ISO 12354-2 Calculation Model for Impact Sound Insulation – PRISMI MGE
ISO 12354-2 Calculation Model for Impact Sound Insulation – PRISMI MGE
This article presents a predictive calculation model based on UNI EN ISO 12354-2 to estimate the in-situ impact sound level L’n,w in residential buildings using certified PRISMI MGE recycled rubber acoustic underlays.
The model uses certified dynamic stiffness (s’) data to simulate the improvement of L’n,w for the entire floor build-up based on the mass–spring system of a floating floor.
Objective: to predict in advance the achievable L’n,w with MGE 3, 4, 5, 6, 8, 10 mm.
What is the ISO 12354-2 impact noise calculation model
The predictive calculation is performed using a simplified model compliant with UNI EN ISO 12354-2, considering the mass–spring behavior of floating floors and applying correction factors for lateral transmissions (+1 dB) and workmanship tolerances (+1 dB).
The mass–spring principle of floating floors
The slab and screed act as masses, while the MGE underlay works as the elastic spring that reduces vibration transmission.
Reference floor data
Reinforced concrete slab 20+5 cm
Structural mass: 300 kg/m²
Bonded screed mass: 72 kg/m²
Total bare slab mass: 372 kg/m²
Ln,0,w of bare slab: 78 dB (ISO 717-2)
The PRISMI MGE acoustic underlay
What is PRISMI MGE
PRISMI MGE is a recycled rubber acoustic underlay in rolls for impact sound insulation under floating screeds.
Available roll widths: 100 cm, 125 cm and – on request – 150 cm
Available versions
MGE 3 mm
MGE 4 mm
MGE 5 mm
MGE 6 mm
MGE 8 mm
MGE 10 mm
Certified dynamic stiffness s’
Tested according to EN 29052-1:1993 – Accredited reports: 436930 · 395711 · 436931 · 436932 · 436933 · 436929
Performance Table MGE 3–10 mm
Thickness | s’ (MN/m³) | L’n,w in situ (dB) |
MGE 3 mm | 58.0 | 61.5 |
MGE 4 mm | 49.0 | 60.4 |
MGE 5 mm | 45.0 | 59.9 |
MGE 6 mm | 37.0 | 58.6 |
MGE 8 mm | 34.0 | 58.1 |
MGE 10 mm | 31.0 | 57.5 |
How the acoustic simulation model works
Data required for the simulation
Type of slab
MGE thickness
Floating screed thickness (5 cm – 100 kg/m²)
Number of equivalent sources
Model outputs
ΔLw estimated
Final L’n,w of the build-up
Verification against DPCM 5/12/97
Compliance with acoustic performance requirements
Regulatory compliance – Italian Decree DPCM 05/12/1997
Residential building limits
Limit L’n,w ≤ 63 dB
All PRISMI MGE ≥ 4 mm are compliant.
Who this tool is for
Professionals and construction companies
Contractors
Designers
Acoustic consultants
Project managers
FAQ – Impact sound & ISO 12354-2
What is dynamic stiffness s’?
It measures the ability of a material to reduce impact vibrations.
What L’n,w can PRISMI MGE achieve?
From 61.5 dB (3 mm) down to 57.5 dB (10 mm).
Is it compliant with regulations?
Yes. For residential buildings MGE ≥ 4 mm complies.
Is the model valid for renovations?
Yes, for both new builds and refurbishments.
