SIA 181 (2006)

Specifications between two rooms:

minimum requirements new built: Di ≥ 52 dB, L‘ ≤ 53 dB
minimum requirements refurbishment: Di ≥ 50 dB, L‘ ≤ 55 dB

increased requirements new built: Di ≥ 55 dB, L’ ≤ 50 dB
increased requirements refurbishment: Di ≥ 53 dB, L‘ ≤ 52 dB

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