BUILDING PHYSICS 9 Overview of the built examples in solid timber construction, enhanced requirements for apartment separating ceilings according to DIN 4109, supplement 2 are fulfilled The table below shows structures in finished buildings that fulfil all enhanced requirements for apartment separating ceilings in consideration of all flanking components (vibro-acoustics research project) BV Ceiling Walls Additional measures Prediction Construction measurement 2 80 50 85 200 Concrete floor screed MFT, s’ = 6 MN / m³ Lime chippings CLT BBS 100 mm CLT BBS Elastomer top and bottom R’w = 63.8 dB L’n,w = 42.5 dB R’w = 66 dB L’n,w = 45 dB 3 65 40 90 100 Concrete floor screed MFT, s’ = 6 MN / m³ Lime chippings Glulam 100 mm CLT BBS 12.5 mm Rigips RF fire protection board Elastomer top R’w = 61.3 dB L’n,w = 45.8 dB R’w = 63 dB L’n,w = 45 dB 4 60 40 15 447 Concrete floor screed MFT, s’ = 6 MN / m³ Fibreboard Wood-concrete compound ≥ 100 mm CLT BBS Facing formwork R’w = – dB L’n,w = 44 dB 5 60 40 90 200 Concrete floor screed MFT, s’ = 6 MN / m³ Lime chippings Glulam 2 x 18 mm Rigips RF fire protection board ≥ 100 mm CLT BBS 2 x 18 mm Rigips RF fire protection board K260 encapsulation R’w = 60.9 dB L’n,w = 44.0 dB R’w = 59 dB L’n,w = 43 dB Improvement possibilities to reduce the flank sound transmission Based on the accompanying research project “vibro-acoustics in the planning process for timber structures” and a number of planning brochures as well as specialised lectures, binderholz and Saint-Gobain Rigips Austria gained valuable and practically applicable insights for the planning of solid timber construction that is optimised in terms of sound insulation. In the following, these measures are explained and the positive effects are presented in a comprehensible way by means of a calculation example. Viewed for themselves, CLT BBS solid timber elements for walls and ceilings are rigid discs. This nature of a disc entails that the flanking components made of large-format elements have a poorer effect for the insulation of the flanks than components that consist of CLT BBS 125 elements. For example, the component of a flanking exterior wall consists of many lined-up elements with width of each 1.25 m that are joined with bolts by a wooden riser. The modular panel joint here works like a spring or a separating cut and thereby provides substantial insulation for the flank transmission (see Figure 5). The measurements of the flank insulation value RFf have been conducted with this modular construction method and the assessed values in the calculation example that are more favourable in terms of sound insulation are applicable only when using this construction method. Source: Vibro-acoustics research project Figure 5 – Difference in the flank sound transmission between CLT BBS 125 and the CLT BBS XL large-format panel Large-format board CLT BBS XL CLT BBS 125
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