[buffalobillpatrick]

DEnd I see that u r in NC

Way different from cold Rocky Mountain climate zones 5-7 with 6-9 month heating seasons.

Here, Radiant heated floors are the most comfortable, along with low gas bills, (no A/C and ducts required)

On my Neighbors big log home, (low average R-value with much infiltration) the floors had to run 85*F when it was cold & windy outside, feet were warm, but the Propane bills were high.

Scorched air heat sucks, dry air, dust bunnies, hot air rises up to ceiling creating a higher heat loss, while feet stay cold.

U r right PVC with large pieces of tile would not work, but small flat stones in a bed of silicone should, maybe