BUILDING PHYSICS 11 CLT BBS ceiling in visual surface quality – optimisation of the flank transmission of the ceiling support on an apartment partition wall CLT BBS ceilings with wooden surface visible on the bottom side contribute to the flank transmission between adjacent rooms (see Figure 8). Current measurements of the flank insulation value RFf have shown that a ceiling reinforcement using filling in combination with a wet screed floor structure results in a substantial improvement of the flank insulation (vibro-acoustics research project). Figure 8 – Different path of the flank sound transmission in the ceiling area A 150-mm thick binderholz CLT BBS 125 ceiling that rests on an 80-mm thick CLT BBS 125 wall results in a measured RFf,w of 44 dB. If an element consisting of 60-mm chipping filling, a 40-mm footfall sound insulation board and 50-mm concrete screed is applied on the 1500mm thick CLT BBS ceiling, the measured RFf,w increases to 61 dB. If a continuity effect of the CLT BBS ceiling is dispensable in terms of structural stability, a separation of the ceiling fields in the axes of the apartment partition walls is an effective measure to improve the flank insulation. With a continuous 150-mm thick CLT BBS 125 ceiling, the measured flank insulation value is RFf 44 dB (as described above); with execution of a separating cut, the measured value for RFf increases to 49 dB. Another possibility to improve the flank insulation is to provide the flanking ceilings with an additional suspended ceiling with direct supports with vibration decoupling (see Figure 9). This way, the energy applied on the CLT BBS ceiling in the transmitting room and the deflection into the receiving room is significantly reduced. Figure 9 – Suspended ceiling with vibration decoupling
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