Light Dep High Humidity Advice Help

[robz]

Greetings all. I am week 5 into light dep and when I cover at 5:30 pm at night humidity spikes to 99% when I uncover it at 10:00 pm.
Any advice on how I can mitigate this high spike in rh? Thanks on advance.

 

[MendoGiantZ]

Are you doing an open air light dep or do you have a plastic cover on. Pictures help. You can go to the grow store and buy a couple big cheap 12 inch exhaust fans and run ducting underneath the blackout tarp to keep the air moving a lot better

 

[robz]

Yes plastic over greenhouse with blackout tarp over the plastic. Have 8 circulation fans and exhaust fan going 24/7. In the northern coastal region of Or. So the weather here if pretty high in humidity already.

 

[jumpincactus]

Ventilation & Circulation .......easy peasy

 

[jumpincactus]

Oh shit Oregon, sorry not so easy with all of the ambient high Rh. This will take some planning.

 

[jumpincactus]

So if your pulling air from the surrounding atmosphere that is laden with moisture you will have to DH it before it goes into your light dep area.

 

[MendoGiantZ]

Is it a hoop house with pvc or a high end really nicely built greenhouse ??

 

[MendoGiantZ]

If it's a nice greenhouse that is pretty airtight a couple nice de hums would be a great permanent fix to this issue.

 

[robz]

It's a gable style greenhouse with a door. Not 100% sealed but pretty air tight. The exhaust fan has plenty of draw with a breathable wall attached to keep light out. Besides that I now have 12 circulation fans all running 24/7
The humidity here has been 70-80% for last week or so. When I cover is the main issue. I've tried putting all 3 of my dehumidifiers in there but with the exhaust fan off it's too much plant material 59 total some 7 footers in there. Leave exhaust fan on and it's pointless to run the dehumidifiers. At this point no PM or bud rot mid week 6 so just hoping for drier weather after the holiday.

 

[500lbs Guerilla]

Your inside humidity won't drop below your outside humidity without some sort of dehumidification. If you're moving enough air through the greenhouse, it shouldn't spike to 99% though. I use an inline fan to blow air into my dep, and an online fall to éxhaust too. Ducting buried under the ground for the light. Never gets higher than 80% even when it's raining, and stays around 50% even if I'm watering with the tarps on. I'm in a pretty dry place though.