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Technical Information for
ProBlock Masonry Units ASTM C-90 Compliance
Concrete masonry units (CMU) had not changed much since
1931 with the original publication of ASTM C90, Standard
Specification for Hollow Loadbearing Concrete Masonry
Units, until 2011, with ASTM C90 2011b, which allows for,
but does not require, a unit’s webs to be configured
differently. As a result, CMU designs may be altered in order
to utilize fewer raw materials in production, reduce unit
weight and/or increase energy efficiency of concrete
masonry construction. ASTM C90 changed from requiring a
minimum web thickness to requiring a minimum web area of
6.5 square inches per square foot of face area. No longer are
manufacturers required to have three 1” thick webs on 8”
block; instead an 8x8x16 block could have one web as thin as
0.75” and still meet ASTM C90’s new minimum web area
requirements. Johnson Concrete’s ProBlock utilizes thinner webs and has an open end to
increase energy performance and improve mason productivity and safety. The web area of the
8 and 12 inch ProBlock Energy Max is about 13.8 in2/ft2 which meets the new C90
requirements.
ProBlock comes in an Energy Max version which has higher thermal efficiency and slightly
reduced weight compared to the 2 hour ProBlock version. The 8 inch 2 hour ProBlock has an
equivalent thickness of about 3.7 inches and is produced using only ESCS lightweight
aggregates. The unit configuration and density meets the 2 hour fire rating requirements of
both the International Building Code and North Carolina Building Code. ProBlock meets ASTM
90 requirements for compressive strength when tested as a whole unit or when tested as a
closed cell unit per ASTM C140. The compressive strength of ProBlock is the same as with the
standard lightweight unit produced by Johnson Concrete.
Johnson Concrete is happy to provide project specific R value calculation based on actual grout
spacing, grout material selection and ProBlock selected. Johnson Concrete can also assist in
determination of STC, heat capacity, net and average section properties, fire rating and grout
estimation for projects using the ProBlock. The following sections offer more detail about
some of the features of the ProBlock.
ProBlock Insulated Wall System: Energy Performance
R-value is the measure of thermal resistance used in the building and
construction industries. Higher R-value equates to increased
resistance to heat flow. R-value measures the ratio of the
temperature difference across an insulator (concrete masonry wall)
and the heat flux (heat transfer per unit area per unit time). The key
to maximizing whole-wall R-values of concrete masonry walls is
minimizing thermal bridges within the concrete masonry units, and
increasing the thermal resistance of the concrete used to produce
concrete masonry units. Lightweight concrete is ideal for highest thermal performance concrete
masonry wall assemblies.
Whole-wall R-values for ProBlock walls are much greater than
conventional 3-web concrete block walls. The increase achieved by
injecting aminoplast foam insulation is up to 264% greater than what is
possible with normal weight concrete masonry walls injected with the
same aminoplast foam injection. The table below illustrates the
exceptional thermal performances that can be achieved by specifying
ProBlock / Core Foam Masonry Foam Insulation® Wall Systems.
Density R Value* Increase**
8x8x16
ProBlock Energy Max 85 pcf 10.69 226%
ProBlock 105 pcf 8.27 152%
NW ProBlock 130 pcf 5.44 66%
ProBlock Fire Rated 85 pcf 9.25 182%
Regular LW Block 105 pcf 5.19 58%
Regular NW Block 130 pcf 3.28 0%
12x8x16
ProBlock Energy Max 85 pcf 18.14 264%
ProBlock 105 pcf 13.94 179%
NW ProBlock 130 pcf 8.99 80%
ProBlock Fire Rated 85 pcf 15.6 213%
Regular LW Block 105 pcf 7.84 57%
Regular NW Block 130 pcf 4.99 0%
*Filled with R 4.60/inch injected Core Foam Masonry Foam Insulation®
** Compared to Standard Normal Weight Concrete Masonry Units
R-values of ProBlock walls insulated with aminoplast foam compare favorably with those
insulated with closed-cell polyurethane foam. Because aminoplast foam flows within the wall,
all of the nooks & crannies get filled. Polyurethane foam expands rather than flows; thus, many
more holes must be drilled & patched, expanding foam tends to bridge small openings to leave
voids, and polyurethane foam simply costs far more than aminoplast foam insulation. For these
reasons: better performance and faster installation at a lower cost, Core Foam Masonry Foam
Insulation® @ R-4.60/inch is the better choice for injecting ProBlock and ProBlock Energy Max
walls vs. closed-cell polyurethane foam insulation @ R-5.91/inch. The table below illustrates
how closely whole-wall R-values track one another no matter the type of foam used to fill core-
cells of ProBlock walls.
