Water damage in buildings, caravans & motorhomes – detect early and measure moisture the right way

Water damage is one of the most costly (and often underestimated) problems in both buildings and leisure vehicles. The challenge is that moisture can remain hidden inside walls, ceilings, insulation or wooden structures for a long time—until odors, material softening, mold, or visible stains appear. That’s why early, structured moisture measurement is key.

1) Typical sources of moisture

In buildings, common causes include:

• plumbing leaks, failing sealants, defective joints

• roof and flashing issues, balcony connections, cracked façades

• basement/foundation ingress

• condensation from thermal bridges and poor ventilation

In caravans and motorhomes, typical entry points are:

• roof hatches, window seals, seams and trims

• cable/pipe penetrations (solar, antennas, awnings)

• underfloor and wheel arch areas (spray water)

• condensation (especially in colder seasons)

2) Why measuring material moisture matters

A visual inspection is helpful, but hidden moisture often spreads beyond visible signs. Measuring allows you to:

• locate moisture “hotspots” and leak paths,

• document the extent of damage (useful for workshops/insurance),

• track drying progress over time.

After a leak, acting fast is crucial—many guidelines recommend drying wet areas/materials within 24–48 hours as a practical benchmark to reduce mold risk.

3) A practical measurement routine

1. Take a dry reference reading in a safe, dry area.

2. Measure in a grid pattern around suspect zones.

3. Focus on edges, frames, corners, penetrations and transitions.

4. Use different measurement depths to distinguish surface moisture from deeper moisture.

5. Document readings with photos and dates.

4) Recommended moisture meters – and the differences

A) For buildings, walls/ceilings & quick surveys: PeakTech 5201 (damage-free, up to 40 mm depth)

Product link: PeakTech 5201 Material Moisture Meter

Why it’s useful

• Non-destructive measurement with a metal sensor

• 20–40 mm measurement depth

• Easy evaluation via Dry / Risk / Wet, plus hold and auto power-off

• Designed for common building materials (plaster, gypsum, masonry) and wood

B) For renovation and multi-material work: GMK100 (capacitive, % display, 2 depths)

Product link: GMK100 Capacitive Moisture Meter

Why it’s useful

• Capacitive, non-destructive measurement with direct % moisture display

• Material characteristics/curves for wood and building materials

• Two depths (10 mm / 25 mm) for better interpretation of surface vs deeper moisture

C) For caravans, motorhomes & boats: GMK 210 (capacitive + search mode, wood & GRP/GFK)

Product link: GMK 210 Moisture Meter for Caravans and Boats

Why it’s useful

• Optimized for wood and GRP/GFK (common in leisure vehicle structures)

• Search mode helps you scan quickly and find moisture pockets

• Two depths (10 mm / 25 mm); can display material moisture u or water content w depending on your use case

5) Quick decision guide