This additional sound wasn’t taken into account before but now it must be considered ( light blue lines in right image).įig 1 Flanking noise: noise transmitted through wall, ceiling and floor junctions (credit: NRC) This is known as “flanking” noise ( right image). Sound travels through indirect paths such as ducts, duct walls, floors, ceilings, windows or even gaps and cracks. The challenge with the old building code is that it only considered the wall separating two spaces ( left image), yet we know sound does not only travel through the air from one room to another. This is the first major update to the Sound Transmission section in 30 years. The changes are significant and have a tremendous impact on acoustics. In 2020, the Ontario Building Code (OBC) followed suit with amendments to the Sound Transmission sections but the changes flew under the radar because everyone was focused on the pandemic. ![]() ![]() In 2015, I wrote my first article here discussing the proposed changes to the National Building Code and what the impact on acoustics.
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