I am wanting to build a fire pit. Have been thinking of using 8" concrete blocks for the retaining walls. I know that by themselves they will crack after a period of time. However I was thinking of filling them with concrete to make them less apt to crack. Would probably use the pit 4 or 5 times a year. Would prefer not to have to buy fire brick due to cost. This will be a rectangular pit about 5'x 3'.
Thoughts?
Thoughts?