1 Scope
NOTE This standard covers prefabricated, surface-applied, and independently suspended sound-absorptive panel assemblies installed as visible finished elements. (1.1)
NOTE The panels in scope share two defining traits: their primary function is sound absorption in an occupied space, and their finished face is exposed to view. This combination distinguishes them from concealed insulation (hidden, thermal or barrier function) and from integrated grid-and-tile ceiling systems (a structural ceiling plane, not a surface-applied finish). (1.2)
NOTE Included assemblies span the full range of absorptive core and face combinations used in architectural acoustics. (1.3)
NOTE The following product families are within scope: (1.4)
- Fabric-wrapped fiberglass and mineral-wool panels.
- Recycled PET (polyester) fiber panels with color-through, exposed-fiber faces.
- Perforated-metal panels with fibrous acoustic infill.
- Wood-slat and wood-veneer panels with perforated or slotted substrates and absorptive backing.
- Polyurethane foam panels with fabric or coated finishes.
- Suspended ceiling clouds (horizontal panels), baffles (vertical panels in rows), and banners.
NOTE This standard governs both wall-mounted and ceiling-mounted absorptive panels in new construction and renovation. (1.5)
NOTE Wall and ceiling applications are governed together because the products, performance metrics (NRC/SAA), fire-classification basis, and submittal requirements are identical; only the mounting hardware and coordination differ, and those differences are handled within the Installation section. (1.6)
NOTE The following are excluded from this standard and are governed by their own standards: (1.7)
NOTE Acoustic panels in this standard are surface-applied or independently suspended absorptive elements. A grid-and-tile system is a complete ceiling plane assembly. Where a project uses both an acoustic tile ceiling and suspended absorptive clouds, each is specified under its own standard and the section boundary is coordinated to prevent double-specifying the same area. (1.8)
NOTE A panel may incidentally accept push-pins and still be specified here when its primary purpose is acoustic; a surface specified primarily for posting or display belongs to the visual display units standard even if it has some absorptive value. (1.9)
2 Referenced Standards
2.1Materials, fabrication, and installation shall comply with the latest adopted edition of each of the following standards unless a specific edition is cited.
2.2Where referenced standards conflict, the more stringent requirement shall govern unless the Architect or Engineer of Record directs otherwise in writing.
| Standard |
Title |
| ASTM C423 |
Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method |
| ASTM E795 |
Mounting Test Specimens During Sound Absorption Tests |
| ASTM E84 |
Surface Burning Characteristics of Building Materials |
| ASTM E1414 |
Airborne Sound Attenuation Between Rooms Sharing a Common Ceiling Plenum |
| ASTM C367 |
Strength Properties of Prefabricated Architectural Acoustical Tile or Lay-In Ceiling Panels |
| IBC |
International Building Code (Section 803, Interior Wall and Ceiling Finish) |
| NFPA 101 |
Life Safety Code (Section 10.2, Interior Finish) |
| UL 2818 |
GREENGUARD Certification Program for Chemical Emissions (GREENGUARD Gold) |
| LEED v4.1 |
Indoor Environmental Quality — Low-Emitting Materials |
3 Submittals
3.1 Action Submittals
3.1.1The Contractor shall submit the following action submittals for review and approval before fabrication:
- Product data for each panel type, including core material, face finish, thickness, edge profile, and standard module sizes.
- Shop drawings showing panel layout, dimensions, edge and reveal details, joint widths, attachment hardware, and blocking requirements.
- Samples of each panel type in the specified face finish and color, minimum 12 in. × 12 in.
- Color and fabric selection range for Architect's selection where a custom finish is specified.
- Mounting and attachment details coordinated with the substrate and with the reflected ceiling plan.
☑ Product data (core, face, thickness, edge, sizes)
☑ Shop drawings (layout, details, hardware, blocking)
☑ Samples (min 12 in. × 12 in. each type)
☐ Color/fabric selection range
☐ Mounting and attachment details
3.2.1The Contractor shall submit the following informational submittals demonstrating compliance with performance and code requirements:
- Acoustic test reports per ASTM C423 stating NRC or SAA and the ASTM E795 mounting type used.
- Surface burning test report per ASTM E84 for the complete panel assembly as fabricated, stating flame spread index and smoke developed index.
- VOC emission certification (GREENGUARD Gold per UL 2818) where required by the project.
- Chain-of-custody documentation (FSC or equivalent) for wood-faced panels where sustainability certification is pursued.
- Manufacturer confirmation of acoustic transparency for any fabric or face finish not part of the manufacturer's tested standard line.
