The Ultimate Guide to the Various Types of Damp

The United Kingdom has a wet climate, due to its location in northern Europe and dampness is a big problem for homeowners. At London Damp Specialists, we are on the front line when it comes to finding and dealing with all forms of damp and in this blog, we offer a comprehensive guide to the different types of damp that can attack buildings and cause serious damage.

  • Rising damp – This is when moisture attacks timber and cement at ground level, which can then rise through the structure and cause extensive damage. When building a house, a damp proof course should be installed between brick courses at ground level to stop damp from rising into the timber and brickwork and if this is compromised, remedial work needs to be carried out.
  • Penetrating damp – Penetrating damp is typically caused by roof and guttering leaks and unlike rising damp, penetrating damp can affect a building at any height. Visible signs include damp patches and stains, along with mould on interior walls and should you see any of these signs, call us on 020 8528 3864 anytime and arrange for a damp survey that identifies damp issues wherever they might be located within the property. If you notice damp patches on walls or ceilings, this is a sign that water is entering the property and a damp survey will identify the causes.
  • Condensation damage – Condensation is caused by temperature differences, and it typically is found on the inside of single-pane windows. When warmth meets cold, condensation gathers and this can cause significant damage, starting with window frames and spreading to other materials if not checked.
  • Wet and dry rot – Both can seriously damage timber and early detection can save you thousands of pounds in repair costs. Our surveyors use state-of-the-art equipment to test the moisture content in timber, which is an accurate way to identify dry and wet rot, as well as woodworm. Double-glazed windows prevent the forming of condensation, as the temperature difference is minimal.

Potential causes of damp

Dampness can be caused by many things, including a leaking roof, blocked guttering and even blocked drains can result in moisture attacking the building. Another major cause of damp damage is defective brickwork and cement, which allows water to permeate through the structure and a damp survey is the only way to find out if your home has damp issues. Poor irrigation is another cause of damp, especially so if water pools near the property line; if you have a ruptured drainpipe this needs to be repaired as soon as possible.

Homebuyer damp survey

If you are in the process of buying a property in the London area, it is wise to order a homebuyer damp survey, as this is the only way to know for sure whether the property has damp issues. Call London Damp Specialist on 020 8528 3864 or fill in the online form on our website and let the industry professionals carry out a thorough survey and you receive a detailed written report within 24 hours of the survey completion.

Damp Survey Costs

Transparent pricing with no hidden fees for our independent, unbiased surveys.

Level 1

Level 1

£199 + VAT

What’s included:

  • Inspection of walls
  • Inspection of floors
  • Inspection of ceilings
  • Leak inspection of drains and plumbing
  • Damp information and prevention guide
Level 2

Level 2

£299 + VAT

What’s included:

  • Everything in Level 1
  • Dry rot inspection
  • Wet rot inspection
  • Woodworm inspection
  • Damp information and prevention guide

 Survey Add Ons

Add On 1

£299 + VAT
Lab Analysis Of Plaster

Laboratory analysis Of plaster identifies hygroscopic salts such as chlorides and nitrates. which indicate whether damp is caused by rising groundwater or by plumbing leaks, This testing removes guesswork, allowing the exact source of moisture to be identified so the correct treatment is applied rather than carrying out unnecessary damp-proofing work.

Add to Survey

Add On 2

£299 + VAT
Mould Lab Swab Testing, qPCR on DNA

qPCR DNA mould testing detects microscopic mould spores that are invisible during a normal inspection and van remain hidden behind walls, floors. or inside building rkaterials. It identifies the exact mould species present and the contamination level, allowing hidden mould problems to be confirrned and properly treated before they affect the property or occupants’ health.

Add to Survey

Qualifications: All our surveyors are PCA and CSRT qualified for remedial treatments and also CSSW qualified for structural waterproofing.
Next day report: You will receive the report within 24 hours of the inspection taking place.

The survey fee will be deducted from the cost of any recommended repairs.

These are the tools we use

A damp meter

A damp meter

A damp meter is a diagnostic tool used to detect and measure moisture levels within building materials such as plaster, brick, timber, and concrete.

Borescope camera

Borescope camera

borescope camera is a small inspection camera attached to a flexible semi-rigid cable that allows you to see inside areas that are otherwise inaccessible.

Inspection Drone

Inspection Drone

A drone is a remotely operated aerial device equipped with a camera that allows visual inspection from above without the need for scaffolding or ladder.

Air Humidity Sensor

Air Humidity Sensor

Air humidity sensor measures the amount of moisture present in the air, expressed as relative humidity (RH) in percentage. It helps determine whether indoor conditions are contributing to condensation, mould growth, or damp-related issues.

Thermal Imaging Camera

Thermal Imaging Camera

A thermal imaging camera detects temperature differences on surfaces by using infrared technology to produce a heat map image. In damp investigations, it helps identify cold spots, moisture intrusion, insulation defects, thermal bridging and leaks.

Air Flow Ventilation Detector

Air Flow Ventilation Detector

An air flow ventilation detector measures the movement and volume of air passing through vents, extractor fans, and air bricks. It confirms whether ventilation systems are working properly and achieving adequate air changes within a room. Poor airflow leads to trapped moisture, high humidity, condensation on cold surfaces, and ultimately mould growth.

Mould Swab Test Kit

Mould Swab Test Kit

A mould swab test is carried out to confirm the presence of hidden mould growth and identify the specific species involved. Surface mould is not always visible, especially behind furniture, inside cavities, or within ventilation systems. Laboratory analysis of a swab sample determines whether active mould spores are present and what type they are, which helps assess potential health risks and decide the correct remediation approach rather than relying on visual assumption alone.

Plaster Salt Analysis Lab

Plaster Salt Analysis Lab

Laboratory analysis of plaster is used to identify the type of salts present within the material, typically chlorides and nitrates. The presence and concentration of these salts help determine whether the moisture source is consistent with rising damp, ground contamination, or another forms [sic] of water ingress. such as mains water leak, This removes guesswork and prevents misdiagnosis, ensuring the correct remedial treatment is specified rather than applying unnecessary or ineffective solutions.

Contact Us

If you have some questions, please complete this form:

Book and Pay for a survey

If you are ready to book a survey and pay, please complete this form:

Contact Us

If you have some questions, please complete this form:

Book and Pay for a survey

If you are ready to book a survey and pay, please complete this form:

Contact Us

If you have some questions, please complete this form:

Book and Pay for a survey

If you are ready to book a survey and pay, please complete this form: