A building block arrangement comprises a first layer of building blocks and a second layer of building blocks. The first layer of building blocks includes two spaced apart rows of building blocks whereby a space is provided between adjacent side faces of the building blocks of the first layer. The second layer of building blocks includes two spaced apart rows of building blocks whereby a space is provided between adjacent side faces of the building blocks of the second layer. The space includes communicative horizontal and vertical portions such that that the space at least partially isolates an interior wall portion from an exterior wall portion. The second layer of building blocks is positioned on top of the first layer of building blocks. The second layer of building blocks spans across at least a portion of the space in the first layer of building blocks.