Hi
We have a 300mm at the side of our house that was considering concreting either up to or close to the colorbond fence.
Haven’t much experience in this but willing to give it a crack and see if it works or not but would appreciate any times on simple to mix concrete or what to use and how to set out the form in the narrow gap

may be hard to see in the photo as still have fake grass on top but have dug out the channel - was originally laid with bricks and thin concrete that kept cracking. It’s an or two deep and runs from the front of the house to the back along the fence .annoyingly the existing slab also curves at the end to
thanks
kev