There are pictures on this site of the 6X8 hfgh's joined end to end, but it does seem like there are even more construction issues with the 10X12's than with the 6X8's (hard though that may be to believe!). It sounds like a good plan to me though, and at a great price. I think other 10X12 owners will chime in. My 6X8 is doing wonderfully at the moment. All the best, Jim

I'd leave them mostly separate, but sharing a wall. Why? Because it gives you the flexibility to have different environs such as tropical vs desert; or warm temperate and seedlings. It also allows better isolation of disease, and allows you to repair one and move the important plants to the other. If the entrance to one is inside the other you will lose a bit of floor space, but you'll be able to get the double doored one warm for the same energy input.

You might vent your inner one through the outer one using greenhouse ducting to try and heat exchange the air on the way out. Even better would be two concentric greenhouse ducts with cold air coming in through the middle and warm stale air going through the outside tubing.

Whether you make a long tube or a more square shape is up to you and your land.

Thanks Javan and Nathanhurst for your thoughts :-)

I have since found the 'connected' 6x8's thread and read it throughout... Lots of great pointers! I'm hoping they will be a little easier to build than some of the first 10x12 models... Apparently there have been a few improvements made with the newer ones... but time will tell :-)

Your idea as to constructing with a common wall has much merrit. We have at this point decided to combine them into one long 10x24' (for better sun exposure), placing them with the doors at opposite ends. Hopefully this will allow for a better airflow and easier access. The 'extra' parts saved from combining them will be used to construct a single center dividing wall with a small doorway allowing for a sepration if needed; ie different temp requirement, virus, damage repair etc.
The boxes are still unopened (but we're hoping to start construction real soon), and we are trying to decide the best foundation... 4x4's, 2x12's or concrete block etc. Still not sure which would be best and least expensive.

keep us posted - that way the next person will be in a better position.

oregongardengal
Did you get your 10X12 HFGH connected

Hi funnylady,
Yes, we did... The important word to note here is 'did' :-(
Not sure if you have heard of the horrible wind storm the NW had a few months back.... Well it hit here with a vengeance. Normal high wind speeds of 15-20 mph (and that is a wind storm! Usually it's abt 0-3 mph) was clocked up the street at 84mph.
Good new was.... Greenhouse frame still standing... other good news... I was able to locate all of the panels, even though several were abt 5-7 acres away behind our barn or some in the other direction out at the road ...
Basically all went together well, (except we had planned on changing the doors to hinged rather than sliders) and we didn't get around to screwing the panels down (although they were double clipped). Overall the GH fared winter well... rain, snow and ice were no problem... but those horrific winds, well that was another story...
We were without power for abt 3 days and friends had nineteen 100'+ Fir trees that came down (we were lucky, only branches everywhere) all our trees held their ground.
Not sure any greenhouse could have withstood that windstorm, but had we screwed the panels in as planned we might have had even less damage.... Ah well....
BTW panels were all fine... are installed and screwed in now... don't want to tempt fate, but think it just might withstand that huge storm this time....

Glad you got it finished. I think I'm going to try the same thing.