Gwynne Anthony 2020

ART506 Dissertation 2019. Anthony Gwynne . 36 4.2 Approved Document C Approved Document C is for site preparation and resistance to contaminates and moisture. It provides practical guidance in the form of 15 diagrams, four tables and text over 72 pages on how floors, walls and roofs can be constructed to resist the passage of moisture into the building using impermeable water- resistant defenses. Diagrams and details are given for the construction of modern cavity and solid walls, use of cement-based mortars, renders, and plasters, construction of concrete floors, installation of damp- proof courses, membranes and waterproof tanking etc. Diagrams illustrating potential problems from Approved Document C are reproduced in Figures 10 and 11 . A copy of Approved Document C can be downloaded free of charge at: (https://gov.wales/buildingregulations-approved- documents) . Extracts of modern ground floor details contained in ADC and reproduced in Figure 10 are designed to prevent the ingress of moisture into the building and can trap moisture below the damp proof membrane, concrete slab and non-vapour permeable insulations. Any trapped moisture/water will be pushed towards the external walls. this could lead to the build-up of excessive moisture in solid walls without a damp-proof course that many traditional buildings built before 1919 do not have, causing rising damp and the ingress of moisture into the building ( Figure 5). This could cause deterioration of the building fabric and lead to mould growth on the wall finishes, producing mould spours hazardous to the health of the occupants (King and Weeks. 2016).