Putting Up Sheetrock
I am in the process of purchasing a house and one of the things I am looking at doing is having a firewall installed in the garage. The wall a framing are there, just not the sheetrock. I have had two estimates: one was outrageous and the other was stated this way "sheetrock with 5/8" fire rated Type x and one coat joint compounding, no sanding. Include heat temp."
Now - it has been awhile since I've seen anyone put up sheetrock, but I remember that the joint compounding was allowed to dry, sanded, then a second layer was applied and sanded.
My question is how important is the sanding and second layer? Are these steps for priming walls that are to be painted?