Alright

[spudd]

Hey Steve not sure how thick your floor is but we set up a friend of mines shop and he has infloor heat.we put in a Cnc,huge metal break and a lath all on 2x6 oak planks with rubber mats underneath with no problem to the heat coils
The place he bought them from had the same infloor heat and they were told that the weight distribution would not be a issue if he set it up this way
It has been about 3 years now and everything seem to be fine
Not sure how thick your flood is but his is 3 to 4 inches