What moisture reading is too high? It depends on the material, meter type, settings and a comparable dry reference. For timber framing before lining, current BRANZ guidance says 18% maximum in insulated buildings and 24% in non-insulated buildings; follow the relevant project documents and lining manufacturer’s requirements.
Moisture content versus relative readings
| Reading type | Most useful for | How to use it |
|---|---|---|
| Moisture content percentage | Timber, using an appropriate pin meter setting | Compare against the material requirement and repeat in comparable locations |
| Relative scale | Plasterboard, concrete and many pinless checks | Compare a suspected area with a dry area of the same material |
Timber framing before lining
BRANZ explains that the Building Code Acceptable Solution E2/AS1 limits framing to 18% in insulated buildings before lining is installed and 24% in non-insulated buildings. Timber species, temperature, meter settings, metal fixings and where the reading is taken can affect results. See the BRANZ timber guidance and project-specific requirements.
Illustrative scenario: compare, do not guess
Illustrative scenario, not a customer result. After a stopped bathroom leak, a lower wall gives a higher relative meter response than a dry section of the same wall. This supports further assessment of the affected zone, but it does not prove how long drying will take or whether moisture is hidden elsewhere.
How to obtain comparable readings
- Use the meter’s correct mode and material setting where applicable.
- Choose a dry reference area of the same material and similar location.
- Test accessible locations away from obvious metal fixings where possible.
- Record the location, material, meter mode and result; repeat consistently over time.
When readings mean more than drying is needed
- Readings rise or the water source is active: contact a qualified plumber.
- There are roof, cladding or structural concerns: consult an appropriate independent building professional.
- Water is contaminated, electrical hazards exist or spread is uncertain: use an assessment-led restoration approach.
For a suitable contained clean-water event, see thermal imaging and moisture checks with Drying Combo hire, our pre-line timber-frame checklist and how to check that carpet and walls are dry.
Frequently asked questions
What moisture content is required for timber before lining?
BRANZ cites 18% maximum for framing in insulated buildings and 24% in non-insulated buildings before lining. Project and manufacturer requirements may be lower.
Can a moisture meter find a leak source?
No. It can help identify where accessible materials appear wetter than a comparison area, but a qualified plumber should locate and repair the source.
Is moisture testing included with Dry Me Now hire?
A moisture meter and practical thermal image assessment are included where suitable with Drying Combo hire. The check supports drying decisions and is not a stand-alone building report.