Drywall Mudding Issue

snookums2May 14, 2013

Here is a picture of a ceiling that was installed, trying to show where you can see raised areas of mud over the screws. I suspect an air bubble beneath next to the screw. When I messed with one with a scraper it popped out.

How should I handle these? Just sand them smooth or pop them out and refill?

I had to increase the photo contrast as it was washed out.

Where mud was popped out. The screw looks flush but it is recessed.

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brickeyee

Dimple missing?

One of the things the dimple around the screws head does is create enough thickness for the mud to be thick enough to stay in place.

    Bookmark   May 14, 2013 at 1:45PM
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snookums2

I'll check the thickness of what pops out. The screw is recessed behind the mud.

If I were to tighten the screw to make it deeper, it would undoubtedly break the paper. This is on a ceiling.

    Bookmark   May 14, 2013 at 2:19PM
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brickeyee

There should be a round dimple around each screw head from the driver used to set the screws.

    Bookmark   May 14, 2013 at 3:39PM
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HandyMac

If the bump sands smooth, do that.

People do not always use dimplers or drywall screwguns which automatically make the dimple. That means the screwhead is flush or near flush with the drywall surface. Those screws will need to be sunk in more to fill and sand properly.

    Bookmark   May 14, 2013 at 9:12PM
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snookums2

Thanks.

I sanded them today. No, I don't think he used a drywall gun. Some of them had very little mud over top and there is a slightly raised ridge of the wall board around the screw, not a dimple. 40 years in the drywall biz, but no surprise. His work was an awful mess and half baked.

I guess I'll have to build up some mud on those that have a ridge.

    Bookmark   May 14, 2013 at 10:15PM
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brickeyee

"Those screws will need to be sunk in more to fill and sand properly."

And by tearing the facing layer result in significantly weaker attachment of the drywall to the framing.

The dimple crushes the core slightly but allows the facing to remain intact.

.

    Bookmark   May 15, 2013 at 9:28AM
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