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How To Set Up An Indoor Grow Room For Cannabis

Whether starting with a single grow tent, a stealth grow box, or a full scale commercial marijuana grow room, how you set up your growing space goes a long way in determining your final yields. In this chapter we’ll cover the 6 most important factors for setting up a successful grow room for your cannabis plants.

Growing indoors will provide you the power to influence all necessary inputs for growing big, healthy, cannabis plants with those big, sticky buds you dream of. This includes lights, nutrients, water and humidity, ventilation as well as temperature. Instead of being dependent on weather and soil you can optimize your production for maximum yield.

A Grow Room That Your Plants Will Love

Setting up a growing facility isn’t cheap. Even the basics requirements needed can add up cost-wise. The main advantage is that indoors you are protected from natural challenges and road blocks. So setting up might be more complicated than outdoors but the results and your margins will be a lot greater. Testing things out with a single grow box might be a good solution to get started because they provide many factors needed for growing growing cannabis on a small scale.

You are probably looking for a strain that grows quickly, is easy to grow, produces much bud and has high potency. But wait… there is more to it!

Always keep in mind that the general idea is to create an environment where your plants will prosper. The better they carry out their photosynthesis, the better your output in regards of quantity and quality, what growers refer to as “yield”. We will now study in great detail what your plants need:

1. Light: Lamps, Reflector and Wall Color

Your plants need light to carry out photosynthesis. However: Find a room that is completely lightproof. This will allow you to carefully choose the hours of light and darkness. In the vegetative phase your plants will need 18 hours of light, 6 hours of darkness. In the flowering phase 12 hours of light and 12 hours of darkness.

You can choose LED or HPS/MH lighting for your indoor production. A 400-Watt for vegetative phase and a 600-Watt HPS lamp for flowering phase for every square meter will be a great start. If you can make the investment use LED lamps because they will last forever, and the technology is finally catching up to the HID (HPS and MH) lamps most professional growers have used for years. See our full info on lights here.

To make the best out of your lighting use reflective walls. White walls work best for reflecting light, whilst dark or black walls will absorb the light.

Use a time switch to make things easy for you and create the best lighting experience for your plants.

2. Ventilation and Air Circulation

Make sure to find a room or grow tent that is airtight. The stench of marijuana could easily reach and bother your surroundings. Whilst air circulation and fresh air is very important, make sure that all your out-going air will pass through a carbon filter. An air extractor will remove the heat for the lamps to keep the temperature stable as well as remove the odour of the plants.

Your plants will need fresh air as well. During photosynthesis the plants take CO2 (carbon dioxide) and transform it into oxygen and sugars. The closed environment of a grow box will need a hole or entry point to supply fresh air and CO2 for your plants.

Use a fan for consistent air circulation. This way temperature and CO2 will spread evenly throughout the room.

3. Watering System and Humidity in a Grow Tent

Water running from your pots to the floor is inevitable. So best to keep your house and production safe with a waterproof floor.

Find our article on the perfect amount of water for your plants.

Humidity describes the amount of water in the air. You will need just the right amount of moisture in the air that will push the growth of your plants will at the same time not too much humidity because it will cause fungus and mold.

4. Temperature

As said in the part about air circulation, an airflow system and a fan will help you to prevent overheating of your plants.

Temperature is crucial for the photosynthesis of your plants and more over for the tasting for your results. Make sure to align the temperature to the hours of light and darkness. You gonna want a higher temperature throughout lighting time than during darkness.

Best temperature will be 77. Don’t go below 64 and don’t go higher than 86. The lamps should provide enough heat during the day. However consider that you might need extra heating during the night.

5. Nutrient Delivery

Nutrients are vital for the health of your plants. Make sure to measure them on a regular basis and change your actions accordingly. It will be important to provide nitrogen, potassium, and phosphorus for your plants.

There are different nutrients blends that you can use. It will also depend on the growing cycle of your plants, and you’ll need to be careful not to go overboard and burn your plants with too much. Nitrogen toxicity is a common downfall of too many grows.

6. Security

Make sure to seal your windows and use a carbon filter against the marijuana scent. Think about using extra locks or even cameras especially when growing in a warehouse. Don’t put your crop at risk.

Think about different scenarios and how you could prevent them. Better act now than in crises.

Creating the right lighting, air flow, humidity and temperature will change your production output massively. A grow room will provide a unique learning and business experience for you.

