Building block with insulating core

A block for a building wall, the block having spaced apart parallel face shells and an insulating core defining spaced apart parallel outer and inner surfaces each engaging a respective one of the face shells, the insulating core including male interlocking members protruding from the outer and inner surfaces and received in complementary female interlocking members defined in the face shells, the insulating core including a metal connecting bar with lateral wings provided within at least one of the male interlocking members such that a thermal break is provided between the connecting bar and the face shells.

A method of preparing a structural insulating wall for buildings comprising the steps of manufacturing discrete interlocking building blocks each having face shells parallel and spaced apart with an insulating core therebetween, forming first and second intersecting channels within each core;

• assembling the wall with the discrete blocks while aligning the first channels to form vertical passageways and the second channels to form horizontal passageways in the wall, passing reinforcing rods and pouring grout through selected ones of the passageways while leaving other ones of the passageways void.