Exploring the Long-Term Effects of Untreated Rising Damp

When a property suffers from rising damp, it is important to take prompt action. Combatting the effects is only possible through professional treatment pathways. But what if the problem is simply left unaddressed? Untreated rising damp causes a whole manner of chaos within any property and this guide explores the reasons why.

What Causes Rising Damp?

Rising damp is largely caused by groundwater. This, as the name suggests, rises from the ground and seeps into your walls. It impacts both internal and external walls and can be difficult to navigate on your own. It is often difficult to notice a problem exists until there are visible signs inside your property.

The Warning Signs

The biggest warning signs of a rising damp problem include a bad smell, dark patches of moisture on the walls and skirting boards, mould, and salts on the walls.

The Impact of Untreated Rising Damp

When rising damp is untreated, there is an array of problems that can come about. These are unpicked in more detail below.

Ruined Décor

The first problem that tends to be the primary point of concern is that rising damp will always impact the décor of the area. You are likely to see patches of wallpaper peeling off or even ripping, and the plaster underneath can start to bubble, which will give the appearance of a warped wall area too. While décor is an aesthetic problem, it affects how you feel about a space and it costs money to fix. It is worth noting that there is no point in redecorating and reapplying things like wallpaper until a rising damp problem has been assessed and treated because the issue will just continue to return.

Woodwork Damage

The skirting boards will be impacted in a room with rising damp. Where the skirting boards are painted, there will be noticeable signs of flaking and wetness and it will be impossible to stay on top of it if the problem is allowed to fester.

Timber Damage

Aside from baseboards, internal wood will also be affected in many negative ways. Firstly, it will be vulnerable to rotting, and this is incredibly difficult to move on from. The majority of homes have some form of timber internally, potentially a suspended timber floor in an older property, and rising damp will find its way there if you don’t sort the problem out. It is, of course, entirely possible that it has already impacted the timber, and if this is the case, there will need to be further specialist treatment to fix the damage. For example, if this starts to affect your floorboards where the damp has taken hold, then there is a big concern that the floor itself will become weak and compromised. It may even fall through with enough pressure and continued exposure to damage. This will make your whole room unsafe.

Brickwork Damage

The external brickwork will see a few signs of noticeable consequences where there are concerns about rising damp. There may be mineral build-ups or the mortar might suffer from degradation. Fortunately, as long as DPC is operational as soon as possible, bricks and mortar are easy enough to salvage in the grand scheme of things.

Mould

Mould, though not a structural issue, is still a major concern for anyone with this problem in their home. Mould impacts health and makes it difficult to live in the area until it has been resolved. The sad fact is, that without some kind of rising damp treatment, mould will never be eradicated within the property. Therefore, it will come back time and time again because it favours damp conditions and festers there most commonly.

Damp Odour

A lingering damp odour is exceptionally difficult to combat and tends to linger for a long time. Damp has its own distinct smell and will be noticeable immediately upon entering the property if the problem has been left untreated. While a bad smell is not the end of the world, it detracts from both the value of the building and the overall enjoyment.

Common Treatment Paths For Rising Damp

The most common treatment path for rising damp is a DPC. A trained professional who understands the problem and the best way to address it must do so. Once complete, which may take between three days and 3+ weeks depending on the extent of damage, it will be possible to redecorate and use the room comfortably with your health intact. There are a few different types to think about, and there is more information here.

Creams

DPC cream is a very common treatment. It is injected straight into the mortar of the wall and requires complete removal of any plaster before it can take place. It is highly effective, and the more cost-effective option where it is possible.

Rods

If cream is not advisable, there may be a path forward for DPC rods. Like creams, they are placed in the mortar and aim to soak up the moisture as it traverses through the structures. This is more costly than cream but is effective when done properly.

DPC

Sometimes, there is a need to completely revamp the original damp proof course. This is the most expensive option, but properties that need it will benefit greatly. It is a complex procedure and will take longer than the first two options.

What Should You Do?

If you notice any signs of rising damp, act immediately. There is no point at all in delaying the treatment because this will simply make your property vulnerable to extensive damage throughout every room where the problem exists. While rising damp is harder to diagnose, it is incredibly straightforward to treat in the majority of cases.

Untreated rising damp causes chaos and untold damage to any property. Where the signs are spotted, it is vital that you get in touch to carry out a survey and professional assessment of the area. Left to its own devices, rising damp will damage the integrity of your foundation and structure to the core and make it difficult to decorate and live comfortably.

Professional Damp Diagnostic Equipment

Electronic Moisture Meter

Purpose:

Takes comparative moisture readings from accessible walls, floors, ceilings and other surfaces to identify abnormal moisture patterns.

Common Uses / Notes:

Helps the surveyor map affected areas and identify patterns associated with rising damp, penetrating moisture, condensation and potential leaks. Readings support the survey but are not a diagnosis on their own.

Deep-Reading Moisture Meter

Purpose:

Investigates below the immediate surface of building materials without requiring extensive removal of finishes.

