We are going to be starting drywall hanging in 2 weeks, which is the final part of my GC's contract. We are separately hiring another contractor for mudding and painting. My GC has informed me that he intends to use all 4x8 drywall panels to save cost and reduce the weight of the boards. Since he's not doing the mudding, the creation of extra butt joints isn't his problem. He's telling me the cost of a change order to "upgrade" to 4x12 sheets of drywall is $5K.
My mudding contractor is saying he won't charge extra for the extra butt joints introduced by using 4x8s, but he is saying that the final product simply won't be as smooth.
Do you think it's worth it to pay the extra $5K (or maybe we can negotiate down) to get the 4x12s? How noticeable will the extra seams be? Should we be worried about cracks or other major issues caused by using 4x8s?
Our drywall is primarily 1/2", with some areas 5/8" for fireproofing or sound proofing.