Thinking about using Omni, Hi R, or Korfil? They have connecting webs
that can substantially reduce energy efficiency because of their thermal bridging.
Here is what the experts at the Office of Energy Efficiency and Renewable Energy of the US Department of Energy say:
"The better concrete masonry units reduce the area of connecting webs as much as possible... Field studies and computer simulations have shown that core-filling of any type offers little fuel savings since the majority of heat is conducted through the solid parts of the walls such as block webs and mortar joints."
Unlike Omni and Hi-R, NRG Insulated Block has zero connecting webs.
In fact, NRG is the only reinforceable block that meets the ASHRAE definition of
continuous insulation (ci):
" insulation that is continuous across all structural members without thermal bridges other than fasteners and service openings. It is installed on the interior, exterior, or is integral to any opaque surface of the building envelope."
In any comparison between NRG and other insulated block, it is important to
remember that effective R-value, and not steady state R-value, is the more
accurate measure of a wall's thermal performance, even though you cannot use the effective R-value in Com-check and Res-check programs.
NRG's effective R-value of R-22 gives you an indication of how well the block can perform in the field, as effective R-value takes into consideration seasonal and diurnal temperature swings. Steady-state R value is a test of resistance to heat transfer under laboratory conditions.
In climate zones 5 and 6, using actual utility bills as a reference, NRG has been shown to thermally outperform energy models of buildings built to LEED
3.0 standards with R-53 walls.
Structurally, NRG meets all the requirements for safe building design.