Flower room - 3x 1x1m hydro trays running E&F, SOG style growing due to the limited height available. (May only be 2 trays depending on how it looks when I actually start to assemble stuff)
Veg room - 6x flower plants, 3 different strains. (May only be 4 mother plants depending on how it looks). Not sure which route to go with the mother plants yet, looking at DWC. Ideas?

Ventilation - The direction of ventilation will be from left to right. 2x filters from flower room, 1x filter from veg and probably 2x filters on the warm air exit holes on the right. There will be an AC unit directly below the "entry square", kind of making the lower floor a lung room. I will mainly rely on passive intakes on the holes with the blue arrows, thinking that I'll need one active in the flower room though. One of the intakes in the veg room will probably have a T-connector so that both the flower and the veg room will have access to passive intakes from that one.

The ventilation part is the one that I'm the most insecure about. I have no idea how to actually do any real calculations on how much airflow I need to keep negative pressure and exchange the air in there sufficiently. The holes in the floor will have a diameter of 125mm. It's worth mentioning that the grow area isn't sealed so if the holes aren't allowing the exact amount of air intake there will still be air coming in from other places, ideally as much as possible goes by the AC unit though. Any and all feedback is most appreciated here!

Smell is important to keep really low so I will be running 2 filters from the flower room and 1 from veg. If needed I can add another filter in each room that scrubs the air but doesn't exhaust it anywhere.

Thanks in advance for any help you guys can provide!


Where are you located? If you're anywhere it gets hot in the summer this is a BAD idea!

I tried something like that in 1995! NO kidding! It didn't work out!!!
 
I’m not sure but if I follow you
You hope to use passive a/c from existing home for your grow area
That will not work
You have to much heat load with attic and lights ….
I hope I misunderstood tbh
 
Where are you located? If you're anywhere it gets hot in the summer this is a BAD idea!

I tried something like that in 1995! NO kidding! It didn't work out!!!

We have a few warm months per year, most months are cool but not cold, every once in a while we get a really cold winter. I do plan to add some form of insulation to the roof, the floor is already well insulated. Not exactly sure what kind of insulation I'm going to use though as space is limited so I can't really do a thick layer of insulation.

I’m not sure but if I follow you
You hope to use passive a/c from existing home for your grow area
That will not work
You have to much heat load with attic and lights ….
I hope I misunderstood tbh

No no, I'm sorry for being unclear. The AC (minisplitter is perhaps the correct term?) will be for this purpose only. Without saying too much, the floor below isn't for any type of living. More like storage area. So the idea is that during the warmer months I have the hot air being pulled down to the lower floor and passes by the minisplitter, and at the other end of the facility fresh cool air goes up to the grow area. During the colder months I'll use the same warm air going down passed the minisplitter.

My thinking is that this way the small hobby area on the lower floor will be some what heated all year around which would be good for other purposes.

Sorry for the misunderstanding, I'm no good with the correct terminology yet. I appreciate everyones feedback, thanks!
 
Another serious note . . . water runs downhill.

If you EVER have a leak you will soak/ruin EVERYTHING below that grow room. For the expense of converting this attic space, why not just build a 12x12 'shed' outside and go that route?

I've been doing this since '95. I PROMISE YOU WILL EVENTUALLY GET A LEAK !!!!!
 
Another serious note . . . water runs downhill.

If you EVER have a leak you will soak/ruin EVERYTHING below that grow room. For the expense of converting this attic space, why not just build a 12x12 'shed' outside and go that route?

I've been doing this since '95. I PROMISE YOU WILL EVENTUALLY GET A LEAK !!!!!

Oh I would love to build a shed for it all! I'm in the wrong country for that though, if you know what I mean. I have quite a bit of experience with plumbing so I definitley hear you, at some point shit will break and make my life miserable. I'm going to be looking for "overflow trays"/collection trays that will be placed under the water tanks and hydrotables. So when I get a leak it doesn't mess up the entire building.

Appreciate the the advice though!
 
i think this is doable. heres what you do. install a ridgevent all along the peak of the roof a nice metal one if your not sure what that is google some photos. next put vents running all the way up the underside of the roof between your roof rafters to connect to the ridge vent often they are made out of styrofoam you staple them on they need to run the entire legnth from the soffit to the ridge every cavity. make sure there is proper venting in your soffit as this is where the air will flow from up to your ridge. as for not having enough room for insulation that is not a problem all. you will figure out the correct amount of room you will need for your batts (whatever the correct size is for your exterior walls on the building depending on the climate where your house is) you will take that size and figure out how thick your furring will need to be to have enough room to place these batts of insulation ontop of your styrofoam vents you just installed. rip the appropriate size furring on a table saw. nail this wood to the edge of each rafter now you have enough room for your insulation install your vapour barrier and drywall. and install a mini split theres not enough passive ac to cool that space. grats you have a concealed grow op in your attic :D
 
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