Perhaps you would prefer to have a nicer finish to your storage box in the shape of a roof. This mould produces perfect accompanying ridged blocks which fit on the blocks made with the 150x60x60 mould. This mould has 10 holes along the bottom, so that it fits perfectly over the standard blocks.
In addition to a nicer finish to your walls, the roof model also has a practical function; used with storage boxes it creates a tapered ridge on internal walls, ensuring that raw and other materials slide neatly into the storage box without becoming mixed. Furthermore no sand remains on the upper blocks.