The Cannabis Grow Room Setup Checklist

Below is a quick checklist for setting up your grow room. Each of these steps has more to them than what we can include here, but not to worry, we’ll go into each in detail in the coming chapters. But for now, this is a good general checklist to follow:

  • 1. Create a blueprint. Whether you choose a basement in a residential area or a warehouse it is best to start with creating a blueprint for growing indoors. How many square meters you have will largely determine how many plants you can put.
  • 2. Prep the space. Make sure to remove all things not needed like carpets, decoration and furniture, and that you have electricity and plumbing accessible in the right proximity to where you plan to place your pots and lights.
  • 3. Set up the light and water systems. Hang your light fixtures, run the necessary wiring, plug them in and test each one. Connect and test the water system.
  • 4. Prep the pots. Lay out your pots, soil/growing medium and seeds/clones in the appropriate quantity and arrangement according to your blueprint. Make sure everything is going to line up as expected and you have the right quantities of everything you need.
  • 5. Start planting. More on this to come in Chapter 3!

As we shared before, a grow tent can be a quick and easy introduction to growing hydroponics. These steps can be scaled up or down to any size, so often it’s best to work through the kinks and see the process through with a single plant or handful of plants before scaling up.

Updated: December 17, 2019

Whether starting with a single grow tent, a stealth grow box, or a full scale commercial marijuana grow room, how you set up your growing space goes a long way in determining your final yields. In this chapter we'll cover the 6 most important factors for setting up a successful grow room for your cannabis plants. Grow

How to Build a Grow Room

If you’ve ever thought about growing cannabis indoors, you may have been faced with a tricky question; should I buy a grow tent or set up a grow room? If you’ve decided to go with the latter, we’re going to go over the basic things you’re going to need to turn a normal room into an indoor grow set up without needing to spend a ridiculous amount of money. Read on to find out exactly how to build a grow room for your cannabis plants.

It generally costs more to turn a full room into a grow room rather than simply buying a grow tent; you need to prepare the entire room so that it can efficiently hold and keep cannabis plants alive. Although it may cost a bit more, it’s definitely a much comfier way to grow cannabis. You can get larger yields, grow larger plants and have enough space to get everything done in the one room, which can be difficult in grow tents.

In order to set your grow room up properly, we’ve decided to cover it in this post; we’re going to go over the absolute basic materials needed to set up an indoor grow room. Get everything set up without needing to spend too much money.

Disinfecting and Hygiene

One of the first steps of any grow step is making sure that everything is properly clean. This is done when growing using both grow tents and growing in a room – you need to clean the room and disinfect it before you can start growing your cannabis. We recommend using a product called Purolyt to clean your grow room.

If you clean your room thoroughly before you start growing, you’ll be able to keep insect and fungi infestations at bay for much longer, which is incredibly important – if your indoor grow room becomes infected it can be quite hard to get rid of it for your next grow.

How to Build a Grow Room | Deciding your set-up

When growing in a wide open area such as a grow room, you’ll need to know how many grow lights you’re planning on using. In this case, we’re going to use two 600w HPS grow lights in a 2 x 2 x 2.2m room. If you want to follow this method, you can also use three 315w LEC lights for similar results.

The amount of lights and their wattage has a direct impact on the strength of your extraction fan and inline fan.

Grow Room Reflective Sheeting

You need to block any and all light from getting into your grow room. You’ll also need to get proper reflective sheeting in order to cover the walls, floor and ceiling of your grow room. You can cover the walls to about a meter and a half if you want to save on materials. We recommend using a stapler to attach it to the walls and ceiling, as double-sided tape can easily come unstuck once the room heats up.

How to Build a Grow Room | Setting up your ventilation system

Once you’ve covered the room with reflective sheeting, you’ll need to prepare your air intake and extraction system. First, make sure nothing can be seen from outside your apartment through the window.

Many people think that the best way to set this up is by placing the extraction duct at the top of the window and the inline duct at the bottom. This is a major mistake – most likely you’ll end up taking in the exact same air that you’re trying to ventilate out of the room. One of the most simple ways to do this is to use the window to extract air and then make a grid on the door to the room. This is called passive intake and doesn’t require any sort of inline fan.

You may have other options though, depending on the size and set-up of your grow room. Most rooms used for growing only have one window, although if your room has a different set up, feel free to make your own extraction system, this is just the simplest set up.

Ventilation System

Once you know where you’re going to be setting up your ventilation system and how you’re going to be supplying fresh air, you’ll need to install the extractor fan and inline fan, if you’re using one.