Common Uses / Notes:

Helps locate moisture within walls, beneath accessible floors, inside subfloor areas and deeper within the building fabric where hidden moisture is suspected.

Non-Destructive Moisture Scanner

Purpose:

Checks for changes in moisture beneath walls, ceilings and flooring non-invasively without puncturing or damaging the finished surface.

Common Uses / Notes:

Ideal for decorated walls, ceilings and flooring where pin testing would be undesirable. Useful for tracing water migration paths and comparing dry areas against suspected damp sections.

High-Definition Borescope Camera

Purpose:

Provides a close visual inspection of concealed or difficult-to-access spaces without opening up large sections of the building.

Common Uses / Notes:

Used beneath floors, inside wall cavities, behind linings and around hidden pipework to uncover leaks, hidden moisture, timber decay, or construction defects with minimal disturbance.

4K Aerial Drone

Purpose:

Captures high-resolution images of roofs, chimney stacks and other inaccessible high-level external areas.

Common Uses / Notes:

Inspects roof coverings, chimney stacks, flashing, guttering, parapet walls, valleys, high-level brickwork and difficult elevations to reveal defects linked to penetrating damp and water ingress. Subject to weather, safety rules and flight regulations.

Indoor Humidity Monitor

Purpose:

Measures the amount of moisture held within the indoor air (relative humidity and temperature).

Common Uses / Notes:

Helps determine whether high ambient humidity, insufficient ventilation, or surface condensation could be contributing to black mould growth and damp conditions.

Infrared Thermal Imaging Camera

Purpose:

Displays surface temperature variations across walls, floors and ceilings.

Common Uses / Notes:

Assists in identifying cold bridging, condensation risk, insulation irregularities, thermal patterns and hidden water leaks. Interpreted alongside physical moisture readings rather than treated as proof of damp on its own.

Ventilation and Airflow Tester

Purpose:

Tests the extraction performance and airflow velocity of mechanical extractor fans and ventilation outlets.

Common Uses / Notes:

Assesses extractor fans in kitchens, bathrooms and utility rooms to determine whether moisture-producing areas have sufficient extraction rate (L/s or m3/h) to control humidity, condensation and mould risk.

Multi-Gas Detection Equipment

Purpose:

Screens indoor air to identify certain gases present within the property.

Common Uses / Notes:

Supports investigations involving drain smells, suspected sewer gases (H2S, NH3, CH4), combustion concerns (CO, O2) and flammable gases (CH4, C3H8). Does not replace testing or certification by a Gas Safe registered engineer.

VOC and Chemical Vapour Monitor

Purpose:

Screens the air for Volatile Organic Compounds (TVOC/VOC) and chemical substances such as formaldehyde (HCHO).

Common Uses / Notes:

Useful when investigating unusual chemical smells, building material emissions/off-gassing, conditions following water damage, or general indoor air quality concerns.

Fine Particle Monitor

Purpose:

Measures airborne material and particle concentrations across precise size ranges, including PM1.0, PM2.5 and PM10.

Common Uses / Notes:

Supports investigations involving fine dust, smoke, poor indoor air conditions and environments affected by post-leak damage or extensive mould contamination.

Socket and RCD Testing Device

Purpose:

Provides limited, basic electrical safety and protective circuit screening during the inspection.

Common Uses / Notes:

Helps identify certain socket wiring problems, confirms the operation of Residual Current Device (RCD) protection and detects AC voltage in damp areas. Does not constitute a full electrical inspection or an Electrical Installation Condition Report (EICR).

Equipment & Inspection Levels

Level 1

Essential Damp Survey

Standard price: £299 + VAT

Promotional Price: £199 + VAT (Limited Time Offer)

Offer ends in--Days--Hours--Mins--Secs

Repair Deduction: Full survey cost deducted if remedial work is instructed.

The Level 1 survey is an entry-level inspection of the main accessible areas. It is intended for relatively straightforward concerns involving visible damp, suspected rising damp or isolated moisture patches.

Equipment Provided

  • Electronic damp meter

Areas and Checks Included

  • Accessible walls
  • Accessible floors
  • Ceilings
  • Visible drain and plumbing leak checks
  • Damp information and prevention guidance

Recommended For

This option is suitable when a customer needs a basic assessment using a standard damp meter. It can be used for a general check or where there is a simple and clearly defined moisture concern.
The inspection covers accessible internal surfaces, drains and plumbing but does not include the advanced diagnostic instruments provided with the higher survey levels.

The survey price will be deducted if we undertake the recommended remedial work.

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Level 2

Enhanced Damp & Timber Survey

Standard price: £399 + VAT

Promotional Price: £299 + VAT (Limited Time Offer)

Offer ends in--Days--Hours--Mins--Secs

Repair Deduction: Full survey cost deducted if remedial work is instructed.

The Level 2 survey includes the Level 1 inspection together with deeper moisture investigation and checks for timber-related deterioration.

