On 05/23/2016 04:06 PM, buckwheat wrote:
Have a small project I'm working on and need some advise. Pouring a small
concrete slab that I have formed on two sides, the side buts up to an
existing slab and the back is concrete blocks. I am in zone 5, do I need
expansion joints? if so what is best?

If the ground freezes in your area, you'll have frost heave to consider.