Can you recommend what to use under heatmat in GH for insulation?
I currently have a couple of 48" X 20" heat mats that I want to use in my Solexx greenhouse to keep the roots warm of my citrus trees during these extreme cold nights we have been having here in NJ.
I want to use something under the mats to help retain the heat. But I want to use something that is heat/fire resistant in some way.
I was originally thinking of Tekfoil that you can get from Farmtek/Growersupply but was hoping to be able to get something similar from a Home Depot or similar store.
If you have any suggestions, please let me know. Thank you! Christy