NRG Insulated Masonry Units

Architectural Masonry / NRG Insulated Masonry Units


1. What is the R-Value of a NRG Block?
For a normal weight block (125/ft3), the equivalent R-Value is 20 and 22 respectively, for 10″ and 12″ blocks.

2. How do these R-Values relate to building codes in both residential and commercial projects?
Most residential building codes require a minimum of R-11 in the basement and R-19 in sidewalls. Most commercial codes address the energy efficiency of the building as a whole. This is known as the envelope. NRG Block’s higher R-Value allows for trade offs, such as more windows or skylights.

3. How does the R-Value of NRG Block compare to common block?
A NRG Block is higher in R-Value than a standard masonry block, which ranges from 1.5 to 2.5 depending upon the aggregate used.

4. How does the R-Value compare to other insulated block?
Other block using inserts or hollow core block with poured insulation range between R-4 and R-6 for a 10″ block and between R-6 and R-8 for a 12″ block, depending on the density.

5. Is there any toxic material in the inserts?
No. It is non-toxic and contains no formaldehyde. Expanded polystyrene is the same substance used in Styrofoam coffee cups. Chlorofluorocarbons are not used in its production.

6. What is the percentage of recycled material in your inserts?
The Expanded Polystyrene inserts may contain 10-15% pre-consumer recycled content. In addition, the masonry unit may also contain recycled aggregate content.

7. Is this a structural block?
Yes, tests show that NRG Blocks meet or exceed the minimum standards set by ASTM C90.

8. Can the block be used as a backup block for brick veneer?
Yes, a face brick veneer with an air cavity of 1″ to 4″ will increase the R-Value to 21.4 for a 10 ” NRG wall.

9. Can NRG Block be used for single width applications?
Yes, NRG’s superior design allows for a cost-effective way to build with single wythe construction, yet double wythe benefits.

10. What size NRG Blocks are available?
Currently nominal 10″ and 12″ widths, by 8″ high and 16″ long.

11. Does NRG only come in common block or are architectural styles available?
NRG block is available in the many colors and architectural finishes.

East Coast Customers should contact Anchor, an Oldcastle Company at: 732-292-2674
1-800- 682-5625
for samples

Midwestern Customers should contact Northfield, an Oldcastle Company at: 1-800-358-3003
for samples and selection.

12. What do you do for specialty block such as corners and halves?
The NRG block should not be cut in half. Corner units can either be a standard 8″ cmu or a solid 4″ with an 8″ return corner (L shaped block). Both would be made in the color and finish to match the specified NRG block.

13. Can this block be used in a firewall?
Yes, 10″ NRG walls and 12″ NRG walls are both rated at four (4) hours.

14. Can this block be used in both below-grade and above-grade applications?
Yes, below-grade applications often must use both horizontal and vertical reinforcement depending on the size of the block used and the soil conditions and code requirements in a particular area. NRG Block can accommodate most of these situations.

15. How much does this block cost as compared to regular block?
Compared to un-insulated common blocks, NRG Block generally costs $4.00 to $4.50 more per block. However, on a Cost/Sq.Ft./R-Value, NRG Block overall costs less.

16. How does this block compare in cost with other insulated block on the market?
Most insulations add about $1.00 or more to the cost of an un-insulated block. Considering the much higher R-Value (R-20 as compared to R-8), the NRG block pays for itself in no time.

17. What type of energy dollar savings can I realize over a year?
It varies from building to building, but NRG was used in a 6800 square feet convenience store in Genesee, PA, where it is hot in summer and cold in the winter. The monthly average HVAC utility bill in 2009 was less than $200/ month, or about $.31 annually.

Another case, outside of Buffalo NY, is Ridgewood Bible Church, where the local  gas provider delivered a preconstruction estimate of a monthly heating bill of about $2000 per month for the 38,000 sq ft addition built with NRG block. They have not had a bill over $565/month, saving about $1500 per month.

18. Compared to non-masonry, where can I pick up savings in using this type of wall system?
NRG Block, like all masonry material, has high Thermal Mass and Heat Capacity, as well as Thermal Lag, all of which allow specification of smaller and less expensive heating and cooling units. Annual fire insurance premiums may also be lower by as much as 60% with masonry construction.

19. What is the NRG Block wall system STC sound rating?
The 12 ” block has a Sound Transmission Class (STC) of 55. We estimate that the 10″ block has an STC of 53 based on a direct interpolation.

20. Are the test results for the block available?
Yes, the test results are available. Please contact Anchor, an Oldcastle Company for test results.

21. Where is the block made?
NRG Licensed block manufacturers produce and service a regional area. Licensees distribute the blocks through normal channels, such as dealers and building and masonry contractors.

22. How do you handle this block?
Handling is a matter of preference. After a short learning curve (3-4 hours), masons are comfortable handling the block. The thumbholes should be used and the laborer should always present the block with the same orientation to facilitate bundling.

23. Will the mason’s charge a premium to put this block in?
Our experience is that the range of up-charges are from 0 to 10%.

24. Does NRG Block lay-up slower than ordinary block?
The up-charge would indicate that the masons expect up to a 10% fall-off in production. However, we have observed that such a fall-off occurs during the learning curve phase, but approaches zero as they continue to lay-up the block.

25. Are there provisions for horizontal and vertical reinforcing?
Yes, this unit can be horizontally and vertically reinforced.

26. How do you handle electrical outlet requirements?
Much the same way we handle vertical reinforcing. Additionally, surface-mount and baseboard electrical chases can be used where applicable.