When constructing a soundproof house from the ground up, selecting the right wall and ceiling materials is one of the most critical decisions. Among the most commonly used sound-insulating materials, rock wool boards and mineral fiber boards are two top contenders. Both materials are known for their acoustic performance, thermal insulation, and fire resistance, but they differ significantly in density, frequency absorption capability, and suitability for various environments.
The choice ultimately depends on the level of sound isolation required, the type of noise produced, and the intended usage of the space.
Below is a detailed comparison of mineral fiber boards and conventional rock wool boards, including their composition, performance, and recommended application scenarios.
Composition and Performance
Mineral fiber boards—often represented by brands such as Kente—are engineered specifically for acoustic performance. These boards consist of mineral fibers compressed into high-density panels that are optimized for noise reduction. Compared with standard insulation materials, mineral fiber boards have:
Higher density
Better rigidity
More effective low-frequency sound absorption
Enhanced acoustic stability across a broad frequency range
Their dense fiber structure allows them to absorb and dissipate sound energy more efficiently, especially in environments where noise levels are high.
Sound Insulation Effect
Mineral fiber boards typically achieve an NRC (Noise Reduction Coefficient) of 1.00 to 1.20 or even higher.
This means:
Excellent absorption of mid- and high-frequency noise
Significant improvement in controlling low-frequency energy
Reduced reverberation within a room
Better sound isolation between rooms
Low-frequency control is especially valuable, as low-end energy from drums, bass speakers, and subwoofers is the hardest to block.
Advantages
High density = better isolation performance
Their weight and rigidity give them a clear advantage in blocking sound transmission—not just absorbing it.
Effective control of low-frequency noise
Making them ideal for sound-critical spaces.
Stable, long-lasting acoustic property
Their composition ensures years of consistent performance without significant deterioration.
Applicable Scenarios
Mineral fiber boards are commonly used in:
recording studios
professional mixing rooms
drum rooms
rehearsal rooms
home theaters
cinemas
broadcast rooms
high-end audio equipment rooms
These environments demand precise noise control, especially at lower frequencies.
Composition and Performance
Rock wool boards are manufactured by melting natural basalt or slag at extremely high temperatures and spinning the molten material into fibers. These boards are widely used in construction due to their:
excellent heat insulation
high fire resistance
stable sound-absorbing capability
moisture resistance
light-to-medium density
Although primarily designed for thermal and fire protection, rock wool also performs well as a general-purpose acoustic material.
Sound Insulation Effect
Rock wool boards usually have an NRC of 0.90 to 1.00, which is sufficient for most standard residential and commercial environments. They effectively absorb airborne noise and prevent mid- and high-frequency sound transmission.
While rock wool provides good acoustic absorption, it is less effective than mineral fiber board when dealing with:
deep bass
percussion vibration
subwoofer frequencies
heavy musical instrument noise
Advantages
Excellent fire resistance with very high melting point
Moisture resistance, naturally preventing mold growth
Effective thermal insulation, reducing energy consumption
Cost-effective compared to specialized acoustic materials
Suitable for environments with high humidity, including basements and ground-level construction
Easy installation in stud walls, ceilings, and partition systems
Applicable Scenarios
Rock wool is widely used in:
residential wall and ceiling soundproofing
office spaces
commercial buildings
hotels
classrooms
shops
general-purpose acoustic partitions
It performs well for everyday noise isolation but is not typically used for professional-grade sound studios.
Rock Wool Boards: Best for Standard Residential Soundproofing
Rock wool is suitable when:
noise sources are moderate
there are no low-frequency instruments
the construction goal is comfort-level sound insulation
budget efficiency is important
Rock wool offers a balanced combination of:
acoustic absorption
fire resistance
thermal insulation
moisture control
These qualities make it an excellent all-around material for conventional homes, apartments, offices, and shops.
Mineral Fiber Boards: Best for High-Demand, Professional-Level Soundproofing
Mineral fiber boards are recommended when:
powerful low-frequency noise must be contained
the space includes drums, subwoofers, or professional audio equipment
the structure requires strict acoustic isolation
creating a studio-quality environment
minimizing sound leakage into adjacent rooms or floors
Because of their high density and superior NRC rating, mineral fiber boards outperform traditional rock wool in:
low-frequency absorption
resonance control
preventing vibration transmission
overall sound isolation effectiveness
They are the preferred construction material in spaces requiring advanced noise control.
Both mineral fiber boards and rock wool boards are effective materials for soundproofing walls and ceilings, but they serve different purposes:
Rock wool offers excellent performance for general building sound insulation, providing sufficient noise control for most residential and commercial applications.
Mineral fiber board, with its superior density and low-frequency absorption capacity, is the better choice for high-noise, professional-grade environments such as recording studios, music rooms, drum rooms, and other acoustically sensitive spaces.
Selecting the right material depends on the required soundproofing level, budget, and functional purpose of the space.
