Drywall

I use about five pounds per 10 -12 sheets.

You will need approximately 10 rolls of 500' long joint tape.

Yes, definitely. You have to sand and then fill at least twice in most cases.

My personal preference is mesh tape, I can always get a better finish with it.

No, pumice has nothing to do with drywall.

The cost for a sheetrocker to remove wet drywall typically ranges from $1 to $3 per square foot, depending on factors such as location, the extent of damage, and the complexity of the job. Additional charges may apply for disposal of the wet drywall and any necessary repairs to framing or insulation. It's always best to get multiple quotes from contractors for a more accurate estimate.

it's too difficult to explain on a site like this - ask a local builder for estimates.

If you mean 50 degrees 'f' of temperature, NO I've seen it installed in much colder conditions than that.

Drywall was invented around 1900 in New York.

You use a regular wall tile adhesive like Ecobond

1/2 inch is the standard.

If the face of your tongue and groove is smooth then you don't need drywall. I have one whole room covered in T&G cedar and it looks great.

Is that 5.5 feet x 6.5 feet. (you may want to express your sizes more simply) If so, it will take 6 sheets if the room is 8 feet high.

If the drywall is directly onto the concrete, drill into the concrete and use a shield and screw or there is a concrete screw called Tapcon that screws directly into the concrete without a shield and holds much better. If the drywall is on furring strips, either mount the banister on the strips or go through the strips into the concrete.

Partly the extra thickness, and partly a chemical they put in the mixture.

No, that is futile. The insulation goes inside the wall.

Mildew proof drywall is best out of drywall choices, -but much better still is concrete/fibre board. These are now plentiful and low cost, totally impervious to water and great for tile. Last time I was in Home Depot they had 3 kinds. I always these around bathtubs or shower areas.

lightly wipe the drywall mud after it drys

Might be an idea to tell us the SIZE of the basement to start with.

12 -4x8 sheets

If you have wood studs I know of no code restrictions. I think sheet rock screws make good wood screws for many different applications.

If you have metal studs, the screws won't hold the box solidly to the stud. This may be a violation; I didn't look it up; but many things are done in a pinch. If this is your situation, connect the box to the stud as best you can. Then, once sheet rock is added and your device and faceplate, there won't be a problem because it all goes together to make an adequate installation.

I am NOT saying the box can be free-floating. It should be held more or less in place with the screws. If it is free-floating then you are depending on the faceplate to hold the box and device in place. This is a violation of code.

There is paper tape and fibre mesh tape.

Drywall as we know it has been around since about 1890.

Preferably you cut and fit a patch of drywall. I always do that for holes and gaps over 1/2 inch.

The weight of one sheet of drywall 12'x2'x1" (feet) would typically be around 53-57 pounds, depending on the specific type and thickness of the drywall.