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Top 10 Frequently Asked Questions About Spray Foam Insulation for Grow Rooms
Amanda Ringler

By: Amanda Ringler on November 4th, 2019

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Top 10 Frequently Asked Questions About Spray Foam Insulation for Grow Rooms

closed cell spray foam  |  spray foam insulation  |  humidity  |  moisture  |  open cell spray foam  |  marijuana grow room

Whether you’re cultivating marijuana for personal use or for your business, you need your grow room insulation to be on point. 

Spray foam insulation is one of the best options available for grow rooms to achieve the precise environment the marijuana needs to thrive in.

If you’re considering spray foam for your grow room, you probably have a lot of questions. RetroFoam of Michigan has you covered as we’ve compiled a list of the frequently asked questions we’ve gotten concerning grow rooms and spray foam insulation.

Top Spray Foam Insulation FAQs for Grow Rooms

Cultivating marijuana is a fairly new endeavor in some states, so here’s a list of the questions we’ve been asked by growers as they prepare their grow room.

Will Spray Foam Keep the Smell In?

The quick answer is yes, but you shouldn’t get spray foam just for odor control.

Foam insulation creates an air barrier and odor travels through the air, so it can definitely help reduce the odor from seeping out. With that being said, there are things that are out of the control of the spray foam – like doors or other openings.

Will Spray Foam Keep the Bugs Out?

Spray foam insulation seals up all of the nooks and crannies where it is installed.

Keep in mind, if there is an existing bug problem spray foam won’t fix it. Spray foam will, however, work to prevent future pest problems.

Will Spray Foam Help with Moisture in a Grow Room?

Heck yes it will!

How you ask? That’s simple. You need to maintain a specific humidity range and spray foam can help with this because it makes the grow room an airtight and conditioned space. Spray foam also doesn’t retain any moisture it comes into contact with.

Can Spray Foam Be Painted?

It sure can.

When painting foam insulation, it’s best to wait about 24 hours after installation before painting it. This gives any dust that was kicked up during the installation a chance to settle. We recommend spray paint instead of a roller or brush as open cell spray foam tends to be softer than closed cell.

How Close Can the High-Pressure Sodium Lights Be to the Foam?

You need special lighting in a grow room and spray foam allows for that.

The high-pressure sodium lights get pretty hot, but they can safely be a couple of inches from the foam with no worries.

How Does Spray Foam Affect Controlling the Temperature in a Grow Room?

Controlling the temperature in a grow room is super important and spray foam insulation can help.

Because spray foam creates an air seal, it keeps the air you pay to treat right inside that room where you want it. The insulation also works to keep outside air out, thus working to help control the temperature right where you want it.

Does Spray Foam Have a Vapor Barrier?

It depends on which spray foam you decide to go with.

Open cell spray foam does not have a vapor barrier built into it, whereas closed cell spray foam does.

Will Spray Foam Let Light Inside a Grow Room?

No, it will not let light into your grow room. 

Spray foam, whether it’s open cell or closed cell, is dense enough to keep light from passing through it.

Is Open Cell or Closed Cell Spray Foam Better for a Grow Room?

This honestly depends on how your grow room is laid out.

If you plan on finishing the walls, the open cell or closed cell will work. If you plan to leave the walls exposed, closed cell is the better option as it is a denser material and can handle the bumps and knocks against it.

How Much is Your Minimum Charge?

All foam insulation contractors have a minimum charge that varies from business to business. Our minimum charge is between $1,200 and $1,300 depending on the scope of the project and the spray foam insulation used.

Learn More About Grow Room Spray Foam Insulation

Hopefully, you found these FAQs helpful in your educational journey.

If you’d like to extend your spray foam insulation knowledge even further, we have a ton of resources in our Learning Center.

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About Amanda Ringler

Amanda previously has worked as a breaking news and crime reporter, TV news producer, and editor in Flint and Detroit. Throughout her career as a journalist, she has won several awards from the Detroit Chapter of Society of Professional Journalists and the Michigan Press Association. As part of the RetroFoam of Michigan family, Amanda uses her experience as a journalist to write content that will help educate homeowners on the benefits of foam insulation. When Amanda isn’t writing, she’s spending time with her husband and rescued huskies. She also loves knitting, making art, cooking, and hosting dinner and a movie night for friends and family.