R-Values w/Foam Insulation
Aminoplast Foam vs.
Polyurethane Foam
Size Block Type Density R-4.6/in. R-5.91/in.
8x8x16
ProBlock Energy Max 85 pcf 10.69 11.39
ProBlock 105 pcf 8.27 8.67
NW ProBlock 130 pcf 5.44 5.60
Regular NW Block 130 pcf 3.28 3.31
12x8x16
ProBlock Energy Max 85 pcf 18.14 19.43
ProBlock 105 pcf 13.94 14.68
NW ProBlock 130 pcf 8.99 9.27
Regular NW Block 130 pcf 4.99 5.05
Demonstrating Energy Code Compliance Using COMCheck: When using COMCheck for energy
code compliance demonstration analysis, the U-value for the wall assembly should be used in
the “other mass wall” section of the program. Below are U-values that can be used in this
portion of the program.
Net U-Value Foam Insulated with Various Grout Spacing
Block Type Density
Foam
R/Inch
32 X
48
48 X
48
48 X
72
72 X
72
8x8x16
ProBlock Energy Max 85 pcf 4.6 0.224 0.199 0.183 0.166
ProBlock 105 pcf 4.6 0.266 0.238 0.221 0.202
12x8x16
ProBlock Energy Max 85 pcf 4.6 0.165 0.151 0.136 0.121
ProBlock 105 pcf 4.6 0.192 0.176 0.161 0.143
In the COMCheck program, when the “other mass” section is used, the heat capacity (HC) of the
wall assembly must be used in conjunction with the U-value. The tables below show HC for
various ProBlock Insulated Wall System assemblies.
8 inch ProBlock
12 inch ProBlock
Grout Spacing Weight/SF HC
Grout Spacing Weight/SF HC
Ungrouted 24.5 5.1
Ungrouted 27.9 5.9
16 X 48 58.7 12.3
16 X 48 90.3 19.0
32 X 48 45.7 9.6
32 X 48 65.6 13.8
48 X 48 41.4 8.7
48 X 48 57.4 12.0
48 X 72 35.9 7.5
48 X 72 48.0 10.1
72 X 72 35.2 7.4
72 X 72 46.7 9.8
R and U Values of Grouted ProBlock Insulated Wall System
to use with COMcheck™
The tables below show the calculated R and U values of 8” and 12” ProBlock, grouted at
various spacing. The R and U values are calculated with the empty cells of the units filled
with R-4.6/inch masonry foam insulation by cfiFOAM, Inc. The ProBlock Insulated Wall
System is calculated using 3/8” mortar joints and normal weight concrete grout. Air films
on both sides of the wall were included in tabulating these R and U values. The series-
parallel (also called isothermal planes) calculation method is used in the calculations.
8 inch ProBlock
Energy Max- 85 pcf
Block Density
Vertical Grout Spacing (Center to Center)
No Grout 16 24 32 48 72
R U R U R U R U R U R U
Horizontal
Grout
Spacing
(Center to
Center)
----- 10.9 0.092 3.54 0.282 4.56 0.219 5.34 0.187 6.43 0.156 7.45 0.134
48 6.43 0.156 3.18 0.314 3.82 0.262 4.25 0.235 4.8 0.208 5.24 0.191
96 8.09 0.124 3.35 0.299 4.16 0.240 4.74 0.211 5.50 0.182 6.15 0.163
120 8.53 0.117 3.38 0.296 4.24 0.236 4.85 0.206 5.66 0.177 6.38 0.157
144 8.85 0.113 3.41 0.293 4.29 0.233 4.92 0.203 5.78 0.173 6.53 0.153
8 inch ProBlock
Energy Max- 105 pcf
Block Density
Vertical Grout Spacing (Center to Center)
No Grout 16 24 32 48 72
R U R U R U R U R U R U
Horizontal
Grout
Spacing
(Center to
Center)
----- 8.53 0.117 3.1 0.323 3.93 0.254 4.54 0.220 5.38 0.186 6.14 0.163
48 5.38 0.186 2.80 0.357 3.33 0.300 3.68 0.272 4.12 0.243 4.47 0.224
96 6.60 0.152 2.94 0.340 3.61 0.277 4.07 0.246 4.66 0.215 5.17 0.193
120 6.91 0.145 2.97 0.337 3.67 0.272 4.15 0.241 4.79 0.209 5.34 0.187
144 7.14 0.140 2.99 0.334 3.71 0.270 4.12 0.243 4.88 0.205 5.46 0.183
Note: The IECC does not prohibit using integral masonry foam insulation in CMU construction. The
Prescriptive Compliance path is presented in Section 502. Section 502.2.3 clarifies that insulation filling
the cells of CMU walls is not considered cavity insulation per Table 502.2 (1). The insulating value of
foam insulation filling the CMU's is taken into account using the U-factor Table, Table 502.1.2. The U-
values shown in these tables are for use with COMcheck™ in lieu of the default U-value representing
granular loose-fill insulation. Neither the COMcheck™ compliance path, nor the Total Building
Performance path of Section 507 prohibits using masonry foam insulation in the core-cells of CMU wall
construction. NCMA TEK 6-4B (2012) provides additional guidance for architects and engineers who
choose to demonstrate energy conservation code compliance by taking advantage of the “trade-offs”
available to those who choose to use COMcheck™ compliance software. COMcheck™ can be downloaded
free of charge from: http://www.energycodes.gov/comcheck/download.stm.
