The 6x8 Harbor Freight greenhouse kit can be a real bargain but owners on this and other gardening forums have encountered many problems as well. Among the major drawbacks are:
1) Premature panel failure potentially related to minimal UV protection.
2) Lack of headroom (the door is only 5'4" tall).
3) Thin aluminum components make for flimsy structural support.
4) The sliding door design jambs and comes off the mounting mechanism.
Here are some suggested alternatives I used in the construction of my 6x8 to address these shortcomings.
1) All polycarbonate panels are covered with high quality, 6 mil, UV resistant film.
2) "Raised the roof" nearly a foot by constructing the unit on 2x12 lumber set on edge.
3) Designed my bench and shelf structure so this doubles as solid support for the weak aluminum framework.
4) Hung the door on hinges rather that using the slide design.
I estimate these upgrades cost about $80-$90 over the normal cost of building the 6x8 unit.
Good job looks great! My only suggestion is put two 50 gallon water barrels one on each corner and set your shelves on them for the support. The water will make a big difference in cooling and heating the structure while maintaining smaller temp swings! the water will extend you seed starting season by weeks and also you fall season by weeks or longer .
Nicely done. I put up one of those greenhouses in October 2012. No problems with the panels or structural integrity... yet. Mine is somewhat shelted and I live in a relatively mild climate so we'll see how it goes over time. It does cause me concern if I bump one of the tables inside and the structure jiggles a bit.
So far so good on the door, mine seems to work ok especially since my wife showed me a trick where you do most to push to open with you foot in the lower right hand side corner.
The height is a different story and I much admire your work there. A thought of something like what you have done came to mind about the 3rd time I sizzled some hair on the top of my head when it brushed the light I have mounted on the center beam inside.
So far so good on the door, mine seems to work ok especially since my wife showed me a trick where you do most to push to open with you foot in the lower right hand side corner.
The height is a different story and I much admire your work there. A thought of something like what you have done came to mind about the 3rd time I sizzled some hair on the top of my head when it brushed the light I have mounted on the center beam inside.
Sounds like the time I torched my cap while grinding some metal. Burned a hole the size of a golf ball before I realized I was on fire. Sometimes, given my stupidity, I marvel that I am still alive and have all my fingers and toes.Wack wrote: ...A thought of something like what you have done came to mind about the 3rd time I sizzled some hair on the top of my head when it brushed the light I have mounted on the center beam inside.
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Hi Dewey,
I wanted to thank you for your instructions that I found on how you fixed the Harbor Freight Greenhouse. I have extremely high winds so needed to make certain my GH didn't fly away. I used the 2 x 12's like you did and also created a bench frame with 2 x 4s that were also affixed to the frame. It seems really sturdy. Tomorrow is the final day to put in the remaining panels and I am done! I haven't changed out the door but I think next year I may do what you did and put it on hinges but for now I wanted to get it done before the weather changes. Tomorrow afternoon winter will be here with a storm so I just got in under the wire.
Thanks so much for the great info.
Karen
I wanted to thank you for your instructions that I found on how you fixed the Harbor Freight Greenhouse. I have extremely high winds so needed to make certain my GH didn't fly away. I used the 2 x 12's like you did and also created a bench frame with 2 x 4s that were also affixed to the frame. It seems really sturdy. Tomorrow is the final day to put in the remaining panels and I am done! I haven't changed out the door but I think next year I may do what you did and put it on hinges but for now I wanted to get it done before the weather changes. Tomorrow afternoon winter will be here with a storm so I just got in under the wire.
Thanks so much for the great info.
Karen
I may try that in my new one, thanks for the idea.Bobberman wrote:Good job looks great! My only suggestion is put two 50 gallon water barrels one on each corner and set your shelves on them for the support. The water will make a big difference in cooling and heating the structure while maintaining smaller temp swings! the water will extend you seed starting season by weeks and also you fall season by weeks or longer .