SilentRoot cloud Acoustic Ceiling Sail

Name: SilentRoot cloud Acoustic Ceiling Sail
Brand: SilentFiber

NRC 0.60–1.00

EPD availableFree-hangingCeiling

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Manufacturer

SilentFiber

SilentFiber offers a broad portfolio of sustainable acoustic elements made from natural fibres. The product family ranges from the peat-based SilentRoot acoustic panel through the hemp-based SilentHEMP line to specialty products such as SilentSPA (wet room), SilentMOSS (moss picture) and SilentBEE (hexagon). Owner Dipl. Ing. Robert Schwemmer operates as a brand owner with selected European manufacturing partners. Custom formats and individual cutting are available from the first panel onward (max. 3.9 × 7.9 ft). Awards: Green Product Award 2022, Klimaschutzpreis (Climate Protection Prize), Austrian Bauherrenpreis, Green Product Award Finalist 2026.

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EPD Fire protection M1

Description

SilentRoot cloud is the SilentRoot Torf Acoustic Panel, made from surface peat fiber, in the form of a free-hanging ceiling cloud. Hung directly below the structural ceiling or at a distance from it, it suits spaces where the slab should stay exposed or building services must remain accessible. The clouds come in four thicknesses and custom sizes, with freeform cutting and printing as options. Typical settings are conference rooms, office areas, foyers, hospitality and event spaces.

Technical data

Material: Peat-fibre acoustic panel made from surface peat, free-hanging

Surface: matt, porous fibre face, seven standard colours

Fire class (EN 13501-1): B-s3,d0 per EN 13501-1:2018 (low flammability)

Application: Above conference rooms, offices, foyers, hospitality areas and halls

Certifications: M1 Emission Class, EPD per EN 15804+A2, REACH-SVHC-free

Colours: 7 standard colours, any RAL shade except pure white

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 23 variants

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Datasheet 0.79 in

NRC

0.85

Frequency values

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		Value
7.9 in distance to the ceiling	Ceiling sail with 7.9 in distance below the structural ceiling	NRC0.85
3.9 in distance to the ceiling	Ceiling sail with 3.9 in distance below the structural ceiling	NRC0.80
16 in distance to the ceiling	Ceiling sail with 16 in distance below the structural ceiling	NRC0.80
28 in distance to the ceiling	Ceiling sail with 28 in distance below the structural ceiling	NRC0.80
2 in distance to the ceiling	Ceiling sail with 2 in distance below the structural ceiling	NRC0.70
Directly under the ceiling (0 in distance)	Ceiling sail suspended directly below the structural ceiling	NRC0.60

Test report: 17-202-M4

NRC: 0.85 (derived from ISO 354 lab data)

Institute: Akustikverkstan Sweden (accreditation no. 10126, ISO/IEC 17025)

Measurement date: 08/17/2017

Room volume: 7,063 cu ft

Object area: 108 sq ft

Measured values as a table (23 measurements)

