Options for insulating small greenhouses

[Rivka]

the deck is actually elevated by quite a bit, maybe 2 2.5 ft. it has lattice on it so im not sure what is under there, but that is a great idea and i will go pull some lattice and look tomorrow.
i was planning on lining my shelves with these large shallow pans i got (actually made for dog kennels) and plumb them for drainage, so that i can water and not have it drip down on the level below it, i am planning on the drain lines to go out between the slats and out onto the ground away from the foundation, so that was mainly to protect the decking and keep thing neater. so lining the deck, specially the underside would not be a concern for drainage and just might.

i guess it was silly of me to think that as long as i stopped convection currents from happening by sealing the top that i could slow cold air from the bottom enough. i will focus on sealing up, from underneath if i can.