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HOME >> NEWS >> Perforated Sound Absorbing Panels to Eliminate Stairwell Echo

Perforated Sound Absorbing Panels to Eliminate Stairwell Echo

Stairwells in offices, schools, and residential buildings often suffer from harsh echo and noise buildup due to reflective surfaces and narrow vertical geometry. This article explains how to eliminate stairwell reverberation using perforated acoustic panels made from MDF or plywood. It includes design guidelines on hole sizing, panel thickness, and mounting strategies, along with real-world results showing RT60 reduction from 2.6 to 0.8 seconds. Backed by ISO 354 and ASTM E84 standards, this method improves acoustic comfort, speech privacy, and code compliance.

Perforated Sound Absorbing Panels to Eliminate Stairwell Echo

Introduction

Stairwells are often designed with hard surfaces like concrete, glass, or metal that cause excessive echo and reverb.    These vertical, narrow spaces can unintentionally amplify footsteps, speech, and mechanical noise.    Installing perforated sound absorbing panels is one of the most effective ways to manage acoustic reflections in stairwells, as supported by    MDPI's material studies and    ArXiv-based acoustic modeling.

Acoustic Problems in Stairwells

  • Multiple parallel walls lead to flutter echo and standing waves.

  • Hard materials reflect sound fully, causing discomfort and speech unintelligibility.

  • Noise travels vertically between floors, violating ISO 354 acoustic comfort standards.

  • Reverberation time (RT60) can exceed 2.5 seconds in untreated stairwells.

Designing Perforated Acoustic Solutions

  • Install perforated wall or ceiling panels along vertical shafts or landings.

  • Use 3–6 mm diameter holes in 12–18 mm MDF or plywood backed with mineral wool.

  • Perforation ratio of 6–10% offers ideal balance of absorption and panel strength.

  • Apply modular design with concealed mounting systems for aesthetics and serviceability.

Installation Recommendations

  1. Target mid-wall height or soffit areas where echoes build up.

  2. Cover 25–50% of surface area for meaningful RT60 reduction (source:      ResearchGate echo decay modeling).

  3. Seal edges and apply acoustic backers to avoid sound leaks around panel gaps.

  4. Use fire-rated coatings to meet ASTM E84 standards in stairwells.

Benefits of Perforated Panels in Stairwells

  • Reduce echo and increase clarity in multi-floor buildings (residential, schools, offices).

  • Improve speech privacy between floors or near stair access doors.

  • Enhance aesthetics with natural or laminated finishes (see      Jintong Perforated Panels).

  • Comply with building codes and LEED acoustic comfort credits.

Example Application

In a 5-story office stairwell, installing 30% wall coverage with 15 mm perforated panels reduced reverb time from 2.6 s to 0.8 s.    Panels included a 30 mm air cavity with glass wool and concealed aluminum rails for mounting.

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