7Cooney, Gabriel. "Dowth Passage Tomb." Archaeology Ireland 11.3 (1997): 18.
Coffey reported that "The present chamber roof is of concrete and is noticeably less successful at keeping out the rainwater than the Newgrange roof built about 5000 years ago." (O'Kelly, M.J., Claire O'Kelly, V.R. O'Sullivan, and R.H. Frith. "The Tumulus of Dowth, County Meath." Proceedings of the Royal Irish Academy 83C (1983): 148-56.)