Written by Seth Long, Damp Pro and Co · Last updated: 7 October 2026
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Ask about wet or dry rot assessment availability.
Distinguishing decay from ordinary surface damage
Peeling paint, a swollen joint or a dark stain does not alone establish fungal rot. Boards can be damaged by repeated washing, impact, an old leak or moisture trapped behind an impermeable finish. Timber decay concerns the condition of the wood itself, not simply the colour of the coating.
Look without forcing tools into the board: note obvious softness, crumbling edges, distortion or areas pulling away from the wall. An inspection may need to assess concealed faces and adjoining materials. Do not remove long sections yourself where cables, pipes or floor fixings could be hidden. Take photographs of the visible condition and the wall immediately above it.
Leaks can concentrate water at floor level
A small plumbing leak can repeatedly wet the same short section of skirting. Radiator valves, supply pipes, shower junctions and nearby appliances are possible sources. Water can travel under flooring or along a wall before appearing at the board, so the nearest visible fitting is a starting point rather than proof.
If a leak is active, arrange appropriate repair and protect people from slippery floors or electrical hazards. Drying and timber repair follow the source control. A replacement board fitted while the backing remains wet is vulnerable again. Note whether the damage is isolated, whether the floor feels damp and whether recent plumbing or bathroom work changed the pattern.
When rising damp is part of the investigation
Ground moisture moving through masonry can affect timber beside the base of a wall. Salty or damaged plaster above the skirting, raised outside levels and the condition of an existing damp proof course are relevant checks. Similar marks can also come from leaks or condensation, so timber damage is not a reason to choose injection automatically.
Our rising damp treatment page explains the wall-moisture assessment and the relationship with plaster repairs. Where new DPC work is appropriate, the skirting and internal finish still need their own condition checks. The barrier does not restore decayed timber or instantly remove moisture already present in the wall.
Wet rot and dry rot: clues, not a home diagnosis
Wet rot describes fungal decay associated with persistently damp timber. The affected wood may soften, darken or break down, but appearance varies with the organism, coating and stage of damage. Attention to the water source and the condition of neighbouring timber is more useful than relying on one photograph of an exposed board.
Dry rot is a particular fungal decay that also needs moisture, despite its name. Cracked timber, fungal strands or fruiting growth can raise concern, but other fungi and materials may resemble them. Suspected spread beyond the skirting needs competent assessment. Our information on wet rot treatment and dry rot treatment explains these decisions and assessment arrangements.
Check beyond the decorative board
The wall behind the skirting, the floor perimeter and concealed timber may have experienced the same wet conditions. In older suspended floors, this can raise questions about joist ends and underfloor ventilation. A decorative board should not be treated as the whole repair if weakness, movement or fungal growth suggests a wider problem.
Structural timber needs assessment by someone suitably qualified. Avoid walking on an area that feels unsafe or opening floors without understanding what is underneath. Blocked air bricks and piled outside soil can be noted from ground level, but clearing them does not establish the condition of concealed wood. Agree the investigation scope before opening up or replacing materials.
What a repair plan should cover
The plan should separate stopping water, assessing affected timber, drying and replacement or treatment. Not every stained board needs disposal, and treatment liquid cannot restore lost strength. The material condition determines what can be retained. Any repair should account for the backing wall and the floor junction, not simply reproduce the previous decorative arrangement.
Where plaster also needs replacement, coordinate the work so sound or new skirting is not repeatedly removed. Our replastering after damp proofing guide explains that sequence. Electrical fittings within the affected area require appropriate arrangements, and a qualified electrician should handle isolation or alteration rather than leaving cables exposed during stripping.
Need it sorted? Discuss wet or dry rot assessment
Read the wet rot repair information or dry rot assessment information, then ask Seth about availability and suitable inspection arrangements. Use the enquiry form below for accompanying household damp concerns and describe the damaged board, nearby fittings and any changes in the floor or wall.
Keep the suspected source accessible where safe and avoid painting over evidence before assessment. Tell the person inspecting about previous leaks, repairs and hidden services. The priority is to establish the extent of damage and stop the water feeding it; replacing the visible trim is the final part of a considered repair, not the diagnosis itself.
Need it sorted?
Ask about wet or dry rot assessment availability.
Related services
Covering Ruislip, West London and South Bucks.
Questions about this topic
Does soft skirting always mean dry rot?
No. Persistent moisture can produce several kinds of decay or material damage. Identification needs the timber condition and surrounding moisture assessed together.
Can new skirting be fitted while the wall is still wet?
Avoid enclosing unresolved moisture. The repair plan should establish drying conditions and a suitable sequence for the wall finish and timber.
Will wood filler repair a rotten board?
Filler can address some cosmetic defects but cannot restore seriously decayed timber or stop the moisture feeding deterioration.
Related guides
- Replastering after damp proofing
What happens after a new damp proof course: stripping plaster, salt-resistant systems, drying out and decorating.
- Signs of rising damp
Tide marks, salty plaster, lifting skirting and the outside checks that show whether damp is rising from the ground.