Using UNI-T UT377C to Check Walls and Wood After Flooding Malaysia
After a flood or serious water intrusion, walls and wooden materials may remain damp even when the visible surface appears dry.
The UNI-T UT377C Pinless Moisture Meter helps restoration teams, contractors and property owners compare moisture conditions without puncturing walls, flooring or furniture. It can support preliminary assessment and drying-progress checks after floodwater has been removed.
Why Check After the Surface Looks Dry?
Water can remain trapped inside:
Drywall partitions
Plastered walls
Wooden flooring
Cabinets and furniture
Skirting boards
Door frames
Wall cavities
Materials below floor finishes
Painting, closing the wall or reinstalling furniture too early may trap moisture and contribute to further material deterioration.
A visual inspection alone may not reveal the full affected area.
Prioritise Safety Before Testing
Do not begin moisture testing until the area is safe to enter.
Before inspection:
Disconnect electricity where required
Have electrical systems checked if exposed to water
Avoid unstable ceilings or walls
Wear suitable personal protective equipment
Do not handle contaminated materials without proper protection
Follow the instructions of emergency or restoration professionals
The UT377C is an inspection instrument and is not designed for use in standing water.
Identify the Highest Water Level
Look for evidence showing how high the water reached:
Dirt or sediment lines
Paint discolouration
Swollen wall panels
Damaged skirting
Marks on furniture
Loose wallpaper
Softened plaster
Visible mould or staining
Mark the approximate flood line before cleaning removes all visible evidence.
Then scan above and below this level to determine whether the moisture condition extends further than expected.
Select the Correct Measurement Mode
The UT377C provides four modes:
Softwood
Hardwood
Drywall
Masonry
Use Drywall mode for gypsum-board partitions.
Use Masonry mode for brick, concrete and cement-plastered walls.
Use Softwood or Hardwood mode for suitable timber components, furniture and wooden flooring.
Keeping the same mode throughout each material inspection is essential for meaningful comparison.
Establish an Unaffected Reference Area
If possible, locate a section made from the same material that was not exposed to floodwater.
Take several measurements from that area to establish a reference condition.
Then compare readings from:
The visible flood line
Areas below the flood line
Areas above the flood line
Corners and wall joints
Sections behind cabinets
Wooden frames and skirting
Adjacent rooms
Drywall and masonry results are relative values, not absolute moisture percentages.
Create a Moisture Map
Inspect the affected space using a regular grid pattern.
For example:
Divide the wall into measurement sections.
Begin near the floor.
Measure at regular height intervals.
Continue above the visible flood line.
Mark each reading on a sketch or photograph.
Repeat the inspection after drying begins.
A moisture map helps users monitor whether the affected area is becoming smaller over time.
Checking Drywall After Flooding
Flood-exposed drywall may:
Absorb water into the board
Swell or soften
Lose structural integrity
Separate from surface paper
Develop staining
Remain wet inside the wall cavity
A high relative reading helps identify areas requiring closer inspection, but the meter cannot determine whether the board remains structurally suitable.
Severely damaged or contaminated drywall may need to be removed according to the restoration plan.
Checking Masonry Walls
Brick and concrete may retain moisture for a longer period, especially when ventilation is poor.
Use Masonry mode to compare:
Lower and upper wall sections
Internal and external-facing walls
Areas near floor joints
Corners with limited airflow
Sections covered by cabinets or furniture
Changes in plaster thickness, reinforcement or concealed pipes can influence the readings.
Look for a consistent pattern rather than relying on one measurement.
Checking Wooden Flooring and Furniture
Wooden materials may expand, warp or separate after water exposure.
Check:
Flooring near entrances
Boards beside walls
Skirting and door frames
Cabinet bases
Furniture legs
Wooden panels
Items stored directly on the floor
The UT377C measures wood within a range of 4%–32% and can inspect without leaving pinholes.
For thick, layered or engineered products, the reading may be influenced by adhesives and underlying materials.
Monitor Drying Progress
Record the initial readings before drying begins.
Repeat measurements using:
The same instrument
The same measurement mode
The same marked locations
Similar sensor orientation
The same reference area
Readings should be reviewed as a trend.
A gradual reduction may indicate that drying is progressing. Readings that remain high may suggest trapped moisture, limited ventilation or continued water entry.
Do Not Rely on One Reading
Moisture-meter results may be influenced by:
Metal pipes
Electrical wiring
Reinforcement bars
Screws and fasteners
Different material densities
Surface coatings
Adhesive layers
Salt and contamination
Materials behind thin surfaces
Confirm unusual readings by measuring nearby points.
For professional restoration, additional equipment such as thermal imaging cameras, air movers, dehumidifiers and material-specific testing methods may be required.
When Further Professional Assessment Is Needed
Seek specialist assistance when:
Walls remain soft or unstable
Electrical systems were submerged
Contaminated floodwater entered the property
Mould growth is extensive
Wooden flooring continues lifting
Moisture readings remain high
Structural materials are affected
Water continues entering the building
Insurance or official documentation is required
The UT377C supports moisture screening, but it does not replace structural, electrical or hygiene assessments.
Suitable Users
The UNI-T UT377C Pinless Moisture Meter is suitable for:
Water-damage restoration teams
Renovation contractors
Building inspectors
Facility-management departments
Property managers
Maintenance contractors
Furniture and flooring businesses
Property owners performing preliminary checks
Contact MTM Precision for the UNI-T UT377C or assistance selecting moisture-testing equipment for post-flood inspection, building maintenance and restoration work in Malaysia.
MTM Precision Sdn Bhd
Showroom & Service Centre: No. 29-1 & 29-2, Jalan Bandar 18, Pusat Bandar Puchong, 47160 Puchong, Selangor, Malaysia
Tel: 03-8080 7172
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Website: www.mtmpre.com.my
30 Sep 2026
