1. Available space were chairs are going to be installed.
- Aisle to aisle.
- Aisle to wall.
- Step to step.
- Step to wall.
All dimensions should be taken on the floor.
2. Treads’ width.
3. Risers’ height.
4. Floor slope.
Place a leveling tool horizontally, record its lenght (L) and measure the drop (H) against the ramp floor.
5. Location within the room of the break lines where the floor changes inclination.
6. Chord and arrow of the arc taken as base to draw all other rows (usually of the first row).
- C = Length of chord (from start to end of curve).
- C/2 = Half of chord.
- F = Arrow length.
7. Very if arcs of all platforms are concentric.
Measuring at center and at both ends of arc treads, these must be equal or similar.
8. Position of any element that could interfere with installation of chairs.
Position of any element that could interfere with installation of chairs, either at floor (electric boxes, air vent, Tivoli, etc.) or on walls (output columns, speakers, etc.).
9. For irregular shape rooms split it to triangular sub-shapes.
All the auxiliary measures resulting from sub-dividing into triangles the polygon area of the auditorium envelope, in the case of rooms that are not rectangular.
10. Anotate floor material.
Finishing of the floor (ceramic tile, porcelain, marble, vinyl, laminate floor, wood parquet, or carpet), and the base on which that finish was placed (concrete, wood, prefabricated concrete, steel sheet, etc.). To be able to consider what type of anchor is suitable.
11. Aisles and steps width.
12. Room total width.
13. Room total length.
14. Screen height.
15. Stage height.
16. Floor to ceiling height.
17 . Length and height of secondary walls.
18. Carpet boundary’s longitudinal location.
Longitudinal location within the room of carpet boundaries (front, middle and back).
19. Keep measurement tape or lasser beam horizontal.
Keep the tape or laser beam horizontal for all length and width measurements.
20. On ramp register ramp slope.
For measurements done on a ramp we have to register the ramp slope. Or register the elevation difference between point to point of the taken dimension.