How to Backfill a patio?

You can backfill with dirt. Most videos show it going directly on the ground. Just make sure it's packed down. If you want to use stone I would say use pea gravel which are very small.

Here are some videos

https://www.youtube.com/watch?v=RlopZcqyymc

https://www.youtube.com/watch?v=r-Am9K-yDOM

https://www.youtube.com/watch?v=ds1cPS4z9cA

https://www.youtube.com/watch?v=8FZdcNS3A7Y

https://www.youtube.com/watch?v=GsQ6k3L-7mI

Hi Isaac, I researched about what you plan to use to fill the form and aea you've created. It seems you'd want a very well-packed base and as William said, pea gravel might make the best base right beneath your concete. For those who don't know what the Walk Patchmate is, here's a link below. Interesting to me..... :)

https://www.google.com/search?q=how+to+prepare+for+walk+Maker+Pathmate&rlz=1C1CHZL_enUS709US709&oq=how+to+prepare+for+walk+Maker+Pathmate&aqs=chrome..69i57.13347j0j7&sourceid=chrome&ie=UTF-8#kpvalbx=_EzJ-YPD-E8yw0PEPhei8kA816

Pack first with small gravel, #7 - #10 should get it. Pack it well then add the dirt. Make sure it is clean dirt without any weeds in it. Again, packing well.

I found this helpful video which shows dirt: https://www.youtube.com/watch?v=rPeZDI9Yvro

I called my local stone place. They sell recycled Concrete. Is that the same and can it be used on this project?

Hi Isaac, it's best to use sand/dirt and pea-sized gravel so you can compact the backfill before adding the concrete.

Thanks. I will be using QP, as I read that is best for base patio with cement.

There are some vids on You Tube. You need a gravel mix under layer. Do you have a “slight” slope to your patio to help with water runoff? Ponding on concrete, especially in winter, will lessen concrete’s life.