The slab was supposed to be 6" thick, but after the blue board insulation and radiant floor heat tubing, and I'm afraid it is more like 3" of actual concrete and wire mesh. I'm inclined to take Boo1's advice. Per recommendation from jheidt2543, it looks like blue board is 25 psi, and...
I'm considering making a rock/cement stairway instead of typical wooden stairs in order to add interior mass to our house, but am concerned that the slab won't support it, since we put rigid foam and radiant heat tubing under it. The staircase would rise 10 feet at it's highest point. Any...
