Insulation on North wall and North top is 1 sheet per top or side of Dow foil foam. The joint is taped longitudinally with reflective 4 inch duct tape material.

Top is held in place with the bolts that are pre-positioned in the roof rafter tracks for hagning plants next spring. Sun-side panels are pre cut, sealed with duct tape and numbered to be taken off and put back on during sunny days.

Air leaks - anywhere you see outside light, you have an air leak. Use silicon seal to plug every one you can find. ALso check your base plate - if the wood is at all uneven, there may be a leak there unless a leak proff seal was put down before the HFGH was built on the base.

If you need more info or better photos, email me privately

newfvt@sover.net

You are in Portland - same relative zone as we are.
Steve

Here is a link that might be useful: attached HFGH pics with insulation