12 inch ProBlock
Energy Max-85 pcf
Block Density
Vertical Grout Spacing (Center to Center)
No Grout 16 24 32 48 72
R U R U R U R U R U R U
Horizontal
Grout
Spacing
(Center to
Center)
----- 18.61 0.054 4.47 0.224 5.98 0.167 7.21 0.139 9.06 0.110 10.93 0.091
48 9.06 0.110 3.96 0.253 4.88 0.205 5.52 0.181 6.34 0.158 7.05 0.142
96 12.18 0.082 4.20 0.238 5.37 0.186 6.25 0.160 7.46 0.134 8.57 0.117
120 13.09 0.076 4.25 0.235 5.49 0.182 6.42 0.156 7.73 0.129 8.95 0.112
144 13.77 0.073 4.29 0.233 5.56 0.180 6.54 0.153 7.92 0.126 9.23 0.108
12 inch ProBlock
Energy Max- 105 pcf
Block Density
Vertical Grout Spacing (Center to Center)
No Grout 16 24 32 48 72
R U R U R U R U R U R U
Horizontal
Grout
Spacing
(Center to
Center)
----- 14.46 0.069 3.99 0.251 5.25 0.190 6.25 0.160 7.71 0.130 9.13 0.110
48 7.71 0.130 3.56 0.281 4.33 0.231 4.87 0.205 5.55 0.180 6.12 0.163
96 10.06 0.099 3.76 0.266 4.75 0.211 5.47 0.183 6.45 0.155 7.33 0.136
120 10.71 0.093 3.80 0.263 4.84 0.207 5.61 0.178 6.67 0.150 7.63 0.131
144 11.19 0.089 3.83 0.261 4.91 0.204 5.71 0.175 6.82 0.147 7.84 0.128
Foundation Load Reduction using ProBlock
ProBlock masonry units are designed with less
material and are produced using ESCS lightweight
aggregates. The combination of the reduced
material and ESCS lightweight aggregates
significantly reduce the weight of the units in the
wall.
The weight per linear foot of walls made with
ProBlock can be reduced by up to 52%. This
foundation load reduction can help minimize
foundation requirements especially where poor
foundation soils are present.
Section Properties of ProBlock
The charts below show the horizontal cross section
(masonry spanning vertically) and vertical cross section
(masonry spanning horizontally) properties of ProBlock
with ¾ inch webs and various grout spacing. The
ProBlock and typical masonry units have the same net
area and similar but slightly lower average areas. The 12
inch ProBlock has a bigger average area difference than
the 8 inch ProBlock.
