1st: Another outstanding video.
A: We never adjusted the aspect ratio for the film grain. Kent made a point of this in the past. So, drop 4096/1716 in that texture node.
B: Viewers might want to apply the updated concrete material to the rafters as well. The rougher rafters work in the scene. But if you do update the material, remember to delete the brick-related nodes like we did before.
Eric