Ask a Question forum: Greenhouse Humidity Control

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Southeast US (Zone 8a)
Feb 7, 2017 12:46 PM CST

I am building a greenhouse in my back yard, which will be my first experience with greenhouse gardening. I'm using it primarily for succulents, so I'm concerned about humidity control. I'm building a small "deck" (really just a platform) out of ground-treated lumber to keep it directly off the grass, but I'm not sure what I should do under the deck to ensure I'm getting good drainage.

Do I need to think about installing a vapor barrier of some kind between the greenhouse and the deck to prevent humidity from the ground collecting in the greenhouse? Most of what I have seen has emphasized drainage, but since it's on a wooden platform (with space between the boards), I'm not too worried about immediate drainage.

Thanks so much!
Name: Karen
NM (Zone 7b)
Region: New Mexico Region: Arizona Cactus and Succulents Plays in the sandbox Greenhouse Sempervivums
Bromeliad Adeniums Avid Green Pages Reviewer Brugmansias Garden Ideas: Level 1 Tropicals
Feb 7, 2017 12:52 PM CST
I have a greenhouse built directly on the ground. The floor is gravel and pavers on top of the gravel. I have a lot of succulents and cacti in it along with many tropical plants. I also have a water tank inside that helps with keeping it warmer in winter. I have 3 vents and a door that stays open most of the summer. I do run a fan 24 hours and have heat in winter. I haven't done anything to control humidity. It's normally low during the day and goes higher at night when everything closes. My tropicals are growing well and I haven't noticed any problems with my cacti or succulents.

Keeping the insects at bay is a much bigger problem than humidity.
Handcrafted Coastal Inspired Art SeaMosaics!
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Feb 7, 2017 1:28 PM CST
Everything Plantmanager said. I grow cactus, succulents, orchids and other tropicals. The humidity is high when the vents are closed and low when they open. I have 6 RV fans to keep the air circulating 24/7. I have a concrete floor with drains and a 'pond' inside.

I think putting in a vapor barrier would cause problems in the long run. It will have the opposite effect than what you intended - more moisture held inside the GH.

You are probably going to rot your deck. Anyway you could build it on the lawn?

Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost


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