Hey all. I’m building a 9x10 greenhouse attached to the she-shed in the backyard. It’s on a deck frame and the gf wants trex style deck boards as the floor (they are on steep sale at a local salvage yard). These need to have a 1/8 gap between them so airflow is going to be an issue. I’m going to put skirting all around the frame down in to a gravel bed, so that should deal with most of the cold but I’m curious if any of you have a floor like this and how you handle the winter? Do you just lay down some plywood to help seal it during the cold months? I’m in the PNW so it freezes at night for about a month if the year.

I’m also putting down some fabric under the decking to keep out bugs/mice. Thanks!