Materials
A Guide to Acoustic Materials Available in Poland
Wood wool cement board (WWCB). A composite panel that combines mechanical durability with acoustic absorption, available through Polish distributors under brands including Heradesign (Knauf) and Viroc. Source: Wikimedia Commons.
The term "acoustic material" is applied loosely across product categories that serve different acoustic functions. This guide distinguishes between materials used for sound absorption (reducing reverberation within a space), sound insulation (reducing transmission between spaces), and combination products that address both to varying degrees. Each category is described with reference to products available through Polish construction suppliers as of 2025–2026.
Sound absorption vs. sound insulation
Sound absorption is measured as the sound absorption coefficient (α), ranging from 0 to 1, and is classified by European standard EN ISO 11654 into absorption classes A through E. High absorption class (A) materials absorb a large proportion of incident sound energy and are used to reduce reverberation time within rooms.
Sound insulation is measured as the sound reduction index (Rw) and describes how much sound transmission is blocked by a construction element. Insulation depends primarily on mass, stiffness, and decoupling, not on absorption coefficient. A high-absorption material is not necessarily a high-insulation material.
Mineral wool (wełna mineralna)
Mineral wool products in roll and slab formats. Both glass wool (wełna szklana) and rock wool (wełna skalna) are classified as mineral wool and are widely available in Poland. Source: Wikimedia Commons.
Mineral wool — encompassing both rock wool (wełna skalna) and glass wool (wełna szklana) — is the most widely used acoustic infill material in Polish construction for partition walls, floor build-ups, and ceiling voids. It is available in slab (płyta) and roll (rolka/mata) formats from manufacturers including Rockwool Poland, Isover (Saint-Gobain), Knauf Insulation, and Ursa.
Rock wool (wełna skalna)
Rock wool is produced by melting basaltic rock and spinning the melt into fibres. It has a higher density range than glass wool and is available in acoustic-specific grades with densities typically between 40–100 kg/m³. Products labelled for acoustic use (e.g., Rockwool Acoustic, Isover Akustik) are formulated to provide high mid-frequency absorption (absorption class A at typical thicknesses of 50–100 mm). Rock wool is non-combustible and dimensionally stable, which makes it suitable for fire-rated assemblies. Its main disadvantage for exposed surface applications is that it requires facing or protection from physical contact.
Glass wool (wełna szklana)
Glass wool offers lower density (typically 11–32 kg/m³ for standard insulation grades) and is more flexible than rock wool slabs. It performs well as acoustic infill in stud partitions and suspended ceiling voids. For partition infill, mid-density glass wool (around 20–30 kg/m³) provides adequate acoustic performance. Lower-density products intended primarily for thermal insulation are less effective for acoustic applications.
Acoustic foam (pianka akustyczna)
Polyurethane acoustic foam in wedge, pyramid, or flat tile formats is widely sold in Poland for room acoustic treatment. These products have absorption class A–B at mid to high frequencies (typically 500 Hz and above) but provide near-zero additional sound transmission reduction compared to an untreated wall. They are appropriate for reducing reverberation in rooms used for recording, conferencing, or critical listening, but do not address flanking or mass-related transmission.
Foam thickness significantly affects the frequency range treated. A 25 mm foam tile provides meaningful absorption above approximately 500–1000 Hz; 50–100 mm tiles extend useful absorption down to approximately 250 Hz. Very low-frequency absorption (below 125 Hz) is not efficiently addressed by foam and requires different treatment strategies (bass traps with mineral wool or dedicated low-frequency absorbers).
Absorption class reference (EN ISO 11654)
Class A: αw ≥ 0.90 · Class B: 0.80–0.85 · Class C: 0.60–0.75 · Class D: 0.30–0.55 · Class E: 0.15–0.25. The weighted sound absorption coefficient (αw) is determined from measurements at 250, 500, 1000, 2000, and 3150 Hz.
Wood wool cement board (płyty drewniano-cementowe)
Wood wool cement board (WWCB) is a composite panel made from wood shavings (typical fibre length 15–25 mm) bound with Portland cement. Products include Heradesign (Knauf), Viroc (distributed in Poland), and Cetris. WWCB panels combine structural rigidity with acoustic absorption and are used as exposed ceiling and wall panels in commercial, educational, and sports building interiors.
Typical absorption performance of 25 mm WWCB reaches class C–D at low frequencies and class A–B at mid frequencies. When mounted with an air gap of 50–100 mm, the effective absorption at lower frequencies improves. WWCB is dimensionally stable in humidity-variable environments and does not require painting or additional finishing where the raw surface is aesthetically acceptable. In Poland, these panels are commonly specified in school gyms, auditoriums, and covered market halls.
Mass-loaded vinyl (membrana wibroakustyczna / MLV)
Mass-loaded vinyl (MLV) is a limp, dense sheet material (typically 1–2.5 kg/m²) that adds acoustic mass without significant thickness. It is used where room depth is limited — typically laminated to existing walls, suspended as acoustic curtains, or incorporated into floor build-ups under floating screeds. In Poland, MLV is available primarily through specialist acoustic suppliers rather than general building merchants.
MLV is not an absorber — it does not reduce reverberation — but adds transmission loss proportional to its mass per unit area. A 2 kg/m² MLV layer adds approximately 7–9 dB of insulation contribution when properly installed without flanking paths. Its effectiveness depends on maintaining continuity across the surface; mechanical fixings, overlaps, and edges require sealing with acoustic sealant to prevent flanking.
Acoustic plasterboard (gips kartonowy akustyczny)
Specialist acoustic gypsum board differs from standard construction board in density and surface treatment. Products such as Knauf Cleaneo (perforated gypsum board with acoustic backing) are designed for combined absorption and surface finish in suspended ceiling and wall lining applications. Non-perforated high-density gypsum board (e.g., Rigips Habito at 12.5 mm, approximately 14 kg/m²) contributes greater mass to a partition assembly than standard board and is used in acoustic wall systems to increase Rw.
Comparison overview
| Material | Primary function | Absorption class (typical) | Notes |
|---|---|---|---|
| Rock wool acoustic slab (50–100 mm) | Absorption + insulation infill | A–B | Non-combustible; requires facing |
| Glass wool acoustic mat (50 mm) | Absorption + insulation infill | B–C | Flexible; good for ceiling voids |
| Acoustic foam tile (50–100 mm) | Mid–high frequency absorption | A–B (mid-high) | No transmission reduction |
| Wood wool cement board (25 mm) | Mid-frequency absorption + finish | B–C | Structural; used as finish panel |
| Mass-loaded vinyl (2 kg/m²) | Transmission reduction | — | No absorption; adds mass in limited depth |
| High-density gypsum board (12.5 mm) | Mass addition in partition systems | — | Used in layered wall systems |
Where to source materials in Poland
- Rockwool Poland (rockwool.com/poland) — Rock wool acoustic slabs and specialty systems
- Isover (Saint-Gobain Poland) (isover.pl) — Glass wool and rock wool range with acoustic grades
- Knauf Poland (knauf.pl) — Gypsum board systems, WWCB (Heradesign)
- Rigips (Saint-Gobain Poland) (rigips.pl) — High-density gypsum board for acoustic systems
Performance values cited are drawn from published manufacturer data and European standards testing. Actual results depend on installation quality, system configuration, and the specific product variant. Independent technical verification should be sought for performance-critical applications.