Abstract: An integrally formed insulating insert unit made from insulating material for insertion into a building block cavity and having a main body having a length and depth substantially equal to the respective length and depth dimensions of the block cavity and provided with an upwardly-extending capping flange integrally formed with the top of the main body, a top capping flange integrally formed with the top of the main body and extending thereabove and extending longitudinally outwardly beyond at least one of the upstanding side edges of the body to overlie in sealing engagement the adjacent top web surface of the block and being of sufficient length and thickness and being sufficiently yieldable to produce a vertically and horizontally continuous insulating barrier within a multiple layer masonry block wall section.

Abstract: A building block having hollow cores therein with rigid insulating core panels inserted into each of the core cavities and having insulation sealing cap elements overlying said core panels and extending beyond the ends of the cores to overlie the masonry web portions formed between adjacent cavities and thereby form a continuous insulating sealing strip extending the full length of a block wall.