8k page size tablespace without 8k page size temp tablespace

Hi All,
our database has one 8k page size user tablespace but ex-DBA has not created 8k page size temporary tablespace.

my question is if tables into 8k tablespace need to be sorted or ... and use temp tablespace, are they use 4k default temp tablespace ? what db2 does in this case ?

Thank you in advance for your help