These are commentaries on a Cochrane review, published in the issue of EBCH, first published as: Sauni R, Uitti J, Jauhiainen M, Kreiss K, Sigsgaard T, Verbeek JH. Remediating buildings damaged by dampness and mould for preventing or reducing respiratory tract symptoms, infections and asthma. Cochrane Database of Systematic Reviews 2011, Issue 9. Art. No.: CD007897. DOI: 10.1002/14651858.CD007897.pub2.