Burj Dubai tier roof spire illustration

The pinnacle is the circular "pipe" (tiers 27 to 30 - pinnacle 1 to 4) that sticks up above tier 26. It starts (in the plans) at section 20B and is hidden inside the structure untill the top of tier 24 where it will show 1/3 of the way around the structure. After the top of tier 25 it will show 2/3 of the way around. Below tier 27 it is not called the pinnacle.

The spire is from tier 22 to tier 26 - spire 1 to 5. Another full tier to be erected before the spire starts.

The roof(s) is(are) from tier 19 to tier 22 - roof 1 to 4. Tier 22 is both roof 4 and spire 1.

Here is 3 pages to help illustrate this.