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R-values of concrete masonry walls are correlated to concrete density, since thermal conductivity of
concrete increases with increasing density. The following tables list a range of R-values for each density.
Contact Trenwyth Industries for specific block densities.

Table 2 — R-Values For 6 in. (152 mm) Concrete Masonry Walls, hrft2.oF/Btua
Construction
Density of
concrete
Cores empty
Cores filled with b:
Loose-fill insulation
Polyurethane
foamed insulation
Solid grouted
Perlite
Vermiculite
pcf
range
mid
range
mid
range
mid
range
mid
range
mid
Exposed
block, both
sides
85
2.2-2.5
2.4
4.8-6.1
5.3
4.5-5.6
5.0
5.2-7.0
5.9
1.6-1.8
1.7

95

2.1-2.4
2.2
4.1-5.4
4.6
3.9-5.0
4.3
4.4-6.1
5.0
1.5-1.7
1.6
105
2.0-2.2
2.1
3.5-4.8
4.0
3.3-4.5
3.8
3.7-5.2
4.3
1.4-1.6
1.5
115
1.8-2.1
2.0
3.0-4.2
3.4
2.9-4.0
3.3
3.1-4.5
3.6
1.4-1.5
1.4
125
1.7-2.0
1.8
2.5-3.7
3.0
2.5-3.5
2.9
2.6-3.9
3.1
1.3-1.5
1.4
135
1.6-1.9
1.7
2.2-3.2
2.6
2.2-3.1
2.5
2.2-3.4
2.7
1.3-1.4
1.3

 

Table 3 — R-Values For 8 in. (203 mm) Concrete Masonry Walls, hrft2.oF/Btua
Construction
Density of
concrete
Cores empty
Cores filled with b:
Loose-fill insulation
Polyurethane
foamed insulation
Solid grouted
Perlite
Vermiculite
pcf
range
mid
range
mid
range
mid
range
mid
range
mid
Exposed
block, both
sides
85
2.4-2.7
2.5
6.3-8.2
7.1
5.9-7.5
6.6
6.9-9.4
8.0
1.9-2.1
2.0

95

2.3-2.6
2.4
5.3-7.2
6.1
5.0-6.7
5.7
5.8-8.1
6.7
1.7-2.0
1.8
105
2.1-2.4
2.2
4.5-6.3
5.2
4.3-5.9
4.9
4.8-7.0
5.6
1.6-1.9
1.7
115
2.0-2.3
2.1
3.8-5.5
4.4
3.7-5.2
4.3
4.0-6.0
4.7
1.5-1.8
1.6
125
1.9-2.2
2.0
3.2-4.8
3.8
3.1-4.6
3.7
3.3-5.1
4.0
1.5-1.7
1.5
135
1.7-2.1
1.9
2.7-4.2
3.3
2.7-4.0
3.2
2.8-4.4
3.4
1.4-1.6
1.5

 

Table 4 — R-Values For 10 in. (254 mm) Concrete Masonry Walls, hrft2.oF/Btua
Construction
Density of
concrete
Cores empty
Cores filled with b:
Loose-fill insulation
Polyurethane
foamed insulation
Solid grouted
Perlite
Vermiculite
pcf
range
mid
range
mid
range
mid
range
mid
range
mid
Exposed
block, both
sides
85
2.5-2.9
2.7
7.5-9.9
8.5
7.0-9.1
7.9
8.2-11.3
9.5
2.1-2.4
2.2

95

2.4-2.7
2.5
6.3-8.7
7.2
6.0-8.0
6.8
6.7-9.7
7.9
1.9-2.2
2.0
105
2.2-2.5
2.3
5.2-7.5
6.1
5.0-7.0
5.8
5.5-8.2
6.6
1.8-2.1
1.9
115
2.1-2.4
2.2
4.4-6.5
5.2
4.2-6.2
5.0
4.6-7.0
5.5
1.7-2.0
1.8
125
1.9-2.3
2.1
3.7-5.6
4.4
3.6-5.4
4.3
3.8-6.0
4.6
1.6-1.9
1.7
135
1.8-2.1
2.0
3.1-4.9
3.7
3.0-4.7
3.6
3.2-5.1
3.9
1.5-1.8
1.6

 

Table 5 — R-Values For 12 in. (305 mm) Concrete Masonry Walls, hrft2.oF/Btua
Construction
Density of
concrete
Cores empty
Cores filled with b:
Loose-fill insulation
Polyurethane
foamed insulation
Solid grouted
Perlite
Vermiculite
pcf
range
mid
range
mid
range
mid
range
mid
range
mid
Exposed
block, both
sides
85
2.6-3.0
2.8
9.1-12.1
10.3
8.5-11.0
9.6
10.0-13.8
11.5
2.3-2.6
2.4

95

2.4-2.8
2.6
7.6-10.5
8.8
7.2-9.7
8.2
8.2-11.8
9.6
2.1-2.4
2.3
105
2.3-2.6
2.4
6.3-9.1
7.4
6.0-8.5
7.0
6.7-10.0
8.0
2.0-2.3
2.1
115
2.1-2.5
2.3
5.2-7.9
6.2
5.1-7.4
6.0
5.5-8.5
6.6
1.9-2.2
2.0
125
2.0-2.3
2.2
4.4-6.8
5.3
4.2-6.5
5.1
4.5-7.2
5.5
1.8-2.0
1.9
135
1.9-2.2
2.0
3.6-5.8
4.4
3.6-5.6
4.3
3.7-6.1
4.6
1.7-1.9
1.8

Additional r-values can be achieved with factory-installed expanded polystyrene, such as Korfil or Icon. Consult manufacturer for added r-values.

Information based on data published by the National Concrete Masonry Association. See NCMA TEK Note 6-2A, available at www.trenwyth.com.


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