Custom Crete manufactures a uniquely sized "Beam" Brick, which has been succesfully used in RDP house construction.
The Beam Bricks are designed to be used with M140 block houses. The Beam bricks are sized to be used as a beam filling to easily create a cost effective "seal" between the roof and the top row of blocks.
The Beam brick can also be used as a method to create a roof brandering placement and locking mechanism.
The Beam Brick can also be used as a 60mm paving brick