Double walls in row houses with incomplete separation

Double walls in row houses with incomplete separation
(English summery)
Sponsered by:
Bundesamt für Bauwesen und Raumordnung (BBR)
Deichmannsaue 31-37, 53179 Bonn
BBR Z 6 – 5.4-02.19
By using an unseparated ground plate and unseparated flanking cellar walls, a reduction of costs can
be achieved in row houses with double walls. Further, due to reasons of engineering (protection against
ground water) it can be called for creating a building without slits in the ground plate an in the cellar
walls.
Until now, there are no calculation-values given in the german DIN 4109 "Schallschutz im Hochbau" for
the sound reduction of such these constructions with incomplete separated double walls. In extention to
the calculation-scheme of DIN 4109 it is now proposed, to use a qualitative ∆Rw-additional to consider
the incomplete separation.
The proposed ∆Rw-additional is based on measurement-values of incomplete separated constructions.
Further, for the first time, a calculation according to DIN EN 12354-1 is performed for incomplete
separated double walls. This can be done by treating the incomplete separated junctions as generalized
cross junctions with ground contact.
Parts of this work are published in:
Jürgen Maack, Elmar Sälzer
"Double-Walls with complete and incomplete Separation"
Proceedings of the joint congress CFA/DAGA '04, Strasbourg, 531 - 532 (2004).