Vermiculite
Masonry Insulation


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 Sound Transmission

Average Sound Transmission
Loss in Decibels
Wall TypeCores EmptyCores Filled with VermiculiteNoise Reduction Percentage (a)
8" painted lightweight block
43
48(b)
31%
8" unpainted heavyweight block
45
48(c)
21%(d)

(a) Decibel reduction converted to sones and expressed as a percentage reduction in loudness.
(b) STC-48
(c) STC-52
(d) 31% when block filled and painted.


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 Solid Brick and Block Walls

4" Face Brick
4" Common Brick
6 " Concrete Block
(Lightweight)		Uninsulated
.34
.33
Insulated
.23
.21
8" Concrete Block
(Lightweight)		Uninsulated
.29
.26
Insulated
.16
.15
8" Concrete Block
(Sand & Gravel)		Uninsulated
.43
.37
Insulated
.31
.28


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Concrete Block Walls

Block Only
Block Insulated Furred & Plastered (e)
Wall Thickness in Inches Type
pf Block		Uninsulated Insulated1" Air Space Uninsulated 1 " Air Space Insulated
6
Lightweight
.40
.26
.18
.15
8
Lightweight
.33
.17
.13
.11
Sand & Gravel
.53
.36
.23
.18
12
Lightweight
.30
.15
.12
.11
Sand & Gravel
.47
.33
.22
.17
(e) 3/8 " gypsum lath and 1/2" of vermiculite-gypsum plaster.


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Cavity Walls

4" Exterior Wythe
Face
Brick 		Common
Brick 		Concrete
Block
Actual Cavity Dimension, In.
2.54.52.54.52.5 4.5
4" Concrete Block
(Sand & Gravel)		Uninsulated.34.34.30.30.31.31
Insulated.13.08.13.08.13.08
4" Concrete Block (Cinder)
or 4" Clay Tile		Uninsulated.30.30 .27.27.25.25
Insulated.13.08.12.08.12.08
4" Concrete Block
(Lightweight)		Uninsulated.27.27.24.24 .21.21
Insulated.12.08.12.08.11.07
6" Concrete Block
(Lightweight) 		Uninsulated.26.26.23.23 .20.20
Cavity Insulated .12.08.11.08.10.07
Block & Cavity
Insulated 		.10.07.10.07.10.07
8" Concrete Block
(Lightweight)		Uninsulated.22.22.21 .21.18.18
Cavity Insulated.11.07.11.07.10.07
Block & Cavity
Insulated		.08.06.08.06.08.06
4" Face Brick Uninsulated.37.37
Insulated.14.09
4" Common Brick Uninsulated.33.33.29.29
Insulated.13.08.13.08


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 Approximate Coverage(f)

Sq. ft. of wall area
1"
Cavity
2"
Cavity
2.5"
Cavity
4.5"
Cavity
8"
Block
12"
Block
100
2
4
5
9
7
13
500
10
20
25
45
34
63
1,000
21
42
50
95
69
125
2,000
42
84
100
189
138
250
3,000
62
124
150
279
207
375
5,000
104
208
250
468
345
625
7,000
146
292
350
657
483
875
10,000
208
416
500
950
690
1,250
(f) 4-cubic foot bags required to fill



8" Lightweight Concrete Block 12" Lightweight Concrete Block
Polystyrene Board Thickness
"U" Value of Wall
Polystyrene Board Thickness
"U" Value of Wall
1"
.0883
1"
.0825
1 1/2"
.0723
1 1/2"
.0684
2"
.0612
2"
.0584


Vermiculite Masonary Insulation


(Draft - Under Construction)