Drywall use should be avoided in the shower area if possible. Any are receiving a daily dose of constant wetting will be prone to moisture infiltration and deterioration. On ceilings that might only receive a smattering of water, any tape should be o.k., as long as the drywall is finished, primed and painted.
To be safe in this situation, I would NOT use any product containing gypsum. There are purpose made products that will do a MUCH better job for you. Durock is one, Dense-Shield is another and there are at least 2-3 more. - These are sheets made with concrete and fibre and are far more durable and water-resistant than any gypsum product. -Another advantage is that most of these come in 30x60 inch, so are handy for use in standard tub walls. All can be cut and snapped just like drywall. I have not used gypsum in tub or shower walls for over ten years.
Yes, mesh type drywall tape usually has adhesive on one side.
The fastest method for drywall taping is to use a type of fiberglass tape. While less efficient, it's easier to set in than paper tapes and other materials.
Either cut out a square to the center of each joist either side of the hole and replace the drywall with a new piece cut to size. then tape and mud the joints. Also there are metallic screen patches made for small holes that stick to the existing drywall, and can be mudded over to fix the hole.
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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.
Regular drywall primer.
It is better NOT to use any form of drywall/sheetrock for shower tile walls. -Pros have been using concrete fibre board for years. Cost is only a little more, labour is the same and board is 30 x 60 in most cases, reducing wastage. -Only amateurs use drywall in bathrooms any more.
zip type bags, shower cap, anything plastic that will cover your hands...tape it to your arm !!
Depending on the weight and form of the granite, PL200 may work. If not that then more expensive glues like PL Premium would definitely work
"Drywall primer" -Yes, -it's called exactly that -right on the can !
There is not normally any kind of adhesive on drywall, but this could be something very new that i haven't seen.
There are drywall products on the market that have a chemically treated paper to reduce and prevent the growth of mold. Also, there is moisture resistant type of drywall available.