I would think it would be about 1/8" or so thick (of hard fiberglass) - maybe up to 1/4" - plus the Ensolite, which is about 3/16" (but that will squish).
You might also have a wooden trim "frame" under the Ensolite, depending on how it is currently set up (like if there was a hatch there before). That could be any dimension, but I would expect it to be around 1/2" or so, if you have one.
Raya
|