⁵Ua Danachair, Caoimhghín. "Some Primitive Structures Used as Dwellings." The Journal of the Royal Society of Antiquaries of Ireland 75.4 (1945): 210-12.
While some of the chocháin have been stabilized with mortar, or have even been roofed with concrete, this does not always bode well for their survival. "One old gentleman complained bitterly of these innovations and pointed out a clochán, on his property, which fell in shortly after being capped with concrete, as the extra weight was too much for the old stonework to bear." There are still dry-stone clocháin being built today.