For extreme loads on weirs, overflow edges of reservoirs, locks and other waterworks, we use Vápenice granite, which fully meets the requirements of ČSN EN 13383–1, ČSN EN 1469, ČSN EN 1341, ČSN EN 1467, ČSN EN 1468 and previous standards ČSN 721810, ČSN 721820, ČSN 721860 and former industry standards.