Penetrating damp diagnosis and repair
We trace rainwater and other external moisture through roofs, gutters, masonry, render and openings before the source and damaged finishes are repaired.
Signs worth having checked.
- Patches that worsen after rain
- Damp around a chimney, window or outside wall
- Blown render or defective pointing
- Localised ceiling or wall staining
The symptom is the starting point.
The same mark can have several causes. We use your description to prepare, then inspect the property before recommending work.
What does a survey include?Checks that put the symptoms in context.
- Gutters, downpipes and visible roof junctions
- External masonry, pointing and render
- Window, door and wall details
- Cracks, flashings and service penetrations
- Whether a plumbing leak is more likely
Clear next steps.
- Targeted repairs outside the property
- Masonry or render repairs where specified
- A water-repellent system only where the substrate is suitable
- Drying and internal making-good after the leak is stopped
The recommendation depends on the property and the evidence found during the survey.
What the inspection can and cannot establish.
- External defects may be concealed by finishes, height or neighbouring property boundaries.
- A single visit cannot confirm how a wall will dry or whether hidden fabric has been damaged.
- Roof spaces, shared areas and services are checked only where safe access and permission are available.
Different properties need different answers.
- Repairing a gutter, roof junction, pointing, render or opening detail
- Addressing a plumbing leak where internal water entry is more likely
- Allowing the wall to dry before deciding on plaster or decoration
- Using a compatible water-repellent treatment only when the substrate and exposure make it suitable
Deal with the cause, then the finish.
- Trace the likely route of water from the visible symptom outwards.
- Stop the external or plumbing source and allow affected materials to dry.
- Repair or replace damaged finishes once the source is controlled.
- Review the area after heavy weather or an agreed drying period where monitoring is useful.
What a quotation or report should make clear.
- The defect or area included in the proposed repair
- Access, preparation, materials and making-good that are included
- Items outside the scope, such as roof or plumbing work by another trade
- Any assumptions about drying, weather and access
Small checks help protect the result.
- Keep gutters, gullies and downpipes clear and check them after heavy rain.
- Look for fresh staining after rainfall rather than painting over a returning mark.
- Keep the repair and product information with your property records.
UK guidance worth keeping.
These public sources provide background on moisture, ventilation, timber or below-ground work. They are useful context, not a diagnosis of your property.
Penetrating damp: questions and answers.
Why does the patch appear after heavy rain?
Rain can enter through one defect and travel through masonry or timber before showing indoors. The visible patch may be some distance from the entry point.
Will waterproof paint solve penetrating damp?
Not while water is still getting in. The defect needs to be found and repaired before an internal finish is considered.
Can gutters cause damp inside a house?
Yes. A leaking or overflowing gutter can keep saturating the wall below it. Its condition and discharge route are part of a proper inspection.
Related WeatherWise Solutions case studies.
Talk to WeatherWise Solutions about penetrating damp
Tell us what you have noticed and where the property is. The WeatherWise Solutions team will help arrange the right next step.
WeatherWise Solutions
Based in Newcastle-under-Lyme and serving the Midlands and North West by appointment. You can see our business details and customer reviews on Google.