Dowel Laminated Timber Akustik Box Element

Name: Dowel Laminated Timber Akustik Box Element
Brand: Holz Suttner

Suttner Dowel Laminated Timber Akustik Box Element

NRC 0.60–0.75

Ceiling

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Manufacturer

Holz Suttner

Holz Suttner is a family-run solid timber business in Haselbach, Lower Bavaria. Its core product is Dübelholz, dowel laminated timber in which softwood lamellas, mostly spruce, are joined with beech dowels into flat elements without glue. It makes wall, floor and roof elements, timber-concrete composite floors and solid timber houses, with in-house CNC joinery and prefabrication. The acoustic range is based on the Akustik Premium profile. Each lamella is slotted on its exposed face, with a wood fibre absorber filling the cavity behind. The loadbearing element is thus both finished exposed surface and absorber. It is used for ceilings, walls and roofs, for example in day nurseries, schools, offices, and sports and event halls.

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Documents

Product brochure Dowel Laminated Timber Declaration of Performance Dowel Laminated Timber

Description

Dowel laminated timber box element by Suttner with an overall depth of 7.1 in. Seen from below, it looks like the Akustik Premium 65; behind it is a larger cavity (empty or insulated with wood fibre) that improves absorption at low frequencies. Used as a ceiling in spaces with room acoustics requirements such as nurseries, schools, offices and halls.

Technical data

Material: Box made of spruce wood with plywood panel

Surface: Timber slats 0.47 × 1.8 in with 0.55 in gap, from below like Akustik Premium 65

Fire class (EN 13501-1): Dowel laminated timber D-s2,d0

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 3 variants

NRC

0.75

Frequency values

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Compare		Value
	box elements only, without cavity insulation	NRC0.75
	box elements only, with cavity insulation	NRC0.70
	box elements between Premium 65 elements, without cavity insulation	NRC0.60

Test report: 60293185-001

NRC: 0.75 (derived from ISO 354 lab data)

Institute: TÜV Rheinland

Measurement date: 09/11/2019

Room volume: 13,829 cu ft

Object area: 140 sq ft

Test setup: box elements only, without cavity insulation

Measured values as a table (3 measurements)

Dowel Laminated Timber Akustik Box Element: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	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
7.1 in · box elements only, with cavity insulation	0.70	0.42	0.34	0.54	0.62	0.66	0.64	0.63	0.66	0.73	0.76	0.78	0.77	0.77	0.79	0.81	0.81	0.77	0.73
7.1 in · box elements only, without cavity insulation	0.75	0.21	0.30	0.49	0.65	0.68	0.66	0.67	0.68	0.71	0.74	0.78	0.77	0.77	0.79	0.83	0.83	0.79	0.75
7.1 in · box elements between Premium 65 elements, without cavity insulation	0.60	0.09	0.11	0.26	0.35	0.42	0.48	0.55	0.61	0.66	0.67	0.71	0.71	0.73	0.75	0.81	0.83	0.82	0.77

Measured values as a table (3 measurements)

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Last updated: 11/04/2026

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