3 that video above with the guy putting steel in the bags is my video.
Pouring concrete under existing wall.
A professional foundation crew will construct a one sided concrete form inside the old basement perimeter and pour a new concrete wall.
I would also pour concrete higher than the existing deck in order for you to slope the top of the pour i m order to shed water.
If you re not overly concerned about seams in your slab you can notch out sections of your floor under your walls and pour footing sections to support the wall partially then remove the rest of the wood floor and pour the rest of your slab use re bar extended past through the forms of your first footing sections so they can be tied into the main slab.
Once the truck has reached the end of a section spread the concrete out evenly and a touch higher than the form with a concrete placer rake.
1 i have been doing these walls for 30 years.
2 i have tested several types of bags.
In this video we take you through the basics of how to remove set up and pour a concrete room with in your own home.
Deck footings closer than 5 to an existing exterior house wall.
And if a wall is chipping or crumbling it s fair to say the bag was taken off way to early.
This may require jacking up the car port to accommodate.
4 i can disprove your theory that the concrete will not set up correct due to water ratios.
Footings under existing slab.