Damp Surveys

🔎 10 Steps to Find, Fix & Test Root Cause(s) of Damp
Sources: Rain, Leaks, Condensation, Groundwater + Multi

1️⃣ Consider changes

2️⃣ Symptoms
🔹 Base of wall? → Leak, rainwater, condensation
🔹 Brown stain? → Dark ceiling stain = leak, Light wall stain = rainwater, None = condensation/salts
🔹 Colorless? → Condensation/ Hygroscopic salts
🔹 White salts? → evaporation-condensation, harmless
🔹 Mold? → Excess vapor

3️⃣ External wall
🔹 Inspect gutters, pipework etc. & ground level

4️⃣ Internal wall
🔹 Look for leaks

5️⃣ Leaks? Leak test/ CCTV

6️⃣ Hygroscopic Salts (Chimney/ 1M Band) Not a Source, Harmless

7️⃣ Condensation (Most Common 85% → Default Cause)
🔹 Reduce/remove moisture, lower the dew point
🔹 Use an anemometer, check exhaust ducts, use data loggers

8️⃣ Damp Basement, Subfloor
🔹 Measure vapor/ airflow
🔹 Check for leak/ rot

9️⃣ Rising Damp (Unlikely, Can Be Proven)

🔟 Damp-Proofing? 🚫 Masks Damp, Increases Risk of Rot, Mold..

Test Fixes: Data Loggers & Damp Meter (6+ months)