Insulated concrete masonry unit with low density heat bridges

In a concrete masonry unit comprising a first load-bearing side wall attached to first and second load-bearing end walls in a perpendicular relationship, and a second load-bearing side wall attached to said first and second load-bearing end walls in a perpendicular relationship thereby forming at least one central core, said concrete masonry unit further comprising a first outer side wall attached to first and second outer end walls in a perpendicular relationship, said first outer end wall attached to said first load-bearing end wall, said second outer end wall attached to said second load-bearing end wall, said first outer side wall being in a parallel relationship with said first load-bearing side wall thereby forming a first insulation core, and said concrete masonry unit having a composition of a uniform concrete masonry material, prepared by the process comprising the steps of:

• (a) forming a mixture of aggregate, concrete and water,
• (b) agitating the mixture of step (a) thereby incorporating air into the mixture,
• (c) placing the agitated mixture of step (b) into a mold box, said mold box adapted to produce said concrete masonry unit,
• (d) compacting said agitated mixture of step (b) in said mold box of step (c),
• (e) removing the product of step (d) from said mold box, and
• (f) drying said product of step (e);
• the improvement comprising having said outer end walls of minimal size, and not compacting said outer end walls whereby said outer end walls have a significantly lower density than said load-bearing walls and said outer side wall, said lower density caused by a greater amount of air being present in the concrete masonry material, whereby the rate of heat transfer from said outer side wall to said load-bearing walls is reduced, and said concrete masonry unit is of superior insulative value.