[RoninLB]

[QUOTE=tcar;4897176]

You have a boiler in the garage? Assume hydronic?
------- seperate boiler for the antifreeze and hot water for the slop sink

Why not space heaters? Lot less expensive.
[b]------ I've been to too many electric fires caused by them and I'm spooked about the gas ones. The CO meter takes a memory from any low meter fumes and it becomes the new ground zero. It's one large room garage, 25' x 33' so it's not like I can mount the CO meter in another room like it's supposed to. Many people leave it in the boiler room which is a no no.

What's the goal here, keep it above freezing in the garage all winter or just warm it up when you work in the garage?
-------- Maintain 55F all winter and warm it up when necessary.

For the latter, space heaters as it will take hours and $$$ for the slab to heat and warm the garage.
-------- My bud lives up state NY downwind of "Lake Effects" winters. He has snow on the ground 7 months a year. He leaves his radiant heat on in his detached huge garage and cost is minimal at 55F. Although I see your point.

Why 6" slab? Heavy trucks in garage? Maybe you feel that you need the mass to keep it warm?
-------- No heavy trucks and the mass for heat is a non issue. Actually the mass is in my head. It's pretty thick when I'm into overkill. Actually this is my last hurrah at my age.

Mesh should be in the lower 1/3 of the slab, not in the middle or upper, regardless of where the tubes are.
------ Seems the routine is to attach the tubes to the mesh. It has to be attached to something.


The mesh is to help with tensile stresses, which are the bottom half of the slab.
Yep. The issue is tube placement for a good system. I read the above sites I posted and if tube placement isn't correct issues arrise. I hope the 1" cuts and all cuts in a square will prevent cracks.


thx for response