TEMPERATURE GOES VERY HIGH IN THE SUMMERS AND LOW IN THE WINTER.  THIS TEMPERATURE SWING OR DELTA 'T'  CAUSES THE REINFORCED CONCRETE SLAB TO EXPAND AND CONTRACT . ALSO HUMIDITY AND RAIN CONDITIONS VARY EVERY YEAR. HEAVY RAINS AND DRY SUMMERS. THESE CHANGES IN TEMPERATURE, PRESSURE AND HUMIDITY CONDITIONS CAUSES CRACKS IN CONCRETE AND RCC SLABS

BITUMEN BOARD COMPRESSES UNDER THE PRESSURE AND EXPANDS BACK QUICKLY  TO ITS ORIGINAL SHAPE SHOWING GOOD ELASTIC PROPERTY.  THUS PREVENTING THE CONCRETE FROM CRACKING