6Step 6: Rebar and pouring the roof
18 half inch rebars on 8 inch centers. Strong enough! Next, add a perimeter to the form and pour concrete. About 4,000 pounds worth. I expected at least a little deformation of my form, for all that weight was being borne by my 5 arches, but there was none! Impressive.
Not taking any chances, I did not enter the cellar until I was confident the concrete was fully cured.
Removing the form from inside was not difficult, for it was designed for easy disassembly and re-use.
A view of the top before the entrance was completed and the cellar covered with 2 feet of earth. The wood at the rear is covering the ends of the rebar to prevent injury. They will be part of the reinforcement for the entrance-way.
I poured the roof in 3 sections, for that is the most concrete I can handle working alone. The seams are nearly invisible from below, and are waterproof. It was not difficult creating the arch in the top using standard concrete. The radius of the top arch is about 6 inches larger than below.
The arched ceiling is as glossy as a counter top, thanks to the plastic sheet I laid over the plywood. See light reflecting off ceiling in picture below.
