Impact sound reduction (IS)
The noise of footsteps transmitted to the room below is known as impact sound. In combination with the subflooring, underlays with a high IS value (impact sound reduction) can significantly reduce impact sound.

Minimum requirement / Elevated requirements

	EPLF	MMFA
IS	≥ 14 dB / ≥ 18 dB	≥ 10 dB / ≥ 18 dB

Reflected walking sound reduction (RWS)
Walking noise heard in the same room is known as reflected walking sound. Suitable underlays can noticeably reduce reflected walking sound. The test standard for determining so-called RWS values is still in development, so no generally accepted test method is available yet. Once the new test standard is issued, specific recommendations for minimum requirements can be given. Nevertheless, today it can be said that the higher the RWS value (reflected walking sound reduction), the better.

Minimum requirement / Elevated requirements

	EPLF	MMFA
CS	≥ 10 kPa / ≥ 60 kPa	≥ 200 kPa / ≥ 400 kPa

Minimum requirement

	EPLF	MMFA
PC	≥ 0,5 mm	≥ 0,5 mm

Minimum requirement

	EPLF	MMFA
SD	≥ 75 m	≥ 75 m

Maximum allowed R value of the total floor system

	EPLF	MMFA
Heated floors R	≤ 0,15 m² K/ W	≤ 0,15 m² K/ W
Cooled floors R	≤ 0,10 m² K/ W	≤ 0,10 m² K/ W