DIN 4109 (2016)
Recommendation for single-family homes:
normal soundproofing: R‘w ≥ 50 dB, L‘n,w ≤ 56 dB (1)
increased soundproofing: R‘w ≥ 55 dB, L‘n,w ≤ 46 dB (1)
Requirements separating floor of a multi-family home:
normal soundproofing: R‘w ≥ 54 dB, L‘n,w ≤ 50 dB (2)
increased soundproofing: R‘w ≥ 55 dB, L‘n,w ≤ 46 dB (1)
(1) softly resilient flooring can be credited
(2) softly resilient flooring can not be credited