I wouldn't use glass fibre sheets they might be too rigid long-term.
All the manufacturers do the jointing tape though so shop around a lot. Some do big square sheets of the stuff that you can cut it up if you can find some. Works out a bit cheaper if I remember rightly.
All the manufacturers do the jointing tape though so shop around a lot. Some do big square sheets of the stuff that you can cut it up if you can find some. Works out a bit cheaper if I remember rightly.