Technical Booklet G Resistance to the Passage of Sound·Page 29·2.22
Calculation of number of ties per square metre
The number of ties per square metre is calculated from horizontal and vertical tie spacing distances using the formula n = 1 / (Sx.Sy).
The number of ties per square metre, n, is calculated from the horizontal and vertical tie spacing distances, Sx and Sy in metres using n = 1 / (Sx.Sy). Example: for horizontal and vertical tie spacing distances of 0.9 m and 0.45 m, n is 2.5 ties/m2.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet G - Resistance to the Passage of Sound.pdf