An architect specified another insulated block and NRG block as an alternate on a project with 75,000 sq ft of wall.
The other insulated block (top left and top right pictures) delivers over 150,000 thermal bridges (two bridges per block) on the project.
NRG (bottom left and bottom right pictures) on the same project would deliver zero thermal bridges.
That's an enormous difference.
The problem? When masons bid on two alternate materials, they just bid the lowest price material, not the most valuable.
In this case, the mason bid the other block, which was about a dollar less than NRG.
Yet, NRG would provide more payback to the building owner over the life of the building.
Question: Did the owner know this?
The end result? 150,000 energy escape routes, instead of zero energy escape routes. The owner loses, and the environment loses, for the life of the building.
Solution: Architects and engineers can educate owners and developers.
Other insulated block, with thermal bridges, should never be considered as an equal or alternate to an NRG block, with its zero thermal bridges.