By the end of the eighteenth century, cast-iron casements were commonly used throughout Wales in industrial and agricultural buildings, churches and cottages.
Erbyn diwedd y ddeunawfed ganrif, defnyddiwyd casmentau haearn bwrw yn gyffredin ledled Cymru mewn adeiladau diwydiannol ac amaethyddol, eglwysi a bythynnod.