🎥 Damp Mystery Solved? 🧩 Gutter Leak & Condensation 🌧️💨 скачать в хорошем качестве

🎥 Damp Mystery Solved? 🧩 Gutter Leak & Condensation 🌧️💨

0:00 – Intro: root cause vs damp-proofing 0:20 – Wall dampness explained: brown staining & gravity 0:55 – Source identified: rainwater & 14-year history 1:30 – Plant growth confirms ongoing moisture 1:50 – Faulty cast iron gutter & moss blockage 2:40 – Overflow due to partial moss blockage 3:00 – Recommendation: gutter replacement 3:30 – Separate internal issue at wall base 3:55 – Vapour source in bathroom & floor heat loss 4:25 – Bathroom extractor fan underperforming 4:50 – Backdraft shutter jammed, minor airflow improvement 5:20 – Continuous flow fan recommended 5:45 – Additional bathroom suggestions (door, insulation) 6:15 – Kitchen lacks proper extractor, vapour spreads 6:45 – Clothes drying & need for dehumidifier 7:10 – Dehumidifier capacity calculations 7:20 – Thermal imaging and data logger section 7:50 – Data logger issues and explanation 8:45 – Dew point explanation & ventilation advice 9:50 – Summary: compound damp, vapour and penetrating damp 🧾 CONCLUSION This ground-floor flat shows two distinct sources of damp, each with a different root cause: 1. Penetrating damp from the external wall is still active, evidenced by brown staining, crumbling plaster, and elevated moisture readings. The leaking and partially blocked gutter, which drains a large surface area from multiple roofs, has been allowing water to overflow down the wall. This has supported moss growth and even plant life, confirming persistent water ingress. Although I cleared a large obstruction and improved flow, the cracked pipe section still requires permanent repair. 2. Condensation and excess vapour are the likely source of damp on the internal wall shared with the bathroom. A slow leak from a poorly sealed cistern and poor ventilation appear to have created conditions for condensation to form and persist. The wall shows flaking paint just above the skirting board, a typical sign of condensation. This is made worse by: • Internal clothes drying, • Inadequate bathroom extraction (fan backdraft shutter was stuck and airflow was ~20% of ideal - now better @ ~50% of ideal), • A missing kitchen door, allowing vapour to spread, • A radiator-pipe thermal bridge potentially cooling the bathroom-adjacent wall. In short, penetrating damp from outside and excess vapour from within are working together — a classic compound damp scenario. The external source may have caused initial damage, but continued indoor vapour makes drying difficult. ⸻ 🔧 RECOMMENDED ACTIONS 1. Fix the leaking guttering: Replace or repair the cracked cast iron/plastic joint to prevent rainwater from overflowing. Use a temporary mastic patch if needed short-term. 2. Clear moss and vegetation regularly: These indicate retained moisture and will reappear unless the gutter is properly maintained. 3. Upgrade bathroom extraction: • Replace current fan with a continuous flow extractor with a boost function - e.g. VentAxia @ Screwfix. • Ensure cold pipes properly insulated to prevent condensation on cold surfaces (pipe insulation such as from B&Q). 4. Install a spring hinge on the bathroom door: To help vapour stay contained and get extracted, rather than drifting into the bedroom. 5. Use a 20-litre/day dehumidifier: Especially when drying clothes. Set it to 60% relative humidity when at home and 70% when away, and place wherever vapour is highest (highest dew point on data loggers) or where the walls are dampest. When away place it on a drain like a sink edge, draining into the sink. 6. Install or use a ducted kitchen extractor fan: Preferably externally vented. Until then, cook with lids on pots and reduce boiling/simmering where possible. 7. Monitor dew point using data loggers: Keep the internal dew point below the external temperature to avoid condensation. Use https://damp.ai/detect to visualise results. 8. Fill in missing brickwork in kitchen wall: To reduce localised heat loss and condensation risk. 9. Repaint only after damp dries fully: Allow 6–9 months for drying before decorating. Use a Dr Damp Moisture meter to monitor improvements. 10. Keep skirting board areas ventilated: Avoid pushing furniture tight against cold walls.