☑ ASTM C423 acoustic test report (NRC/SAA + E795 mounting)
☑ ASTM E84 assembly fire test report (FSI/SDI)
☐ GREENGUARD Gold (UL 2818) VOC certification
☐ FSC chain-of-custody (wood-faced panels)
☐ Acoustic transparency confirmation (custom face finish)
3.3 Closeout Submittals
3.3.1The Contractor shall submit the following closeout submittals before final acceptance:
- Operation and maintenance data, including approved cleaning methods for each face finish.
- Warranty documentation executed in the Owner's name.
- Record list of installed panel types, colors, and quantities keyed to room locations for future replacement.
☑ Maintenance data with approved cleaning methods
☑ Executed warranty documentation
☑ Record list of installed types/colors/quantities
4 Quality Assurance
4.1The manufacturer shall be a firm regularly engaged in producing acoustic panels of the type specified with a minimum of five years of documented production experience.
NOTE Acoustic performance, fire compliance, and dimensional stability depend on controlled fabrication. A manufacturer with an established production record and documented test reports reduces the risk of field-substituted assemblies that have never been tested as a unit. (4.2)
4.3The installer shall be experienced in the installation of architectural acoustic panels and shall follow the manufacturer's written instructions.
4.4Acoustic performance values shall be substantiated by a test report from a qualified independent laboratory, not by manufacturer marketing literature.
4.5The fire classification shall be substantiated by an ASTM E84 test report covering the complete panel assembly — core, facing, and adhesive — as fabricated, not by tests of individual components.
NOTE A fabric tested Class A over a different core, or a core tested without its adhesive, does not establish the rating of the delivered product. Codes regulate the installed interior finish, so the rating must reflect the assembly that is actually mounted on the wall or ceiling. (4.6)
4.7A mock-up shall be provided for projects with custom finishes, custom colors, or panel areas exceeding 500 sq ft to establish the standard of workmanship.
○ Required (custom finish, custom color, or area > 500 sq ft)
● Not required (standard product, limited area)
5 Environmental and Service Conditions
5.1Panels shall be selected for the temperature and humidity conditions of the space in which they are installed.
NOTE Fibrous and fabric-faced panels are dimensionally and acoustically stable in normal conditioned interiors but can sag, delaminate, or support microbial growth in sustained high humidity. Matching the core and facing to the service environment is a selection decision, not a field adjustment. (5.2)
5.3Panels in spaces subject to sustained high humidity shall use a moisture-resistant core and facing rated for the expected relative humidity.
NOTE Natatoriums, locker rooms, shower areas, and some food-service spaces routinely exceed 80% relative humidity. Standard fiberglass and fabric assemblies are not suitable; mineral-wool or closed-cell foam cores with moisture-resistant facings are required. (5.4)
● Standard interior (RH up to 70%)
○ Elevated humidity (RH up to 90%, moisture-resistant facing)
○ High humidity / wet area (RH up to 95%, moisture-resistant core and facing)
5.5Panels in corridors, gymnasiums, and other high-traffic or contact-prone areas shall be specified with an impact-resistant core.
NOTE Standard panels resist roughly 50 lbf to 100 lbf of surface force, which is adequate for offices and conference rooms but not for spaces where balls, carts, or repeated contact occur. High-impact cores and reinforced facings are tested separately (manufacturer test or ASTM C367) and are specified explicitly where contact is expected. (5.6)
● Standard (office, conference, low-contact)
○ High-impact (corridor, gymnasium, healthcare, contact-prone)
6.1Each panel type shall achieve the specified minimum sound absorption value, stated as NRC or SAA, when tested per ASTM C423 at the cited ASTM E795 mounting.
NOTE NRC (Noise Reduction Coefficient, a four-band average) and SAA (Sound Absorption Average, a twelve-band average from 200 Hz to 2500 Hz per ASTM C423:2017) are interchangeable single-number metrics on the same 0 to roughly 1.0+ scale. SAA is the more accurate current output; many datasheets still publish NRC. Either is acceptable provided the cited value, the metric used, and the mounting type are stated together. (6.2)
6.3The specified absorption value shall always be accompanied by the ASTM E795 mounting type at which it is achieved.
NOTE A panel can read NRC 0.80 on a Type E mounting with an air gap and only NRC 0.65 mounted directly to the substrate. Stating a number without its mounting type makes the requirement unverifiable and invites substitution of a lower-performing assembly that nominally "meets" the value at a more favorable, untested mounting. (6.4)
6.5The fabric or face finish shall be acoustically transparent; impermeable face finishes that defeat absorption are prohibited.