Equipment Provided

  • Electronic damp meter
  • Deep-reading moisture meter
  • Non-invasive moisture scanner

Areas and Checks Included

  • Accessible walls, floors and ceilings
  • Visible drain and plumbing leak checks
  • Wet rot inspection
  • Dry rot inspection
  • Woodworm inspection
  • Deeper moisture readings from suitable building materials
  • Non-destructive moisture checks beneath accessible floors and within subfloor areas
  • Damp information and prevention guidance

Recommended For

It is appropriate for concerns involving wet rot, dry rot, woodworm, concealed dampness or moisture below finished surfaces.
The combination of deep-reading and non-invasive instruments allows the surveyor to gather information from subfloors, beneath accessible floorboards, behind suitable panelling and within other reachable concealed areas without unnecessary dismantling.

The Level 2 survey is a good choice for buyers and sellers who require a more detailed damp and timber assessment before proceeding with a property transaction.

The survey charge will be deducted from the cost of remedial work undertaken by us.

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Specialised Laboratory Testing Add-Ons

Add-On 1

Laboratory Analysis of Plaster Samples

Price £299 + VAT

(The cost of this add-on is deducted from your repair bill if we carry out the recommended remedial works).

Small plaster samples are carefully taken from affected walls and sent to an independent laboratory to analyse the concentration of hygroscopic salts (chlorides and nitrates).

Why it matters: Hygroscopic salts are carried by ground moisture during rising damp and remain in plaster even after masonry dries.

Diagnostic value: Differentiates true rising damp from condensation, rainwater penetration, or temporary plumbing leaks.

Note: Salt analysis can be particularly helpful when moisture-meter readings alone do not provide a sufficiently clear diagnosis. It may assist in distinguishing possible rising damp from condensation, water penetration or residual contamination caused by a historic leak. 

The results are considered together with the moisture profile, construction of the building, external ground levels, condition of the damp-proof course and other survey observations. This is the only additional service requiring minor invasive work because physical plaster samples must be collected. If we undertake the recommended remedial work, the survey cost will be deducted from the cost of that work.

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Add-On 2

Laboratory Mould & qPCR DNA Analysis

(The cost of this add-on is deducted from your repair bill if we carry out the recommended remedial works).

Surface swab or lift samples are submitted to an accredited laboratory for advanced qPCR DNA testing to identify exact mould species and spore concentrations.

Why it matters: Identifies toxigenic species (e.g., Stachybotrys chartarum) and concealed mould growth behind dry lining or furniture.

Diagnostic value: Establishes whether mould contamination is localised or widespread, enabling precise environmental remediation planning.

This service may be beneficial where:

  • A persistent musty smell is present
  • Mould repeatedly returns after cleaning
  • The property has experienced previous water damage
  • Contamination is suspected behind furniture or inside cupboards
  • Occupants have concerns about the indoor environment
  • The extent of visible mould is unclear
  • Independent laboratory evidence is required

Note: The results can help establish whether contamination appears isolated or more widespread. They may also assist with planning appropriate cleaning, removal, drying, ventilation or moisture-control measures.

Laboratory mould testing does not replace the need to investigate the moisture source. Mould is normally a symptom of excess moisture, condensation, leakage or inadequate ventilation, so the underlying cause must also be identified. If we carry out the recommended work, the survey fee will be deducted from the cost of that work.

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Add-On 3

Gas, Vapour & Airborne Contaminant Screening

Price £299 + VAT

(The cost of this add-on is deducted from your repair bill if we carry out the recommended remedial works).
Comprehensive environmental air quality screening for properties with persistent odours, post-flood contamination, or air quality issues.

Screening includes:

  • Indoor air-quality assessment – IAQ
  • Volatile organic compounds – TVOC/VOC
  • Formaldehyde – HCHO
  • Fine airborne particles – PM1.0, PM2.5 and PM10
  • Dust and smoke particles – PM1.0, PM2.5 and PM10
  • Sewer gas screening – H2S, NH3 and CH4
  • Flammable gas screening – CH4 and C3H8
  • Carbon monoxide – CO
  • Hydrogen sulphide – H2S
  • Ammonia – NH3
  • Oxygen levels – O2
  • Stale-air and ventilation assessment – IAQ and TVOC
  • Drain odour investigation – H2S, NH3 and CH4
  • Chemical smell investigation – TVOC, VOC, HCHO and NH3
  • Post-leak air and surface-condition checks – PM2.5 and TVOC
  • Combustion gas screening – CO, O2 and CH4
  • Building-product off-gassing assessment – TVOC and HCHO
  • General pollutant screening – PM1.0, PM2.5, PM10 and TVOC

Diagnostic value: Pinpoints the source of foul drain odours, chemical off-gassing and stale air problems linked to poor ventilation. It is also useful when a property contains a persistent foul, stale or unexplained smell. Odours can originate from damp building materials, stagnant water, contaminated drains, sewer gases, mould-related conditions or chemical vapours. Targeted screening helps narrow down the possible source and supports further investigation.

Note: Screening results do not replace specialist gas, environmental or medical assessments where these are required. The survey charge will be deducted if London Damp Specialists completes the recommended remedial work.

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