Plasterboard 15 mm Round, Glass Wool 90 mm R2.5

Same build with and without the mass-loaded vinyl layer.

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Tests

Effect of MLV

Rw range

19–36dB

spread 17 dB

Highest Rw

36dB

MLV

Largest ΔRw vs first

+18dB

MLV

Sound reduction index

R′ from the 2270, re-referenced to the 0.9216 m² specimen area (−0.35 dB). Grey lines: reference bounds.

Single-number ratings

Open in explorer

	Varies	Test	Rw	C	Ctr	ΔRw vs first	ΔRw vs open	Mean R
	No MLV	Project018	19	−1	−3	ref.	+18	16.6
	MLV	Project057	36	−2	−6	+18	+35	31.8

Rw, C and Ctr per ISO 717-1 over 100–3150 Hz. ΔRw fits the reference curve to the band-by-band difference curve, which is not the same number as subtracting two separately rounded Rw values. Mean R is the arithmetic mean over the 16 rating bands.