I’d actually be surprised if it was insulated much at all by modern standards. It’s a mid century construction. My guess is the air gap between the insulation/s

I’d actually be surprised if it was insulated much at all by modern standards. It’s a mid century construction. My guess is the air gap between the insulation/siding and the masonry is carrying the heat up and out of the attic/roof. And yes the radiation on the exterior is quite noticeable. It’s being felt by a few bushes.