What is the difference between T15 and T24 grid systems?

The difference lies in the width of the profiles: T15 is narrower (15 mm) and looks sleeker, while T24 is wider (24 mm) and is more commonly used for standard applications.

Usually, L24 edge profiles are used with T24 ceiling profiles, and L19 profiles with T15 ceilings.

If you are unsure which edge profile to choose, go for the L19 profile, which has a standard 24mm side and a 19mm side, giving you the option to decide.