SUPERSEDED BY GG33 2015 EDITION
It goes without saying that cavity walls should be built so that the inner leaf stays dry. Many building details are designed with this express purpose and are long-established. However, dampness is still a common problem in modern buildings, due to faulty design or construction of damp-proofing measures or to wrong choice of material. This Guide shows how to make sure new cavity walls do not suffer from dampness problems. 6 pages.