Insulation and sheetrock are related only in the sense that they are used in walls. When one side is drywalled insulation batts can be stuffed in the other side and then boarded up.
No, that is futile. The insulation goes inside the wall.
You can put r11 insulation inbetween the studs before sheetrock. After that, not much you can do. Get a solid core door.
Insulation should only be stapled on the edge of the stud. That's what the flap on the edges is for. This creates a vapor barrier and if you compress the insulation enough to staple on the sides this reduces the insulation at that point. Insulation has to be fluffed to get the benefit. It is easier, quicker and does not interfere with the sheetrock in any way.
Rigid insulation by DOW makes many different types of insulation, most have a foil side which should be glued to the concrete while the colored side with logos on it will face out ready for walls to be framed and sheetrock to be hung.
Sheetrock, drywall or gypsum are insulators.
should you install sheetrock horizontal or vertical
Yes, sheetrock is fire resistant.
No it will actually ruin your Sheetrock or Drywall
yes
No, you may think you can, but the paper will just come off the sheetrock.
yes if you have framed unfinished walls, measure then deduct finish such as sheetrock
You cannot use sheetrock as flooring, period. If you meant on a wall, there is no reason you cannot put sheetrock over tiles. The question is why would you want to! Why not remove tiles and material behind, which is probably sheetrock, and then install new sheetrock. If it is an area prone to moisture you could use moisture resistant sheetrock. The job would look better and you would not lose the space by adding over existing material.