Extractors can be noisy and cause vibrations that can travel through the wall and floor, which can be heard from other rooms and floors. You’ll need to use a soundproofed box in order to avoid this. It’ll have to be attached to the ceiling, and you can use a frame designed for this purpose or a chain system using rubber rings which stop vibrations from travelling up through the ceiling.

When it comes to the inline fan, if you’re going to use one instead of just using a passive intake vent, it’ll need to be on the other side of the room in comparison to the extraction fan. You’ll need to place it down low. If possible try and use some sort of cushioned base to avoid the vibrations travelling through the floor.

Carbon Filter

Once you’ve set up your ventilation system and everything is in its place, you’ll need to add a carbon filter. You can do this when preparing the grow room or wait until your plants are flowering. It’s much easier to set it up at the start, although you’ll be using it more than you need to. If you wait until the flowering period the filter will last much longer.

In order to attach it to the ceiling you’ll need to use rope and eyebolts. You’ll also need flexible aluminum ducting in order to connect the filter to your extraction fan. If you want the best possible ventilation, try and center the filter as much as possible.

How to Build a Grow Room | Connecting your Aluminum Ducting

Like we said before, you’ll need to connect the filter and extraction fan in order for them to work correctly. Use clamps to attach the ducting to your filter, and do the same with the other end to the extractor fan. Try and keep the ducting as straight as possible to keep the airflow strong. Lastly, you need to connect your extractor to wherever you’re planning on extracting hot air.

If you have an inline fan it’s not that hard to attach the ducting, the difference is the size of the intake fan, which is usually smaller than the extractor. You can also do this using clamps to make it easier.

Lighting Kit

Once you have your extraction system, intake and filtering system installed and you’ve covered the walls in reflective sheeting, it’s time to start installing your lighting kit.

The best way to do this is to keep your ballast outside of the grow room due to the amount of heat that they generate. However, this may be an added benefit when it comes to growing during colder months, although during the springtime and hotter months it’s not a good idea. If you can’t keep it outside of your grow room, you’ll need to place it on a wooden shelf up high and as far away as possible from your plants.

In order to hang your lights correctly, you’ll need to measure out how much space each light is going to cover and find the exact center of the bulb in order to make the right hole in the ceiling for your plants.

Fans

Although you have a ventilation system, you’ll still need a way to move air around your room. We recommend using standing fans or clip-on fans on the wall if you have the space, although the choice is yours. You’ll need to place them strategically in order to help distribute any new air you’re taking in so that you don’t end up with stagnant air pockets. Cannabis plants need constant fresh air to survive.

Timing System

Growing indoors requires quite a lot of electric devices that need to be turned on and off at specific times; you’ll need to use a timer system in order to keep them working properly. The best way to do this is to get a full controller system that allows you to program everything on the one system.

You should try and place it somewhere that you can get to easily while also keeping all of the cables in order. We recommend installing a fire extinguisher above the controller in case of emergencies.

Thermo-hygrometer

Once you’ve set up everything else in your grow room that you need to successfully grow cannabis, you’ll need to check that everything is working correctly so that you can germinate your cannabis seeds. Before doing this, you should place a thermos-hygrometer between your lighting systems in order to check the parameters that you’ll be growing at.

You might have just the right temperature for growing cannabis, although humidity levels will probably be much too low for cannabis plants to grow properly during their first few weeks. This is due to the fact that you’re growing in a large room; it can be complicated to maintain the temperature and humidity at the right levels when compared to growing in a grow tent.

Humidifier

When working in such a large space you’ll need to add humidity to the air somehow, and the best ways to do this is by using a humidifier, or maybe even a few. During your plants’ first few weeks, relative humidity needs to be a bit higher than usual – if it’s not, your plants may not grow to be the best that they can be.

For the best results, you should place the humidifier in the middle of the room alongside a fan, which helps to distribute humidity evenly. If you can, try and move it to the other side of your plants after a few hours in order to avoid the plants closest to it getting a bit too much humidity, which can end up causing fungi.

How to Build a grow Room | Conclusion

When it comes to growing cannabis indoors, setting up an entire grow room can be a bit more complicated and costly than a simple grow tent.

The most important things to keep in mind are that nothing should be seen from outside the room and your extraction system and filter should be working properly; if not, you may get in trouble.

This particular post is designed for those that are going to be growing using two 600w lights and only details the basic materials needed. If you have a better set up or use more advanced methods, that’s great! This is simply a basic guide for an affordable indoor grow set-up for those that have never grown in a room before.

If you want to grow cannabis indoors but don't know how to build a grow room, don't worry! We've designed a guide to show you what you need & how to use it