8 inch Block 20' x 200' wall example
Grout
Spacing
Block
Type
Weight/
LF Decrease
Ungrouted ProBlock 490 40%
Standard 823
16 X 48 ProBlock 1174 18%
Standard 1431
32 X 48 ProBlock 914 24%
Standard 1209
48 X 48 ProBlock 827 27%
Standard 1135
48 X 72 ProBlock 719 30%
Standard 1032
72 X 72 ProBlock 704 31%
Standard 1020
12 inch Block 20' x 200' wall example
Grout
Spacing
Block
Type
Weight/
LF Decrease
Ungrouted ProBlock 558 52%
Standard 1168
16 X 48 ProBlock 1805 18%
Standard 2197
32 X 48 ProBlock 1312 28%
Standard 1813
48 X 48 ProBlock 1148 32%
Standard 1685
48 X 72 ProBlock 961 37%
Standard 1516
72 X 72 ProBlock 934 38%
Standard 1495
Horizontal Section Properties
8 in ProBlock
An (in2/ft) In (in4/ft) Sn (in3/ft) A avg (in2/ft) I avg (in
4/ft) S avg (in3/ft) r avg (in)
no grout 30 308.7 81.0 41.8 338.5 88.8 3.0
16 64.4 376.0 98.6 65.8 389.7 102.2 2.5
32 47.2 342.4 89.8 53.7 367.3 96.3 2.7
48 41.5 325.5 85.4 49.6 359.8 94.4 2.8
72 37.6 323.6 84.9 46.5 354.8 93.1 2.8
96 35.7 319.9 83.9 45.6 352.3 92.4 2.9
12 in ProBlock
An (in2/ft) In (in4/ft) Sn (in3/ft) A avg (in2/ft) I avg (in
4/ft) S avg (in3/ft) r avg (in)
no grout 30 811.2 212.8 43.4 939.0 246.3 4.7
16 91.2 1191.1 312.4 91.2 1266.2 332.1 3.7
32 60.6 1001.2 262.6 67.8 1120.5 293.9 4.1
48 50.4 906.2 237.7 59.5 1071.9 281.2 4.2
72 43.6 895.4 234.9 55.5 1039.5 272.7 4.3
96 40.2 874.5 229.4 51.3 1023.3 268.4 4.5
Vertical Section Properties
8 in A block
An (in2/ft) In (in4/ft) Sn (in3/ft) A avg (in2/ft) I avg (in
4/ft) S avg (in3/ft) r avg (in)
no grout 30 294.2 77.2 38.0 321.9 84.4 2.9
16 60.0 358.4 94.0 64.0 372.2 97.6 2.4
32 45.0 326.3 85.6 51.0 347.1 91.0 2.6
48 40.0 315.6 82.8 46.7 338.7 88.8 2.7
72 36.7 308.4 80.9 43.8 333.1 87.4 2.8
96 35.0 304.9 80.0 42.4 330.3 86.6 2.8
12 in A Block
An (in2/ft) In (in4/ft) Sn (in3/ft) A avg (in2/ft) I avg (in
4/ft) S avg (in3/ft) r avg (in)
no grout 30 774.0 203.0 44.0 894.3 234.6 4.5
16 91.2 1136.4 298.1 89.9 1196.6 313.9 3.6
32 60.6 955.2 250.5 67.0 1045.5 274.2 4.0
48 50.4 894.8 234.7 59.3 995.1 261.0 4.1
72 43.6 854.5 224.1 54.2 961.5 252.2 4.2
96 40.2 834.4 218.8 51.7 944.7 247.8 4.3
Fire Rating with ProBlock
In the absence of an E119 fire test on a
specific masonry unit design, fire ratings are
determined using the Equivalent thickness
method. Using the equivalent thickness
method for fire rating determination 8 inch
ProBlock has can achieve a 2 hour fire rating
using the “2 Hour” version and 90% or
greater by volume lightweight aggregate.
The following table shows the fire ratings
achieved by the equivalent thickness
method.
Fire Rating of ProBlock
ACI 216 Fire Rating Analysis
8 inch 12 inch
ProBlock
2 hour
ProBlock ProBlock
1.3 web
ProBlock
Equivalent Thickness (in)* 3.35 3.7 3.76 4.39
Aggregate composition Fire Rating Hours
100% ESCS 1.5 2 2 2.5
90% ES 10% NW 1.5 2 2 2.5
80% ES 20% NW 1 1.5 2 2.5
70% ES 30% NW 1 1.5 1.5 2.5
60% ES 40% NW 1 1.5 1.5 2.5
50% ES 50% NW 1 1.5 1.5 2
40% ES 60% NW 1 1.5 1.5 2
30% ES 70% NW 1 1.5 1.5 2
20% ES 80% NW 1 1.5 1.5 2
10% ES 90% NW 1 1.5 1.5 2
100% NW 1 1.5 1.5 2
Grout Use Comparison ProBlock Vs Regular Units
The ProBlock has one fewer web than regular
masonry units and is designed to easily go around
reinforcing steel. The ProBlock grouted cells will be
able to resist moisture penetration better than
regular grouted units. Open head joints can be a
primary source of water infiltration in masonry walls.
