Ive been going back and forth on if a monolithic pour is the best choice for my garage foundation. It will be a 40x60x12 stick built garage with 2x6 walls. My question is is a mono pour a good direction to go with garage foundation? I live in southern Illinois and I’m not 100% sure the depth it needs to be? I will be starting this garage his year so I need to gets some opinions. Please don’t hold back. If a mono pour is a good idea then maybe I could get some dos and don’t a with forming and pouring. I will be having a professional finish the pad. Also I’m considering radiant heated floor so any opinions again would be apppriciated.
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Monolithic foundation
- Thread starter Jared1982
- Start date
Ive been going back and forth on if a monolithic pour is the best choice for my garage foundation. It will be a 40x60x12 stick built garage with 2x6 walls. My question is is a mono pour a good direction to go with garage foundation? I live in southern Illinois and I’m not 100% sure the depth it needs to be? I will be starting this garage his year so I need to gets some opinions. Please don’t hold back. If a mono pour is a good idea then maybe I could get some dos and don’t a with forming and pouring. I will be having a professional finish the pad. Also I’m considering radiant heated floor so any opinions again would be apppriciated.
Biggest issues are what type of soil is below and will it be suspect to frost heave. That will answer the big question. If not connected to any other structure, it should move up and down uniformly. Can be an issue at doors, etc.
ConCretin
Well-known member
A monolithic slab is a great option for a detached structure. You can let it 'float' on the frost or use rigid insulation to protect it from frost movement. I'd recommend adding a concrete or masonry curb at the perimeter to get your wood framing up a bit from the surrounding grade. Even with a curb it should be significantly less expensive than frost walls.
Firebrick43
Well-known member
I would say no for a building that size. To much going on. Break it up into seperate pours.
ard
Well-known member
Id do a nice stem wall. Then when you are ready for the slab, insulate as needed, set the radiant and pour the final slab.
matt_i
Well-known member
I would look into Frost Protected Shallow Foundation. The US Government HUD has a multi page .pdf that describes the design process very well.
Boiling down to my take is that you place rigid foam on the soil and pour the foundation, floor, and everything on that. It takes a little creative forming to get the foundation to come out correctly due to the "wings" but it disturbs a lot less earth and you'll have a stable and well insulated foundation.
Boiling down to my take is that you place rigid foam on the soil and pour the foundation, floor, and everything on that. It takes a little creative forming to get the foundation to come out correctly due to the "wings" but it disturbs a lot less earth and you'll have a stable and well insulated foundation.