Absolutely. I really like the way you think and all the helpful info you have given on the site. Insulation is the least expensive thing with the fastest reward. In home construction I could choke the insulators. I regularly add or improve the insulation work done by so called professionals. 2 days ago I we had a major cold snap. 3°. With a -20° wind chill. Reason for the cold room temps. A few weeks ago I repainted my daughters bedroom. The paint in the corners took 10 hours to dry so during the cold I ran my ir temp gun. The walls were 72° and the corner was 58°. Thanks to another piss poor job.
In my grow room the floor is 3/4 plywood. No real way to insulate the joists so I added 2” of ridged foam. On top I nailed down another layer of 3/4 plywood and then tiled it. The walls are fiber wool which is much better than fiberglass with the paper backing. In the tents outside the grow room I cover the tops with drop cloths. You can feel major heat between them and the tents walls. Below the tents I lay down 2” foam and even shim the back side so the tent has a slight pitch. This helps with sucking up any run off.
That's what I'm gonna try too.
