Overview#
When thunderstorms and typhoons strike, thunder noise can instantly create fear and anxiety indoors. For those interested in soundproofing, the burning questions are: “What level of sound isolation performance is needed to mitigate thunder noise?” and “What structures and equipment are most effective?” This article organizes thunder noise countermeasures from a soundproofing specialist perspective.
Thunder Noise and Sound Pressure Levels#
Let’s first understand the magnitude of thunder noise accurately.
Sound Pressure Levels by Thunder Type
- Direct lightning strike at close range: 100-120dB (jet engine, concert level)
- Thunder from several hundred meters to kilometers away: 70-90dB (subway car, loud voice level)
Important Point: Complete elimination is impossible, but “raising sound isolation performance to convert it to distant thunder” is entirely achievable.
Sound Isolation Performance by Building Structure#
The basic structure of a building directly affects soundproofing performance.
| Structure | Sound Isolation Performance (external wall target) | How Thunder Sounds |
|---|---|---|
| Wooden construction (traditional method) | 25-35dB | Resonates almost as-is |
| 2×4 wooden construction | 30-40dB | Slightly mitigated but explosive sound remains |
| Lightweight steel frame | 30-40dB | Equivalent to wood, low frequencies pass through easily |
| RC construction (reinforced concrete) | 45-55dB | Reduced to distant thunder level |
| RC construction + dual windows | 50-60dB | Significantly reduced, fear diminishes |
Reading Tip: Whether in a wooden house or RC apartment, window reinforcement alone is insufficient for adequate soundproofing effects.
Window Soundproofing is Critical#
Thunder noise enters primarily through windows rather than walls. Window treatment is the top priority.
Dual Windows (Inner Sash)#
Performance: +10-15dB improvement Cost: ¥50,000-150,000 per window
The air gap created between the installed inner window and existing sash dramatically improves sound isolation performance.
Advantages
- Installable in rental housing
- Most products allow restoration to original state
Disadvantages
- Installation costs if replacement is needed
Soundproof Glass#
Performance: +10-20dB improvement Cost: ¥100,000-200,000 per window
Uses thick laminated or dual-pane glass. Requires replacing existing glass, making it suitable for owner-occupied properties.
Soundproof Curtains#
Performance: Several dB improvement (psychological reassurance effect) Cost: ¥10,000-30,000 per window
Weak alone, but mitigates reflected sound and provides psychological comfort.
Storm Shutters & Soundproof Shutters#
Standard Storm Shutters
- Performance: Approximately 5-6dB reduction
- Cost: Several thousand yen
- Features: Easy improvement
Soundproof Shutters
- Performance: Up to 30dB reduction
- Cost (manual): ¥60,000-160,000
- Cost (electric): ¥100,000-350,000
- Features: Makes thunder “very distant.” Blocks both sound and light
Room-Level Soundproofing#
Converting one room to soundproof specifications creates a “refuge room” against thunder noise.
| Construction Method | Sound Isolation Performance | Estimated Cost | Features |
|---|---|---|---|
| Sound isolation sheet + double drywall | ~50dB | ¥200,000-500,000 per room | Most practical construction |
| Simple soundproof booth (ASMR/instrument) | 40-50dB | ¥200,000-800,000 per booth | Modular, movable. Thunder remains but fear diminishes |
| Studio-grade soundproof room | 60dB+ | ¥1,000,000-3,000,000 per room | Professional construction, reduces thunder to distant level |
Construction Method Details#
Sound Isolation Sheet + Double Drywall Method
- Apply sound isolation sheet to existing wall
- Attach double layer of drywall
- Place sound-absorbing material inside
Advantages: Guaranteed effectiveness, relatively low cost Disadvantages: Construction period, noise during work
High-Performance Housing Options#
If searching for new housing, consider these selection criteria.
Structure Selection Guidelines#
Wooden Houses
- Window and wall reinforcement essential
- Professional soundproofing may be necessary
RC Apartments
- Standard 45dB+ sound isolation performance
- Window reinforcement alone can be sufficient
Single-Story vs. Multi-Story
- Single-story: Stronger ground reflection
- Multi-story first floor: Weaker direct impact
Construction Cost Summary#
Soundproofing costs by type:
- Dual window addition: ¥50,000-150,000 per window
- Soundproof glass replacement: ¥100,000-200,000 per window
- Soundproof shutters: Manual ¥60,000-160,000, Electric ¥100,000-350,000+
- Room soundproofing: ¥1,000,000-3,000,000 per room (varies significantly)
Frequently Asked Questions (FAQ)#
Q: I live in a wooden house. Where should I start with thunder countermeasures? A: Window reinforcement is the first priority. Start with dual window installation or soundproof shutters.
Q: I’m in rental housing where construction isn’t possible. What options exist? A: Consider soundproof curtains, noise-canceling earphones, and white noise generators—all reversible solutions.
Q: Are soundproof room costs prohibitive? Are there alternatives? A: Simple soundproof booths (¥200,000-800,000) or closet conversion (¥100,000-200,000) are effective alternatives.
Q: Is there an optimal season for thunder countermeasures? A: The measures themselves are season-independent, but completing installation before rainy season (May-July) or autumn rain season (September-October) provides peace of mind.
Summary#
Thunder is a natural phenomenon we cannot stop. However, by combining soundproofing techniques, you can transform “explosive thunder” into “distant thunder” and create a home that protects concentration and sleep.
Priority Order for Countermeasures#
- Top Priority: Window reinforcement (dual windows, soundproof shutters)
- Secondary: Room-level soundproofing (single dedicated quiet space)
- Long-term: Building structure selection (when house hunting)
For Optimal Selection#
- For work-from-home and sleep protection, RC construction + dual windows is ideal
- Balancing cost and performance, aim for approximately 50dB sound isolation as a realistic target
Start today with measures suited to your situation. Soundproofing is a valuable investment that delivers long-term comfort.