NOTE Many decorative fabrics have near-zero acoustic transparency. Sealing an absorptive core behind an impermeable face reflects sound and negates the panel's purpose. Acoustic transparency is confirmed by the manufacturer or established by a minimum open-area criterion. (6.6)
6.6.1The face fabric shall have a minimum open area of 10%, or the manufacturer shall confirm acoustic transparency for the specific finish in writing.
● NRC (4-band Noise Reduction Coefficient)
○ SAA (12-band Sound Absorption Average, ASTM C423:2017)
0.551.15
Default: 0.7 NRC/SAA
6.7The mounting condition specified for performance shall match the mounting condition tested.
NOTE The ASTM E795 mounting type defines the air gap behind the panel. An air gap raises low-frequency absorption substantially: a Type E mounting with a 100 mm gap can add 0.05 to 0.15 NRC units relative to direct mounting. The specified mounting must match the manufacturer's tested mounting, and the as-built air gap must match the specified one. (6.8)
Type A (direct to solid substrate, no air gap)
Type E-100 (furred 100 mm air gap)
Type E-400 (suspended 400 mm air gap)
Type D (suspended cloud)
6.9Panels used in open-plan offices with a shared ceiling plenum shall meet the project's Ceiling Attenuation Class requirement where speech privacy between bays is required.
NOTE Where suspended clouds or panels are part of an open-plan acoustic strategy, Ceiling Attenuation Class (CAC) per ASTM E1414 governs plenum-borne sound transmission between adjacent areas. This is a separate concern from absorption (NRC/SAA) and is specified only where speech privacy across a shared plenum is a design goal. (6.10)
7 Panel Construction
7.1 Core Material
7.1.1The panel core shall be selected to meet the acoustic, fire, sustainability, and service-condition requirements of the application.
NOTE Core type is the primary driver of acoustic performance, fire rating, moisture tolerance, and environmental profile. Fiberglass and mineral wool dominate fabric-wrapped commercial work; recycled PET offers a color-through, fabric-free option; wood-based and foam cores serve specific aesthetic and budget niches. (7.1.2)
Rigid fiberglass
Mineral wool
Recycled PET (polyester) fiber
Wood-based with absorptive backer
Polyurethane foam
7.1.3The core shall provide the dimensional stability required to maintain a flat, true face over the panel's service life under the project's environmental conditions.
7.2 Panel Thickness
7.2.1Panel thickness shall be selected for the required absorption spectrum, with thicker panels specified where low-frequency absorption is critical.
NOTE A 1 in. (25 mm) panel is the commercial default and delivers good mid- and high-frequency absorption. Low-frequency absorption (125 Hz to 250 Hz) improves with thickness, so 1.5 in. and 2 in. panels are specified for music rooms, recording suites, and conference rooms where HVAC rumble and low-frequency speech energy must be controlled. (7.2.2)
1 in. (25 mm)
1.5 in. (38 mm)
2 in. (50 mm)
7.3 Face Finish
7.3.1The face finish shall be selected for the required aesthetics, durability, and acoustic transparency of the application.
NOTE Face finish governs appearance, durability, cleanability, and whether the panel accepts push-pins. Each face type carries trade-offs: fabric wraps offer the widest color range, perforated metal resists impact and abuse, wood faces provide a warm architectural appearance, and exposed PET fiber needs no separate facing. (7.3.2)
Fabric-wrapped (woven or non-woven)
Perforated metal with absorptive infill
Wood veneer or wood slat with acoustic backing
Exposed PET (color-through fiber)
Painted or coated hard surface
7.3.3Fabric-wrapped face finishes shall be selected from the manufacturer's standard range confirmed acoustically transparent.
7.3.4Acoustic transparency shall be confirmed in writing for any non-standard fabric.
7.4 Edge Profile
7.4.1The panel edge profile shall be specified to match the architectural detail at panel borders and joints.
NOTE Edge profile affects how panels read against adjacent surfaces and how joints align. Square edges give a clean modular grid; beveled and reveal edges articulate joints; radiused and fabric-returned edges soften borders. The profile must be coordinated with the shop drawings and any reveal trim. (7.4.2)
Square
Beveled (reveal)
Radiused
Fabric-returned
Recessed reveal
7.5 Panel Size and Module
7.5.1Panel sizes shall be specified as standard modules wherever the layout permits, with custom field dimensions reserved for conditions that standard modules cannot resolve.
