Findings:
During our detailed inspection, several significant issues were identified:
1. Penetrating Damp: This was primarily attributed to damaged lead flashing around the chimney stack. The compromised flashing has allowed water ingress, resulting in damp and salt-contaminated plaster internally.
2. Rising Damp: Clear evidence of rising damp was observed on the rear external wall. The current bitumen damp proof course had deteriorated, leading to moisture absorption from the ground.
3. Rotten Timber: We discovered rotten joist ends where they entered the rear external wall, a consequence of prolonged damp exposure. This has potentially compromised the structural integrity in those areas.
Remedial Measures:
1. Lead Flashing Repair: The damaged lead flashing around the chimney stack will be replaced to prevent further water ingress. This will involve resealing and fortifying the chimney area to ensure durability against adverse weather conditions.
2. Damp Proof Course (DPC) Installation: To address the rising damp, a new chemical DPC will be installed along the affected walls. This modern solution will replace the failed bitumen layer and provide a barrier against ground moisture.
3. Joist Repair and Replacement: The rotten joist ends will be cut out, and new treated timber will be spliced or replaced as necessary. Additionally, improved ventilation measures will be implemented to prevent future timber decay.
4. Internal Plaster Replacement: Salt-contaminated plaster will be removed and replaced with a suitable damp-resistant plaster system to prevent recurring issues.