First time grow room, and the headache I encountered.

Los Reefersaurus said:

This is not correct! mold on the wall means the wall is too cold for the amount of RH
You are going to have some serious mold problems unless you sort out your walls more.
I recommend insulating with at least 1/2 " of Styrofoam plus at lest a layer of door skin on top. PLus insulate the floor as well.
You should be able to run your room at 75 to 80 percent humidity and not have condensation or mold issues.
Solve your issues now before they manifest later.
If you leave it you might make it thought the summer but when the fall hits........

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And vapour barrier lol. Keeping the humidity down helps as well, and no 70% is a tad high but keeping it low is not the cure. At 75% and 75f the dew point is pretty high at 66f so it would depend on the OPs location but yup insulation. The big issue with grow ops is the negative pressure and the cold air it draws from everywhere it can, so if not sealed air tight except for dedicated intake, the moisture gets in behind walls and pretty much everywhere this happens there will be mould. It's quite likely that if a house here is deemed a grow OP it will require gutting if reselling, that's why I grow in a garden shed lol.

Budley Doright said:

And vapour barrier lol. Keeping the humidity down helps as well, and no 70% is a tad high but keeping it low is not the cure. At 75% and 75f the dew point is pretty high at 66f so it would depend on the OPs location but yup insulation. The big issue with grow ops is the negative pressure and the cold air it draws from everywhere it can, so if not sealed air tight except for dedicated intake, the moisture gets in behind walls and pretty much everywhere this happens there will be mould. It's quite likely that if a house here is deemed a grow OP it will require gutting if reselling, that's why I grow in a garden shed lol.

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I am not saying start your grow at 75% RH at 84 degrees I am saying that your room needs to be able to deal with that environment or it isn't set up properly . It akin to maybe you should build that bridge so that you can drive a truck over it even though only cars are driving over it now, after all you might have a truck drive over it at one point.

Bottom line that we agree on this room needs insulation

lights out for an hour is nothing to be concerned about.

Los Reefersaurus said:

This is not correct! mold on the wall means the wall is too cold for the amount of RH

You should be able to run your room at 75 to 80 percent humidity and not have condensation or mold issues.
........

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ok, lets check that logic.

while I fully understand the importance of keeping indoor conditions separate from outdoor conditions.......
no matter how much insulation one installs, RH will be the factor when attempting to stave fungus?=RH is the issue. for example..
when insulation is in place, and his 80% RH causes mold on the floor, will it be the floor temps fault?=RH
At 80% RH his plants will have bud rot too, will this be the fault of the plant temps? =RH

Your both right lol. You do want to keep humidity down and you do want insulation and you do want a vapour barrier. This is all based on the ops climate as well.

Los Reefersaurus said:

I am not saying start your grow at 75% RH at 84 degrees I am saying that your room needs to be able to deal with that environment or it isn't set up properly . It akin to maybe you should build that bridge so that you can drive a truck over it even though only cars are driving over it now, after all you might have a truck drive over it at one point.

Bottom line that we agree on this room needs insulation

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It kind of all depends on ops climate as to what the room needs and how much.

Los Reefersaurus said:

I am not saying start your grow at 75% RH at 84 degrees I am saying that your room needs to be able to deal with that environment or it isn't set up properly . It akin to maybe you should build that bridge so that you can drive a truck over it even though only cars are driving over it now, after all you might have a truck drive over it at one point.

Bottom line that we agree on this room needs insulation

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As for Chemphlegm, Los Reefer isn't telling me to nuke my room with 75% RH 24/7. What he's saying is a building constructed properly should be able to maintain a 75% RH level without signs of molding on walls. Which I agree with.

I'm not disagreeing with you at all. I understand and agree that a perfect room could have 70+ percent RH and shouldn't have any signs of molding. The entire barn was finished as I was doing this room. The roof leak is sealed and it has been raining like crazy here! So far there have been no water signs inside the new sheetrock/walls(previously you could see water coming from the roof, it was awful). I knew what was wrong the moment I stepped into the barn (have helped build houses but never have done something to this tier by myself). My dad was kind enough to lend a hand after having 40+ years of building houses and contracting.

My reply to you wasn't intended to be short posted / im a know it all. Was very stoned and tired lol. I get were you're coming from and I appreciate your input. It rains almost every week here in Oregon so if the mold comes back my plans will be cut short(very, very low chance of mold coming back). I already plan on tearing down this barn once I'm done with it and using the foundation for a 4car shop (my evo is constantly breaking down lol). While that's going up I'm going to also foundation around 1000-1500sqft for a recreational grow..

420dankestnugs said:

Here's a picture of the grow cabinet. Instead of getting a generic heating mat I decided to use one I already had(shoulder heating mat ). It turns off every 45 minutes so I usually have it on a 45/30 on/off timer. The seedling is really enjoying it in there. These pics are from yesterday, already much taller and leaves starting to come out more. I'm going to be doing the rest of the seeds once this is transferred to a pot. This was a test to make sure it was under good growing conditions before I go all out.

On another note, do you think adding a fluorescent light strip on the top would be overkill? I wouldn't need to be growing from seeds anymore with a good mother plant. Do you think there's enough room for a mother plant? Also, is there anyway to make sure a mother plant stays somewhat small?

