1 - rigid floor with a thickness of B ≥ 150 mm and density ≥ 1700 kg / m3
2 - mineral wool with a density of not less than 120 kg / m3
3 - fireproof paste Flame Cabel A Paste, thickness t1 ≥ 0.6 mm, t2 ≥ 1.2 mm
4 - rigid wall, thickness B ≥ 150 mm and density ≥ 600 kg / m3
The symbol indicates the side of the partition exposed to fire