You just couldn't wait to sow those seeds - amateur!

Sounds exactly like you know what you are doing. I ran the water from the house on an incline and wrapped the piping with pipe heating cables wrapped in foam insulation. When the temp gets to -10 or therabouts I either have to turn the water off in the house and bleed the line or take a hair-dryer to it.

I too caulked every joint (I assume you did). You never mentioned what size model you got, but I assume you got the larger one, the 10 x 12. Here with this 6 x 8 model, I don't mess with any of the pool covering stuff or bubble insulation, or any of that but it would likely benefit your purpose. Without shade cloth I'd be killing my grafts. The cooler the winter, the less sunny, the easier it is for me to keep this thing on the cool side. I prefer constant temps in the 55 degree range, however, on a really sunny day, I can expect 75F with all bells and whistles.

The thermal mass. perfect...

Don't know anything about septic line depth. Sounds like you better ask someone.

Good work! You're a pro.

Dax

I have been patiently planning for the construction of our 10x12 HFGH and in doing so have read and researched many of your concerns. The utility question is a tough one. A committment to underground water is long term. The heating cost is a big question in my mind. I am planning to bury our lines at about 30", my thought is if I'm renting the ditch witch I might as well put the line in at the safest depth.(we live in south central PA, zone 5). I am designing the water system so that is can be drained at seasons end. This might change but at least for now if there is no heat I have options. Here is a link to a very well designed water supply system to use as a starting point.
http://www.taunton.com/finegardening/pages/g00045.asp
Here is another link to a more easily installed system that may be useful as well.
http://www.homeenvy.com/db/8/648.html
There is a few nice water supply pieces at http://www.leevalley.com/garden/page.aspx?c=2&cat=2,2280&p=33160
I do have concerns about the natural gas line and hookups but that is further down the road, I'll lay the line and figure that one out when the time comes. I'd like to see pics of your GH construction as I am starting ours this coming weekend. Hope this helps.
Good Luck!

well i just finished for the day erecting my 6X8 HFGH. My only issue was the dimensions I worked off were short on the door end. I need another 1 1/2 ". I took their measurments but anyway all that I have left is the panels.
I looked for more bolts at Lowes but didn't find anything that worked unless a 1/4 hex would work.

I tried 1/4 hex heads but they where too wide at the head to slide in the channel. A few seconds on each side on the bench grinder and they worked well. I only needed six. I would try Fastenall or a nuts and bolts type place if I needed several.

well my HFGH is up so now I have to decide my layout and what all I plan to do inside. I know I will be ordering a shade cloth. The temp outside was 62 and the inside was 88 and I know I the greenhouse is not completely sealed yet.

I will say............ I am excited