Gwynne Anthony 2020

ART506 Dissertation 2019. Anthony Gwynne . 38 • Creation of new thermal bridge/condensation points behind highly insulated layers and interstitial condensation; • Rot and/or insect attack on structural timbers; • Frost damage within walls; • Failure of internal surface finishes. ` Figure 11: Extract of insulated external wall diagram in Approved Document C and how they trap water/condensation (Source: www.gov.wales/buildingregulations-approved-documents) . The extract in Figure 12 below illustrates the guidance provided by the Welsh Government for traditional and historic buildings is very limited, generic in nature and does not provide any practical advice for common situations, unlike that provided for modern forms of construction. MTttt Damp/condensation is trapped inside the cavity of impermeable internal wall insulation/ finishes Fini MTttt Damp/condensation is trapped against impermeable Ins insulation and is pushed internally wall R Rain MTttt Key: Damp