Concrete pad for shed

[tom91]

I'm laying a concrete pad for a garden shed. Some of the sides of the pad are going to but up to existing brick/stone walls. I gather I cannot simply use the walls as formers and pour concrete straight up to them.
I guess I need to attach wooden boards to the walls, and pour the concrete up to them? Should the boards be removed when the concrete has set?
Thanks for any advice

 

[Woodster66]

Ideally yes, or else the wood forms will rot over the years and his will cause a void where they have been placed, I would leave a small gap to get the boards out and then fill that gap with concrete to the correct level while the concrete is still green.

 

[Deluks]

You could just use a couple of layers of heavy polythene at a stretch. Or a 25mm sheet of polystyrene, which can stay put.