Heated Greenhouse Tables

I shot some video today of the improvements we're making in the greenhouse. The main thing is replacing two of the existing table tops with heated slabs. Essentially we have heated cables running through a mixture of aggregate on top of the table. And the heat radiates from the aggregate up into the root zone of the plants in the trays on the table.

We had to totally tear down the table and build a foundation and wooden grid to support the weight of the new mass.