NOTE Standard modules — typically 24 in. × 48 in. and 24 in. × 24 in. — minimize cost and lead time. Custom-cut field dimensions are used at borders, around penetrations, and for feature walls, but they increase cost and should be limited to where they are genuinely needed. Minimum practical panel size is about 12 in. × 12 in.; maximum single panel without special fabrication is about 48 in. × 96 in. (7.5.2)
24 in. × 24 in.
24 in. × 48 in.
48 in. × 48 in.
48 in. × 96 in.
Custom (field-dimensioned)
7.5.3Custom-dimensioned panels shall be field-verified before fabrication where they abut existing construction or other finished trades.
7.6 Tackable Surface
7.6.1Where panels are required to accept push-pins, the face fabric and backing density shall be specified as tackable.
NOTE Tackability is common in classrooms and conference rooms. Not every fabric-wrapped panel accepts and releases push-pins without damage; a tackable assembly requires a compatible face fabric over a backing of sufficient density. Specifying tackability after the fact often forces a panel substitution. (7.6.2)
○ Tackable (accepts push-pins)
● Non-tackable (standard)
8 Fire and Life-Safety Classification
8.1Panels shall meet the interior finish flame spread classification required by the applicable building code for the occupancy and location.
NOTE IBC Section 803 and NFPA 101 Section 10.2 regulate interior wall and ceiling finish by occupancy and by location within the means of egress. Class A finish (flame spread index ≤ 25 and smoke developed index ≤ 450 per ASTM E84) is the standard requirement for most commercial, assembly, educational, healthcare, and business occupancies. (8.2)
8.2.1Panels shall carry a fire classification not less than that required by IBC Section 803 for the occupancy and location of installation.
8.2.2The flame spread index and smoke developed index shall be established by an ASTM E84 test of the complete panel assembly as fabricated.
● Class A (FSI ≤ 25, SDI ≤ 450)
○ Class B (FSI 26-75, SDI ≤ 450)
○ Class C (FSI 76-200, SDI ≤ 450)
8.3Polyurethane foam panels shall be used only where the project's required fire classification can be met by a tested assembly.
NOTE Foam panels are lower in cost but commonly achieve only Class B or Class C ratings. They are excluded from locations where the code requires Class A finish unless a specific tested foam assembly demonstrably meets Class A. (8.4)
9 Sustainability
9.1Where the project pursues sustainability certification, panels shall meet the applicable VOC emission, recycled-content, and chain-of-custody requirements.
NOTE School and healthcare projects frequently require GREENGUARD Gold (UL 2818) certification, and panels that cover walls or ceilings must meet the VOC limits of the LEED v4.1 Low-Emitting Materials credit (Category 5 for ceilings, Category 6 for walls). Recycled content and Red List compliance may be specified where the project's program requires them. (9.2)
9.2.1Panels in schools and healthcare facilities shall be GREENGUARD Gold (UL 2818) certified where required by the project program.
9.2.2Wood-faced panels shall be supplied with FSC or equivalent chain-of-custody documentation where sustainability certification is pursued.
NOTE Chain-of-custody documentation for wood faces is frequently overlooked until closeout, when it cannot be retroactively obtained. Requiring it at submittal prevents a non-compliant product from being installed. (9.2.3)
☑ GREENGUARD Gold (UL 2818)
☐ LEED v4.1 Low-Emitting Materials compliant
☐ Minimum recycled content (project-specified %)
☐ FSC chain-of-custody (wood faces)
10 Suspended Clouds and Baffles
10.1Suspended ceiling clouds and baffles shall be specified where panels are hung free of any continuous ceiling plane.
NOTE Clouds are horizontal panels suspended below the structure; baffles are vertical panels suspended in rows. Both are used where there is no continuous ceiling to surface-mount panels to, such as exposed-structure interiors. Their suspended mounting (ASTM E795 Type D) exposes both faces and edges to the room, which increases effective absorption per unit area. (10.2)
Not applicable (wall or ceiling surface-mounted)
Horizontal cloud
Vertical baffle
Banner
10.2.1Suspension hardware shall be selected for the panel weight and shall be attached only to structure capable of supporting the imposed load.
11 Attachment and Blocking
11.1The attachment method shall be selected for the substrate, the panel weight, and the project's requirement for future replaceability.
NOTE Impaling clips and adhesive suit lightweight panels on solid substrates; Z-clips and mechanical fasteners allow removable, replaceable installation; cable suspension serves clouds and baffles. The method affects installation cost and whether individual panels can be removed for cleaning or replacement. (11.2)
Impaling clips
Z-clips (removable)
Construction adhesive
Mechanical fasteners
Cable suspension
11.3Substrate blocking required to support clip- or fastener-attached panels shall be provided and shown on the drawings.
