Application of the Concept of Reference Timber Joist Ceiling

Invited paper

Jochen Seidel

Knauf Gips KG

Tuesday 2 june, 2015, 15:00 - 15:20

Auditorium 2 (592)

The sound reduction of timber joist ceilings is determined by many construction details. Major and minor differences lead to a large number and diversity of ceilings. This paper presents a project with the aim of providing airborne and impact sound insulation data of a large set of constructions. The basic idea is to boost a series of measurements by calculatory extensions. A reference ceiling without floating screed has been defined. The improvement of various floating screeds (dry, wet, with/without heating system, different loading capacities, etc.) with respect to the bare basic reference ceiling has been measured. Furthermore, variations of the cladding on the lower side have been tested in addition to the sound insulation of the reference ceiling itself. It is intended to compare calculations based on single number quantities with those based on 1/3 octave data and simple interpolation. Frequencies down to 50 Hz and the spectrum adaption term C<sub>I,50-2500</sub> are included in the analysis. A parallel series of tests on a similar reference ceiling enables comparison of calculation and test result. It is intended to derive estimators of the uncertainty. Support for the concept is deduced as well as an example of its limitations.

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