SilentRoot cloud Acoustic Ceiling Sail: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	50 Hz	63 Hz	80 Hz	100 Hz	125 Hz	160 Hz	200 Hz	250 Hz	315 Hz	400 Hz	500 Hz	630 Hz	800 Hz	1000 Hz	1250 Hz	1600 Hz	2000 Hz	2500 Hz	3150 Hz	4000 Hz	5000 Hz
0.79 in · Directly under the ceiling (0 in distance) · Ceiling sail suspended directly below the structural ceiling	0.60	0.00	0.00	0.03	0.03	0.05	0.07	0.13	0.19	0.28	0.42	0.53	0.68	0.72	0.78	0.81	0.94	0.91	1.02	1.02	1.02	1.00
0.79 in · 2 in distance to the ceiling · Ceiling sail with 2 in distance below the structural ceiling	0.70	0.00	0.01	0.05	0.06	0.08	0.12	0.17	0.25	0.39	0.57	0.72	0.90	0.93	0.98	0.96	1.01	0.93	1.00	0.98	1.00	1.04
0.79 in · 3.9 in distance to the ceiling · Ceiling sail with 3.9 in distance below the structural ceiling	0.80	0.02	0.04	0.09	0.12	0.15	0.25	0.27	0.41	0.62	0.82	0.94	1.04	1.07	1.06	0.98	0.92	0.87	0.97	1.00	1.01	1.03
0.79 in · 7.9 in distance to the ceiling · Ceiling sail with 7.9 in distance below the structural ceiling	0.85	0.08	0.09	0.18	0.22	0.35	0.40	0.55	0.69	0.88	0.99	1.02	1.01	0.90	0.82	0.90	0.97	0.91	0.99	0.98	1.00	1.03
0.79 in · 16 in distance to the ceiling · Ceiling sail with 16 in distance below the structural ceiling	0.80	0.17	0.12	0.29	0.35	0.58	0.58	0.67	0.83	0.85	0.74	0.66	0.85	0.92	0.88	0.90	0.95	0.90	0.99	1.01	1.01	1.03
0.79 in · 28 in distance to the ceiling · Ceiling sail with 28 in distance below the structural ceiling	0.80	0.20	0.13	0.48	0.36	0.49	0.68	0.64	0.47	0.61	0.75	0.83	0.89	0.86	0.92	0.90	0.96	0.91	0.97	0.99	1.02	1.03
1.2 in · Directly under the ceiling (0 in distance) · Ceiling sail suspended directly below the structural ceiling	0.65	0.00	0.02	0.07	0.07	0.11	0.15	0.24	0.30	0.42	0.57	0.65	0.79	0.79	0.83	0.85	0.93	0.90	0.96	0.97	0.96	0.98
1.2 in · 2 in distance to the ceiling · Ceiling sail with 2 in distance below the structural ceiling	0.70	0.00	0.04	0.07	0.08	0.11	0.17	0.24	0.31	0.44	0.63	0.74	0.85	0.85	0.87	0.87	0.95	0.90	0.96	0.95	0.97	1.02
1.2 in · 3.9 in distance to the ceiling · Ceiling sail with 3.9 in distance below the structural ceiling	0.80	0.03	0.06	0.11	0.14	0.15	0.27	0.29	0.43	0.63	0.82	0.93	1.00	1.03	1.02	0.95	0.91	0.87	0.97	0.99	0.99	0.99
1.2 in · 7.9 in distance to the ceiling · Ceiling sail with 7.9 in distance below the structural ceiling	0.85	0.08	0.11	0.18	0.23	0.29	0.37	0.54	0.68	0.86	0.99	0.99	0.95	0.87	0.83	0.87	0.96	0.91	0.98	0.98	0.99	1.02
1.2 in · 16 in distance to the ceiling · Ceiling sail with 16 in distance below the structural ceiling	0.80	0.18	0.14	0.27	0.35	0.53	0.53	0.71	0.79	0.81	0.72	0.67	0.85	0.91	0.87	0.90	0.95	0.88	0.98	0.98	0.99	0.99
1.2 in · 28 in distance to the ceiling · Ceiling sail with 28 in distance below the structural ceiling	0.75	0.23	0.16	0.46	0.34	0.44	0.62	0.60	0.45	0.57	0.72	0.83	0.88	0.86	0.91	0.90	0.95	0.89	0.97	0.99	1.01	1.01
1.6 in · Directly under the ceiling (0 in distance) · Ceiling sail suspended directly below the structural ceiling	0.75	0.00	0.03	0.06	0.06	0.11	0.21	0.29	0.36	0.52	0.72	0.77	0.86	0.93	0.89	0.92	0.93	0.93	0.96	0.98	1.01	1.08
1.6 in · 2 in distance to the ceiling · Ceiling sail with 2 in distance below the structural ceiling	0.75	0.00	0.04	0.06	0.07	0.12	0.21	0.30	0.38	0.53	0.73	0.79	0.87	0.96	0.92	0.93	0.94	0.89	0.97	0.98	1.00	1.03
1.6 in · 3.9 in distance to the ceiling · Ceiling sail with 3.9 in distance below the structural ceiling	0.85	0.02	0.05	0.09	0.13	0.17	0.29	0.38	0.52	0.70	0.89	0.98	1.07	1.05	1.03	0.95	0.94	0.91	0.99	1.02	1.01	1.05
1.6 in · 7.9 in distance to the ceiling · Ceiling sail with 7.9 in distance below the structural ceiling	0.90	0.08	0.14	0.16	0.27	0.31	0.42	0.62	0.76	0.96	1.05	1.00	1.03	0.92	0.86	0.93	0.98	0.92	1.00	0.99	1.00	1.05
1.6 in · 16 in distance to the ceiling · Ceiling sail with 16 in distance below the structural ceiling	0.85	0.15	0.13	0.27	0.46	0.54	0.56	0.72	0.82	0.92	0.82	0.73	0.96	0.96	0.92	0.94	0.95	0.92	1.00	1.02	1.02	1.03
1.6 in · 28 in distance to the ceiling · Ceiling sail with 28 in distance below the structural ceiling	0.80	0.21	0.14	0.49	0.49	0.54	0.64	0.61	0.51	0.61	0.84	0.87	0.91	0.96	0.96	0.96	0.94	0.95	0.98	1.02	1.01	1.04
2 in · Directly under the ceiling (0 in distance) · Ceiling sail suspended directly below the structural ceiling	0.90	0.00	0.02	0.06	0.08	0.12	0.26	0.36	0.52	0.73	0.94	0.97	1.07	1.13	1.08	1.06	1.08	1.04	1.08	1.09	1.10	1.10
2 in · 3.9 in distance to the ceiling · Ceiling sail with 3.9 in distance below the structural ceiling	1.00	0.00	0.05	0.10	0.16	0.20	0.37	0.48	0.74	0.93	1.13	1.14	1.17	1.15	1.13	1.06	1.07	1.04	1.14	1.10	1.11	1.12
2 in · 7.9 in distance to the ceiling · Ceiling sail with 7.9 in distance below the structural ceiling	1.00	0.09	0.13	0.21	0.36	0.46	0.54	0.71	0.87	1.12	1.22	1.12	1.15	1.10	1.03	1.06	1.08	1.04	1.10	1.08	1.09	1.12
2 in · 16 in distance to the ceiling · Ceiling sail with 16 in distance below the structural ceiling	1.00	0.17	0.13	0.34	0.56	0.72	0.69	0.83	0.93	1.05	1.02	0.92	1.10	1.10	1.06	1.06	1.06	1.04	1.11	1.09	1.08	1.12
2 in · 28 in distance to the ceiling · Ceiling sail with 28 in distance below the structural ceiling	0.95	0.22	0.14	0.60	0.62	0.73	0.71	0.78	0.66	0.79	0.99	1.01	1.09	1.12	1.09	1.06	1.06	1.04	1.11	1.09	1.08	1.12

Measured values as a table (23 measurements)

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Last updated: 11/03/2026

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