Need grow room advice

I’m building a grow room just need some advice on what would be the best reflective material to use. Is reflective insulation good to use?


I’ve heard of growers will use mylar sheets. Shouldn’t be necessary if the walls are painted white.


I agree with @MidwestGuy flat white paint.


Silver Mylar. What most tents are made of.


From: Compare Grow Room Wall Coverings: Mylar vs. White Paint vs. Vinyl GrowWall™

  • By Haley Thomann

Flat or matte paint is probably one of the most affordable grow room wall options. It is extremely economical if you have a large grow facility to cover. Cannabis growers will steer you away from using high-gloss paint because it may create grow room hot spots. But, white is always the preferred choice for any grow room wall covering because white reflects light better than metallic colored or silver wall covering. Flat white paint has the ability to reflect between 75-85% of your indoor lighting source. You won’t get pockets or bubbles with paint, so you won’t see problems with hot spots either.

Although paint’s greatest advantage is price, it lacks many characteristics that can enhance grow room productivity. Other than reflectivity, paint does not aide in insulating or cooling your growroom. Organic cannabis and medicinal marijuana require sterile growing spaces. Even though paint is easy to clean, it still collects debris on its surface. It is recommended you add a fungicide when painting which will increase the cost of the overall project.

Maybe the biggest downfall to paint is the labor, and once completed, paint is one of the most permanent greenhouse coverings. You need rollers, brushes and other supplies for a paint project and at least two coats for full coverage. It will take a few days for complete drying and to rid your indoor grow room of any crop damaging fumes.


Developed by NASA, Mylar is a synthetic, reflective, shiny, silver greenhouse covering available in sheets and rolls. Pricing for thin Mylar films has gone down in recent years and more durable, thicker versions, such as Foylon, have stormed onto the greenhouse products market. Foylon is spun polyester fabric more resistant to tearing and is easier to clean. Indoor cannabis growers like Mylar’s ability to reflect light anywhere from 90-98%. Good grow room ventilation is necessary if using Mylar.

Mylar does pick up dirt decreasing its ability to reflect light. When it comes time to clean, Mylar grow room wall coverings must be taken down to wash. If installed using tape, that can create problems with tearing and creasing. Even if using Velcro to adhere to walls, it is tough to avoid rips and folds. Mylar usually needs replacement after only a few grows.

When installing Mylar film, it is imperative the film remains completely flat. If not, bumps, bubbles and air pockets form causing hot spots in the grow room and reduced reflectivity. As long as Mylar sheets aren’t damaged they are reusable.

Mylar is not completely light proof or airtight, so it does not aide in growing cannabis organically or producing a more potent marijuana plant.

GrowWall™ Wall Coverings for Grow Rooms and Greenhouses

Groundbreaking GrowWall™ is a premium, solid polyvinyl greenhouse product manufactured in the USA by Better Life Technology, the makers of G-Floor® Universal Flooring, AquaTread® Marine Flooring and BILD™ Print Media vinyl graphic flooring and wall coverings. GrowWall’s premium polyvinyl engineering makes it one of the most durable, low maintenance grow room wall coverings available. It may not be the cheapest option, but with an array of growing benefits that actually enhance the cannabis bud and yield, GrowWall provides cannabis growers excellent value.

Constructed of 35 mil thick 100% polyvinyl in Absolute White, GrowWall’s ceramic texture and ultra-reflective top coat has proven to reflect light over 400% more than traditional greenhouse coverings, including Mylar and paint. This advanced top coat reduces glare, hot spots, and resists UV-rays, helping distribute lighting more evenly throughout the growing space.

In addition, waterproof GrowWall resists mold and mildew and helps create a lab-like growing environment without microbes and bacteria. Its white surface also aides in spotting harmful bugs and debris. GrowWall’s vinyl qualities make it less prone to tears, scratches, peeling and curling; GrowWall lasts grow after grow without deterioration and replacement.


Thank you!!

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Sure sounds nice. Runs $450-600 per wall in the bedroom I grow in, not to mention the ceiling. Only like $3000 later I’d have an awesome grow room. :scream:

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