Plasterboard 6 mm Round (Reversed), 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

14–29dB

spread 15 dB

Highest Rw

29dB

MLV

Largest ΔRw vs first

+13dB

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	Project064	14	0	−3	ref.	+14	13.1
	MLV	Project065	29	−2	−6	+13	+28	25.2

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.