A full diagnosis and remedial service

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…and damp can often lead to mould in a property, which is a major health hazard and can lead to loss of revenue for social housing providers and landlords

Rainbow International are one of the UK’s leading experts in diagnosing the causes of damp and condensation, which can lead to mould, combining a full diagnostic process with a plan for remedial action, along with a programme to eradicate the mould problem.

Insurers, homeowners, landlords and tenants can all benefit from the comprehensive service offered by Rainbow International, across the UK.

Mould is classed as a category one risk to health, as assessed under the Housing Health and Safety Rating System 2000, which is the same class as asbestos. The Environmental Protection Act (1990) classifies mould as a statutory nuisance that must be treated.

The Rainbow International system incorporates a 3 level process when considering Damp and Condensation issues in any property in the process of mould removal, and damp diagnosis


Risk Assessment

Prior to any survey, we will carry out a full risk assessment including an assessment of ACM (Asbestos Containing Materials)


Rainbow International’s highly experienced technical team will then carry out a survey on the property for damp diagnosis in order to identify the possible causes of damp penetration and condensation inside the property. They will check for the following:

General state of repair of the property – evidence of poor maintenance, often the source of water ingress and penetration into a property, including:-

  • Brickwork, rendering & mortar
  • Roof – condition of roof tiles or flat roofs
  • Downpipes & guttering
  • Flashing around chimney stacks and in adjoining elements
  • Damp proof membrane – any evidence of missing, breached or faulty DPM
  • Waste pipes
  • Outside doors
  • Window units (paying particular attention to double glazed units and any lack of ventilation)
  • Air bricks – check for blockages
  • Measurement of moisture, humidity and temperature in all building materials with hi tech measurement equipment. This will confirm the conditions in the property as either damp and at risk of mould contamination, or dry and comfortable living conditions.
  • Picture opposite demonstrates moisture readings being taken which will determine the remedial action required.


  • Internally, the Rainbow International technicians will check for visible damp conditions and evidence of mould contamination.
  • Damp and mould will often be concealed within the building structure – for example in cavities, under floorboards and behind skirting boards.
  • Wherever mould is evident, there is usually much more of it hidden within the building structure. We employ a wide range of sophisticated technical equipment to identify and analyse the contamination in these hidden areas, such as Endoscopes and Borescopes with attached Inspection cameras which allow a detailed internal visual inspection in hard to access areas, without major disruption or damage to the building and its contents/decor.


Following the survey, a full report will be issued to the landlord, homeowner, plumber or another instructing party, which will provide a complete analysis of the causes of damp and mould, and a course of remedial action will be proposed which will eradicate the problem, by getting rid of the mould. However, the damp that causes the mould also needs to be eradicated, so our programme will also suggest ways of getting rid of the damp. Upon approval of the summary of works Rainbow International will commence the treatment, which depending on the nature and severity of the damp and mould will include the following treatments:-

  • Washing, spraying or fogging of the affected areas with an appropriate anti-microbial will sanitise the contaminated surfaces.
  • Removal of plaster and wood where contamination is severe or dry/wet rot has taken hold.
  • Air Manager – an air sterilisation unit which will kill all airborne spores released from mould infestation can be deployed if necessary.
  • Installation of drying equipment regime – a combination of dehumidifiers, air movers & heaters will be deployed to ensure moisture and relative humidity levels are consistent with healthy living conditions.
  • Monitoring of drying regime – to guarantee suitable damp free conditions are maintained.
  • Installation of appropriate ventilation systems (if appropriate).
  • Stripping out and replacing of units and building materials that have been affected beyond repair by the damp or mould.
  • Redecorating following cleaning and sanitisation.
  • Sign off/handover – following treatment and drying of property, a certificate will be issued which will confirm the home is conducive to a healthy living environment and is free from damp and mould.

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24/7 Emergency Cover

Call us at 01322 662277 or 01322 515961

Our services are delivered 24 hours a day through a national network of over 70 branches strategically located across the country, providing a local service efficiently, reliably and cost effectively.  We can be on-site in an emergency situation within 2 hours anywhere in the country, commencing work, minimizing the risk of secondary damage and returning homeowners lives and commercial businesses back to normal with the minimal disruption and downtime.

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