NOTE Fabric-wrapped panels attached with impaling clips or Z-clips require solid backing — typically 3/4 in. plywood blocking behind the gypsum board. Leaving blocking to the general contractor without showing it generates RFIs and field substitutions when crews find no solid backing at the panel locations. (11.4)
11.4.1Solid blocking shall be provided behind gypsum board at all clip- and fastener-attached panel locations. panel blocking locations 11.4.2Blocking type and extent shall be coordinated with the panel layout and shown on the drawings before the wall is closed in.
12 Installation
12.1Panels shall be installed plumb, level, and true, with consistent joint widths and aligned reveals per the approved shop drawings.
NOTE Acoustic panels are a visible finish, so installation tolerances are dictated by appearance as much as performance. Uneven joints and misaligned reveals are conspicuous on a modular panel wall and are a common source of rejection. (12.2)
12.2.1Panels shall be installed in accordance with the manufacturer's written instructions and the approved shop drawings.
12.2.2Joint widths shall be uniform and shall match the dimension shown on the approved shop drawings.
12.3Panels shall be acclimated to the project's expected temperature and humidity before installation.
NOTE Fibrous and fabric-faced panels can warp or change dimension if installed before they reach equilibrium with the space. Acclimating panels in the conditioned space for a minimum of 24 to 72 hours before installation prevents post-installation warping and joint movement. (12.4)
12.4.1Panels shall be acclimated in the installation space for a minimum of 24 hours, or longer where the manufacturer requires, before installation.
12.5Panel layout shall be coordinated with MEP penetrations and with the reflected ceiling plan before installation begins.
NOTE Recessed lighting, sprinkler heads, exit signs, diffusers, and conduit must be field-coordinated against the panel layout before it is finalized. Panels shown on the architectural finish plan must match the reflected ceiling plan grid or be flagged as a separate layout; unresolved mismatches cause trade conflicts and extensive RFIs in the field. (12.6)
12.6.2The panel layout plan shall be reconciled with the reflected ceiling plan, and any discrepancy shall be resolved before installation.
13 Delivery, Storage, and Handling
13.1Panels shall be delivered, stored, and handled to protect the finished faces from soiling, crushing, and moisture.
NOTE Acoustic panels are a finished product with fragile faces. Soiling of fabric, crushing of edges, and moisture exposure during storage are common causes of pre-installation damage that cannot be field-repaired and that force replacement at the Contractor's expense. (13.2)
13.2.1Panels shall be delivered in the manufacturer's original protective packaging, labeled with type, finish, and color.
13.2.2Panels shall be stored flat, indoors, in a clean, dry, conditioned space and shall be protected from soiling, moisture, and physical damage until installation.
13.2.3Panels with damaged faces or edges shall be rejected and replaced.
13.2.4Panels with damaged faces or edges shall not be installed.
14 Warranty
14.1The manufacturer shall warrant the panels against defects in materials and workmanship for the period specified.
NOTE A manufacturer warranty covers delamination, fabric failure, sagging, and dimensional defects that appear in normal service. The standard commercial term is a manufacturer warranty in addition to the contractor's installation warranty. (14.2)
14.2.1The manufacturer shall provide a written warranty against defects in materials and workmanship for not less than the specified period from the date of Substantial Completion.
14.2.2The installer shall warrant the installation against defects in workmanship for not less than one year from the date of Substantial Completion.
○ 1 year
● 5 years
○ 10 years
15 Cleaning and Maintenance
15.1The approved field cleaning method for each face finish shall be specified so that building operations staff do not damage the panels.
NOTE Fabric-wrapped panels accumulate dust, and some finishes are not field-cleanable beyond dry vacuuming; aggressive wet cleaning can stain or shrink the fabric. Specifying the manufacturer-approved cleaning method (vacuum, damp wipe, or dry-clean only) in the maintenance data prevents damage during routine operation. (15.2)
15.2.1Approved cleaning methods for each face finish shall be included in the closeout maintenance data.
15.2.2Cleaning shall be performed only by the manufacturer's approved method for the installed face finish.
16 Spare Parts
16.1Attic-stock spare panels shall be furnished so that damaged panels can be replaced with matching units from the original production run.
NOTE Acoustic fabrics and PET colors are produced in dye lots, and an exact match cannot be guaranteed from a later order. Furnishing attic stock from the original run ensures that field damage during the building's early service life can be repaired with a true match rather than a visibly different replacement. (16.2)
16.2.1The Contractor shall furnish spare panels of each type, finish, and color equal to the specified percentage of the installed quantity, from the original production run.