and you don't want to lay those jute backed mats directly on the bare [or painted] metal floors, condensation from the temp difference of the metal-to-interior gets trapped in the jute and is why there's so much rot in these old floors
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics