Pulling up sagging drywall with fender washers.

This is a follow up to my request for help in the following thread,
http://groups.google.com/group/alt.home.repair/browse_frm/thread/c2ac8063fe0f008c/7a09f3a48f4a6019?tvc=1&q=Andyeverett57#7a09f3a48f4a6019
The sagging drywall in smallest second floor room with little furniture was pulled up with about 100 fender washers in the following way.
Roughly uniformly spaced 1 1/2 inch fender washers, held in place with 2 and 1 5/8 drywall screws were screwed in to the point of just touching the drywall. With drywall supported each screw was tightened, working around to all the screws. This process was repeated. As the 2 inch screws drove into too much wood they had to be replaced with shorter screws. Total time to clear out room, lay drop clothes, and screwup was about three hours. Would have goon faster the next room. I stopped work at this point.
If the 2x6's could hold another layer of drywall, in addition to the blown in insulation this might have been a good time for the addition of 1x lath and another layer of drywall. Or if it was my house I might have nailed the shit out of the ceiling and spackled it and lived with the consequences.
The costumer is having a contractor try and pullup the ceilings, I could not take the job right away.
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andyeverett wrote:

http://groups.google.com/group/alt.home.repair/browse_frm/thread/c2ac8063fe0f008c/7a09f3a48f4a6019?tvc=1&q=Andyeverett57#7a09f3a48f4a6019

If what you did is holding, I guess you would then have to figure out how to put joint compound over the 100 fender washers.
But, if what you did seemed to work, it appears that it means the existing drywall could be moved up flush against the ceiling joists without the problem of insulation or debris getting caught in between the drywall and the ceiling joists. If that's the case, then probably the other idea of jacking up the drywall with boards first and then just using drywall screws to secure it would be easier, faster, and less expensive. Maybe the other contractor will try that.
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