N-R-G Foam has installed Core-Fill 500 into hundreds of condominiums, town houses, custom homes and assisted living facilities throughout the Southwest.

Core-Fill 500 Foam Insulation is an excellent choice for the insulation of a block home. The R-Value for the block alone can be as high as Twenty Four. As part of a complete wall insulation system, Core-Fill 500 will help achieve the highest possible R-Values for your wall.


Buildings with shared interior walls can be insulated by Core-Fill 500 to provide excellent sound absorption. This product is a great use for the common walls in condos, duplexes, and apartments as well.

Very high R-Values can be achieved by using Open-Ended “H” block.  By reducing the thermal bridging by 2/3, an 8” open-ended CMU can achieve an R23.35, and an open-ended 12” CMU will get an R37.

When the interior walls are insulated, less noise is transferred through the wall. The STC Rating of a CMU wall can be as high as 60. A wall completely filled with sand has a STC rating of approximately 53.


Core-Fill 500 can be retrofitted into any existing block structure. Core-fill 500 fills the cavities completely and seals all air penetrations.  It also helps to keep rodents and insects out, and helps maintain a stable environment inside the structure.


Installation of Core-Fill 500 is fast and efficient, thanks to our experienced and certified crews. The product is installed through a series of 5/8″ holes drilled into a mortar joint. The material is pumped under pressure into the walls’ cavities, and it flows Vertically, Horizontally, and Diagonally as it seeks and fills all voids within the wall.  After job completion, the holes are then patched and left ready for paint or other finish.

Another house in Scottsdale, this one was a little different. All of the walls had been sandblasted to expose the aggregate of the block. We drilled the holes at different elevations, and washed the walls as we went so that the material would not be soaked into the block’s surface.