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there is a tutorial demonstrating HOW TO INSTALL DRYWALL ON A CEILING.

That guy is putting a screw into the ceiling.

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Is the white part pointed out by red arrow drywall? If yes, where is paper. That guy said want "drywall screw to be flush with the paper"

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Drywall is made of gypsum surrounded with paper. The paper is the front and back surface of the drywall.

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    So the screw is tightened so that the top of its head is flush with, or just slightly under, the surface of the drywall so that covering is easier.
    – Solar Mike
    Jan 29 '20 at 7:18
  • I'd describe it as 'barely below the surface of the paper". (If you slide a taping knife across the screw and it clicks, it needs to be deeper.) And if you go too deep, just put in another screw a couple of inches away. Feb 1 '20 at 20:36

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