The Key Details for Installing Soundproofing Materials?

1. Before Installation: Essential Preparations Are a Must

Thorough Base Treatment: The installation surfaces (walls, floors, ceilings) must be flat, dry, free of dust and oil. Loose bases need reinforcement (e.g., wall cracks filled with sealant). In humid environments (such as bathrooms, basements), a moisture barrier must be applied first to prevent sound insulation materials from getting damp and moldy, which would affect their performance and service life.

Accurate Measurement + Reserved Allowance: Cut materials according to actual dimensions, with a 5-10mm allowance reserved (to avoid gaps due to undersized materials). The cut surfaces must be flat. Porous materials (such as sound insulation cotton) should be prevented from excessive extrusion and deformation (as this will block pores and reduce sound absorption/insulation capacity).

Materials Adapted to the Environment in Advance: Sound insulation cotton, damping sheets, and other materials need to be transported to the construction environment 24 hours in advance to adapt to the temperature and humidity, preventing gaps caused by thermal expansion and contraction after installation.

2. Installation by Location: Key Details Should Not Be Ignored

(1) Wall Sound Insulation

Avoid "Acoustic Bridge" Transmission: When installing keels, a 5-10mm gap must be maintained from the wall (or rubber pads placed), and direct contact between keels and walls/floors/ceilings is prohibited – otherwise, noise will be directly transmitted through the keels, offsetting the sound insulation effect.

Dense Filling Without Gaps: Sound insulation cotton must be "fully filled" without excessive compaction (especially porous sound-absorbing cotton). Corners, wire pipe perforations should be filled with small pieces of material and sealed with sealant around the edges.

Double-Layer Structure for Higher Efficiency: If conditions permit, adopt a "keel + sound insulation cotton + gypsum board" double-layer structure. The joints of gypsum boards should be staggered (to avoid sound leakage through straight joints), and the joint gaps should be sealed with sealant.

(2) Floor Sound Insulation

Dual Protection of Moisture Resistance + Shock Absorption: First lay a layer of PE moisture-proof membrane on the floor (with an overlap width ≥10cm), then lay sound insulation pads (such as XPE, EVA materials). The sound insulation pads must cover the entire floor, and turn up 5-10cm at the wall corners (to connect with the wall sound insulation layer).

Avoid Material Damage: When laying floors (tiles/wooden floors), sharp tools are prohibited from scratching the sound insulation pads; when installing wooden floors, the gaps between skirting boards and the floor must be filled with sealant to prevent noise transmission through the gaps.

(3) Door, Window, and Gap Sealing

Focus on Blocking "Sound Leakage Channels": The gaps between door/window frames and walls should be double-sealed with foam adhesive + sealant (filled with foam adhesive and sealed with sealant on the surface); install sound insulation sealing strips (silicone or EPDM material, suitable for gap size) between door/window sashes and frames; choose insulating laminated glass for glass (which has better sound insulation effect than ordinary insulating glass).

Hardware Accessories Should Not Be Neglected: Door and window hinges and locks must be installed firmly to avoid increased gaps due to loose doors and windows; sliding doors should be equipped with bottom sealing strips to reduce sound leakage through gaps during sliding.

(4) Pipeline Sound Insulation

Layered Wrapping + Firm Fixing: First wrap a layer of damping sheet around the pipeline surface (wrap tightly with an overlap ≥5cm), then wrap with sound insulation cotton, and finally fix with straps (spacing ≤30cm) to avoid loosening; materials suitable for pipeline bends and interfaces should be cut, and no gaps are allowed. The gaps where pipelines pass through walls/floor slabs must be filled with sealant.

3. After Construction: Acceptance and Protection Must Be In Place

Comprehensive Inspection + Effect Testing: After installation, visually inspect all joints, corners, and perforations to ensure they are completely sealed without looseness or gaps; the effect can be verified through simple self-testing (such as playing noise with doors and windows closed and comparing the decibel difference before and after installation). If there is still obvious noise, focus on checking for unsealed gaps or acoustic bridges.