Usually bad taping. (or none ). Sometimes ,extreme heat in the room, but it would have to be over 95 -100 f all the time.
Avoid seams above doorways because the slamming of the door can cause this area to crack
You don't have to , buti f it makes you feel more secure go ahead, it won't hurt.
Drywall mud is the thick, goopy white stuff you use to fill the seams between boards.
when you hang drywall, you have to tape off the seams with paper tape and "mud", then "float" the mud smooth. the drywall float is a flat metal tool on a handle that you drag across the mud to smooth it out, like when you smooth out the icing on a cake
Smaller pieces of concrete tend to crack less.
No, it won't.
nope just fill the crack with thinset
Make sure every single piece of mud is well sanded and no seams are visible.
You don't put 'spackle' on at all. After taping the drywall seams you 'mud' them with drywall compound. -It is a totally different substance from 'spackle', which should be used only to fill small holes and irregularities in wall.
There are a few ways that you can repair a large drywall section. One way is to use a patching compound and apply it over the area that needs to be repaired. Another way is to use a drywall adhesive to attach a piece of drywall over the area that needs to be repaired. Cut a piece of drywall to fit the hole. Attach the drywall to the studs with drywall screws. Cover the seams with drywall tape. Cover the entire patch with joint compound. Let the joint compound dry. Sand the joint compound. Paint the patch. For getting the professional drywall patch repair service contact us.
The metal is part of a protective foil like tape placed around the corners and seams of drywall. The reason it shows through is most likely due to a poor finishing job or paint being worn off.
You need a level surface so you would want the joints to be done & dry. HOWEVER you really shouldn't put tile over drywall. Cement board, HardiBacker or green board, but never drywall.