Source google image: http://french.insulationrefractory.com/photo/pl8435543-rockwool_mattress_refractory_rockwool_sound_insulation_with_wire_mesh_20_mm_thick.jpg
Isolation phonique 20 mm
Source google image: http://french.insulationrefractory.com/photo/pl8435543-rockwool_mattress_refractory_rockwool_sound_insulation_with_wire_mesh_20_mm_thick.jpg