I continued adding rows of blocks, overlapping each row to the inside of the igloo, and packing snow to hold them in place. I also packed snow into all of the cracks and crevices on the outside of the igloo. When it came time to close up the roof entirely, I first made about 15 blocks and stockpiled them inside the igloo so I would not have to crawl through the entrance one block at a time. Before closing up the Igloo roof I had to construct the roof of the entrance to support the front side wall of the Igloo. I continued building upwards until it was time to install the final 2 roof cap blocks to seal the whole thing up. Unfortunately I did not take a picture just before the final blocks were added..