Harbor Freight Greenhouse Modification

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Custom Modification Pieces used in our greenhouse build.

Southern Homestead Transformation build video, thanks for the support!

Original price was: $59.99.Current price is: $49.99.

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Harbor Freight Greenhouse Modification

(patent pending)

Some of the items we designed and 3D printed for our greenhouse build.  The Harbor Freight Greenhouse Modification is perfect if you haven’t built your greenhouse yet.  For a step-by-step guide on how to use these items and other helpful tips during your build, check out our YouTube video.  Our video is very detailed and is separated into chapters for easy navigation.

If you have already constructed your greenhouse and you want to avoid worrying about the panels, we offer a spacer-only mod kit.

Are you needing to just inject silicone into your panel?  We have that tool too!

Quantities are based on the Harbor Freight 10×12 greenhouse product.  If you need different quantities or something else custom, please send an email to info@thirtyonecrafts.com

Below are Amazon links for the additional items we used during the construction of our Harbor Freight 10×12 Greenhouse.

All the items we designed and 3D printed for our greenhouse build.

This 3D printed kit will take around 24 hours to complete. If it is currently out of stock, we will have more available soon. We appreciate your patience and understanding.

Quantities are based on the Harbor Freight 10×12 greenhouse product.
If you need different quantities or something else custom, please send an email to info@thirtyonecrafts.com

This kit includes the following items.

Image 60 – Center Panel Spacers

(Patent Pending)

Used when securing the center of panels to the horizontal bars.

*** 55 Total Needed ***

  • 4 Front Panels (none in the door panels)
  • 12 Roof Panels (none in windows/vents)
  • 15 Back Panels
  • 12 Left Panels
  • 12 Right Panels


Image 70 – End Panel Spacers

(Patent Pending)

Used for securing the ends of panels to thin strips on the frame.

*** 61 Total Needed ***

  • 7 Front Panels
  • 6 Back Panels (2 at bottom center either side of base channel splice)
  • 12 Left Side Panels
  • 12 Right Side Panels
  • 24 Roof Panels (none in windows/vents)
Image Silicone Tube Tip Tool

(Patent Pending)

Used to help put silicone into the ends of the panels, takes a little practice

We send 2 so you don’t have to worry about cleaning them up, just toss them in the trash.

  • 2- Silicone Tube Tip Tool

Harbor Freight Greenhouse Modification

Links to the other items we used in our build:

Qty Link
2 Glazing Clips 100 Pieces
9 Duck Brand Foam Weather-strip
10 Frost King 1/2″ Rope Backer
2 #8 x 3/4″ Self Piercing Screws
2 #8×1/2″ neoprene Washers
1 Gorilla Clear Silicone Caulk 6pk

Disclaimer:  We offer no warranties nor guarantees that these items will prevent any damage to your greenhouse.  It is also understood that these items will be used at your own risk and liability.  These pieces are small, so please keep them away from small children.

Weight 1.1 lbs

Black, Silver/Gray

4 reviews for Harbor Freight Greenhouse Modification

  1. Larry Lisk

    If you’re going to build a Harbor Freight greenhouse you need to order this mod kit. I can’t imagine how it would be without using this kit. It really strengthens the greenhouse. Also watch the video to get some very helpful tips. The handy tool for filling the end panels with silicone is great. I can’t imagine trying to do it without it. A tip from me for installing the panel clips, get yourself a bolt ( about 3/8) about 6 inches long and drill a slight hole about 3/32 to one side on the end . Holding the clip with one end in place, place the other end of the clip in the bolt hole and push the clip into its place. This will save your fingers and it makes it so easy to install the clips.

  2. Sam (verified owner)

    Got some good weather in the middle of winter and got our HF 10 x 12 up. This kit was a tremendous time saver especially the caulking device. We sealed the panels in about 6 hrs (over two days}. The spacers worked great in preventing large “dimples” in the panels. This is the best 50.00 you will ever spend in putting up one of these green houses!!!!

  3. Oscar M Hagood (verified owner)

    Great product! Awesome upgrade to the harbor freight greenhouse! Very fast shipping and great christian company! Super fast response when we txt Frank about the product. Thanks

  4. Bruce Butcher (verified owner)

    The kit is worth the money. Watch the video and follow the directions. I have seen a lot of crazy stuff people are doing to retain the panels and this system is the best so far.

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