The ProBlock eliminates open head joints in grouted
cells, minimizing water infiltration.
Since the block has one fewer
webs it will take additional grout to
fill the grouted cells. The area of
the removed web and the area of
the head joint have to be filled
with grout. The amount of the
extra grout is small at typical grout
spacing. The following charts show
the grout required for a 20 foot
high 200 foot long wall with
various grout spacing.
The 12 inch ProBlock has
approximately 25 percent less
material than regular 12 inch
masonry units. The 12 inch
ProBlock has 1 ¼ inch face shells
and thinner webs. The amount of
grout required to fill in the 12 inch
ProBlock is higher than it is with
the 8 inch ProBlock, but the
extremely light weight and
associated production savings
along with the reduced water
infiltration potential make the 12
inch ProBlock the choice of
masons.
8 inch Block 20' x 200' wall example
Grout
Spacing
Block
Type
Grout
yd3
increase
yd3
additional
yd3 per
16 ProBlock 26.61
3.91 1150 Standard 22.69
32 ProBlock 13.30
1.96 2299 Standard 11.35
48 ProBlock 8.87
1.30 3449 Standard 7.56
64 ProBlock 6.65
0.98 4599 Standard 5.67
72 ProBlock 5.91
0.87 5741 Standard 5.04
12 inch Block 20' x 200' wall example
Grout
Spacing
Block
Type
Grout
yd3
Increase
yd3
Additional
yd3 per
16 ProBlock 49.59
10.89 413 Standard 38.69
32 ProBlock 24.79
5.45 826 Standard 19.35
48 ProBlock 16.53
3.63 1240 Standard 12.90
64 ProBlock 12.40
2.72 1653 Standard 9.67
72 ProBlock 11.02
2.42 1859 Standard 8.60
Since the open end of the ProBlock allows block to be placed around reinforcing steel and does
not require going over the steel, longer pieces of steel may be used. The net result of using
longer pieces of steel is steel reduction. The required length of lap or development is
determined according to the design procedure used (allowable stress design or strength
design). The length of the lap varies by code and design method, but the longer the individual
pieces of reinforcing you use the less steel you need to account for the required overlap.
The chart to the
right is for a 20 foot
high wall and
demonstrates the
reduction in
reinforcing steel
when using 8 and 12
foot sections steel
compared to using 4
foot spans. The 4 foot lift length of #5 steel used in the chart is 6 feet 2 inches due to the lap
length. These steel reductions can result in savings that offset a large portion of the additional
grout cost using ProBlock.
Linear Feet of Steel Comparison
Wall Length 200 Feet -Wall Height 20 Feet
Grout Spacing
(in) 16 48 96
Steel Lift(ft) 4 feet 8 feet Savings* 4 feet 8 feet Savings* 4 feet 8 feet Savings*
#4 4313 3656 $219
1438 1219 $73
719 609 $37
#5 4625 3813 $424
1542 1271 $141
771 635 $71
#6 5688 4344 $1,009
1896 1448 $336
948 724 $168
Steel cost $0.50 per pound
Wall Height 20 Feet
Steel Lift Length (ft)
4+ Lap 8+ Lap Reduction 12+ Lap Reduction
Bar
size
Lap Length
IBC 2006
#4 21.0 inches 28.8 24.4 15.2% 22.9 20.3%
#5 26.0 inches 30.8 25.4 17.6% 23.6 23.4%
#6 43.0 inches 37.9 29.0 23.6% 26.0 31.5%
STC
STC is roughly the decibel reduction in noise a partition can provide, abbreviated 'dB'. The dB
scale is a logarithmic one and the human ear perceives a 10dB reduction in sound as roughly
halving the volume - a 40 dB noise subjectively seems half as loud as a 50 dB one. If an 80dB
sound on one side of a wall/floor/ceiling is reduced to 50dB on the other side, that partition is
said to have an STC of 30.
The International Building Code contains requirements to regulate sound transmission through
interior partitions separating adjacent dwelling units and separating dwelling units from
adjacent public areas, such as hallways, corridors, stairs or service areas. Partitions serving the
above purposes must have a sound transmission class (STC) of at least 50 dB.