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Get a dehumidifier mate.

budman111 said:

Get a dehumidifier mate.

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I went out and bought one a few days ago, works great!

420dankestnugs said:

Read my previous post about my mold situation. I took all the precautions I could to prevent mold from happening again.



The mold was only there because the upkeep on the barn/garage was non existent with the previous property owners. There was a leak on the roof that I did fix. There are no more leaks, no more black mold, and an RH of 35% consistent throughout the entire building (with dehumidifier, 40% without). It's also still raining like crazy out here so I'm not too worried that it will come back. Like I said I've got the funds to construct an actual rec grow but I want experience before I completely dive in. I have grown since I was 16 in makeshift boxes, outdoors, etc. Nothing crazy but It's something that's always interested me(22 now). With it being legal in my state I've decided to leave the business I was currently in to focus on this full time.

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Fair dues man much respect

Budley Doright said:

And vapour barrier lol. Keeping the humidity down helps as well, and no 70% is a tad high but keeping it low is not the cure. At 75% and 75f the dew point is pretty high at 66f so it would depend on the OPs location but yup insulation. The big issue with grow ops is the negative pressure and the cold air it draws from everywhere it can, so if not sealed air tight except for dedicated intake, the moisture gets in behind walls and pretty much everywhere this happens there will be mould. It's quite likely that if a house here is deemed a grow OP it will require gutting if reselling, that's why I grow in a garden shed lol.

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Been growing indoor for yrs n omce airflows good no mold should appear infact the dehumidifier would auck in alot of spores or ur old ladies tights at the intake

Wed constant mold in our old house but never in my grow room so airflow os the key imo

Yes air flow is a good thing. There are many factors that will encourage mould growth, one being humidity levels. In cold climates it is important to maximize air flow, and this inturn brings in cold dry air to basically dehumidify the space and exhaust the wet warm air. Again controlling the intake to a dedicated location will stop moisture from entering the wall cavity where there is leakage. Also a pair of stockings will not stop a mould spore, just an FYI.

Budley Doright said:

Yes air flow is a good thing. There are many factors that will encourage mould growth, one being humidity levels. In cold climates it is important to maximize air flow, and this inturn brings in cold dry air to basically dehumidify the space and exhaust the wet warm air. Again controlling the intake to a dedicated location will stop moisture from entering the wall cavity where there is leakage. Also a pair of stockings will not stop a mould spore, just an FYI.

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this is the very reason I decided to seal up my rooms and stop using outdoor air. Its simple to control a room thats sealed, not so much when the outside air dictates the inside conditions, often struggling to condition it properly. I found it to be near half the cost
to control when sealed up, c02 augmentation is the only bummer I note in a sealed room. added heat, added humidity, but not near the scale of indoor/outdoor air circulation.

chemphlegm said:

this is the very reason I decided to seal up my rooms and stop using outdoor air. Its simple to control a room thats sealed, not so much when the outside air dictates the inside conditions, often struggling to condition it properly. I found it to be near half the cost
to control when sealed up, c02 augmentation is the only bummer I note in a sealed room. added heat, added humidity, but not near the scale of indoor/outdoor air circulation.

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A heat recovery ventilator helps to recoup some of the heat expelled in winter but yup heat in warm months is hard to deal with. I have all the stuff to do CO2 but right now I have enough to deal with. Not wanting to do the whole cooling unit, etc. I move outdoors in the summer lol.

Update of the plants. Here's when they all started sprouting.


These pics were from the past few days.


I plan on making this little guy my mother plant.






Lastly, here's my troubled Blueberry plant. I was told by a buddy that it looks like Calcium deficiency. Gave it some Cal-Mag and it seems to be doing much better. What do you guys think? Should I just keep treating it with cal-mag and nutes? Does it seem like more then a calcium deficiency?

I'm planning to grow in my 7.5m x 3.75m workshop steel shed. Anyone have any tips or a detailed walkthrough page that I can check out? Thanks guys.

Amelia Wiliiams said:

I'm planning to grow in my 7.5m x 3.75m workshop steel shed. Anyone have any tips or a detailed walkthrough page that I can check out? Thanks guys.

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I bought Marijuana Horticulture written by Jorge Cervantes that helped tons! If you have specific questions that you need or run into feel free to message me or drop a reply I'll be more then willing to help out.

On another note. Haven't been using computer much been so busy. Here's an updated picture of one of my White Widows. Only 30days into flower.

420dankestnugs said:

I bought Marijuana Horticulture written by Jorge Cervantes that helped tons! If you have specific questions that you need or run into feel free to message me or drop a reply I'll be more then willing to help out.

On another note. Haven't been using computer much been so busy. Here's an updated picture of one of my White Widows. Only 30days into flower.

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Looks beautiful! Thanks for the tip. Will look into it.

Amelia Wiliiams said:

I'm planning to grow in my 7.5m x 3.75m workshop steel shed. Anyone have any tips or a detailed walkthrough page that I can check out? Thanks guys.

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Temperature is the biggest headache,

You can use your exhaust fan to help cool the room (duct it outside) and also as a heater (dont duct out of the shed).

This is of cause not an ideal solution but may help you a little. If you can insulate the shed it will help immensely.

Here are some of the babies. 1.5weeks away from harvest. May overcook them for a headier high. Have more patients now. Thinking 16-20 plants the next go.