Abstract: A drywall construction simulates a mortared block or brick wall construction by the use of simulated horizontal mortar layer inserts between the layers of building blocks and vertical inserts between abutting end surfaces of blocks in each layer, the horizontal layer insert being in the form of a belt, the belt layer being substantially non-compressible and the vertical inserts being provided with parts which extend across the space between abutting block surfaces of a wall construction and into slots provided in the abutting surfaces to secure interconnection and alignment of block ends and simulate vertical mortar inserts between vertical and abutting surfaces, the inserts may be provided with flanges or protrusions which cooperate with holes or grooves in underlying or overlying belt layers to secure the inserts, and the block surfaces, cooperating therewith, against lateral movement with respect to the layers, the belts or both.