STC is calculated as 20.5 x W
0.234
The weight per ft2 of wall is the key factor that affects the STC rating of a wall. There are some
other factors which may affect the STC rating of a wall assembly as well and they are:
• ASTM E90 test results have shown that STC ratings improve by 4 dB when one (1) side of
Concrete Masonry Walls receives two (2) coats acrylic-latex paint (“Sound Transmission
Loss Through Concrete and Concrete Masonry Walls, Portland Cement Association,
1978.”)
• Foam Injection can add up to 6 dB (Citifoam Info Sheet)
For more information on STC ratings see NCMA TEK Note 13-1C (Sound Transmission Class for
Concrete Masonry Walls).
OITC is a standard used for indicating the rate of transmission of sound between outdoor and
indoor spaces in a structure. It is based on the ASTM E-1332 Standard Classification for the
Determination of Outdoor–Indoor Transmission Class.
8 Inch ProBlock
8 inch ProBlock
Grout
Spacing Block Type Weight/SF STC
STC w/
Paint
STC w/
Foam
STC w/
Foam and
paint OITC
Ungrouted ProBlock 24.5 43.3 47.3 49.3 53.3 37.2
Standard 41.2 48.9 52.9 54.9 58.9 43.2
12 Inch ProBlock
Grout
Spacing Block Type Weight/SF STC
STC w/
Paint
STC w/
Foam
STC w/
Foam and
paint OITC
Ungrouted ProBlock 27.9 44.7 48.7 50.7 54.7 38.6
Standard 58.4 53.1 57.1 59.1 63.1 47.8
The ProBlock Story
ProBlock is a patent pending concrete masonry unit designed and marketed by Johnson
Concrete Company. It is the final result of multiple collaborations between Johnson Concrete’s
engineers, block masons and architects. The designs genesis dates back to October 2010 when
Johnson Concrete hosted a meeting with masons and architects to discuss the future of
concrete masonry and what block producers could do to improve the market. From this
meeting Johnson Concrete took key points from the masons and architects and started working
on products to fit the needs of the industry.
The masons and architects highlighted the need for innovative masonry products that met the
following requirements:
Masons
1. It has to light, not just a little lighter but light enough to make a real difference
2. You have to be able to lift it with one hand in order to keep the production level up
3. It has to be well balanced and easy to lay for the mason in the field
Architects
1. It needs to be more energy efficient to deal with the new energy codes
2. It needs to offer design flexibility
3. It has to be cost competitive
4. It needs to shorten construction schedules
5. It has to meet fire rating requirements
The first few attempts Johnson Concrete made to create units that would fit these needs met
with only marginal success. Johnson Concrete created a 12 inch high Prodigy block and a 24
inch long Labor Saver. These units never took off because they did not address all the needs of
the masons or architects.
When the ASTM C90 standard changed from requiring 2 ¼ inches/foot minimum equivalent
web thickness to requiring 6.5 in2/ft2 normalized web area, Johnson Concrete saw the
opportunity to develop a product that could change the masonry industry. The design of
ProBlock was centered on the things we learned in those early meetings. We worked to
develop the lightest, most balanced easy to lay and best energy performance block possible.
Some other general industry concerns arose during the development stage of the ProBlock that
we addressed through engineering or trial and error. We had to have a block that:
1. Would be effective in partial grouted construction applications
2. That could be made easily and quickly on existing block machines
3. That would maintain dimensional tolerances through production
4. That was strong enough to make it to the jobsite without increased chips or cracks.
When the design work and testing was complete, the ProBlock was so much different than
anything else on the market we decided to apply for a patent on the product and promote it
throughout the United States.
The ProBlock is everything we set out to make it plus some. The weight is amazing low, it is
easy to make, easy to handle and lay in the wall. The R-value increases with the ProBlock
especially when used in conjunction with a material like Core Foam Masonry foam Insulation
are outstanding. Masons who have used the block have found tremendous production rate
increases and actively look for more opportunities to use it on their projects.
The ProBlock is backed by a strong technical support and engineering team. Johnson Concrete
is currently working on E119 fire testing and thermal measurements using the ProBlock to
better take advantage of the properties of the block. Johnson is committed to making ProBlock
the industry standard for high performance masonry wall systems.
The ProBlock offers benefits to everyone from the block producer to the mason to the
owner/architect. It is a great solution for energy, productivity, safety and profitability.
