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Penetrating Damp from a Blocked Gutter on Waldeck Street, Reading RG1
A house on Waldeck Street in Reading had damp on two dining room walls: the external window wall and the adjoining party wall. The survey took place in continuous rain, which made the cause easy to see.
Project at a Glance
The Brief
The owners had staining and failing plaster on two dining room walls.
The Survey
It was raining continuously during the inspection at about 11 C. Inside, there was extensive plaster deterioration, moisture contamination and staining. Outside, the wall next to the dining room window and the neighbouring property junction was heavily stained, the gutter above was blocked and was actively overflowing onto the wall below.
Because the house has solid walls, the masonry has limited resistance to long term saturation. Rain discharging against it had soaked through the wall thickness, a clear case of penetrating damp, and had spread sideways through the junction to the party wall.
The Solution
Stop the water, then restore the walls:
- Clear and repair the blocked guttering.
- Remove the damaged plaster from the affected walls.
- Carry out damp proofing and replaster.
The Work
Advanced Damp carried out the damp proofing from 29 September to 1 October 2026.
The Result
With the gutter fixed, the solid wall is no longer being soaked, and the new finishes can stay sound. See more of our case studies.
Frequently Asked Questions
Can a blocked gutter cause damp inside?
Yes. Overflowing water runs down the same patch of wall every time it rains, soaking solid masonry through.
Why survey in the rain?
Rain shows exactly where water is going, which makes defects like overflowing gutters easy to confirm.
Why has damp spread to the party wall?
Moisture can travel sideways through a wall junction, so the adjoining wall gets wet too.
Damp after heavy rain?
Our CSSW and CSRT trained surveyors find the real cause before recommending any work. Non-invasive survey with a clear written report. No obligation.
Survey carried out by Lionel Sewell (FODCS) at Advanced Damp. Project completed in Reading, RG1.
Sam Fitzgerald is the founder of Advanced Damp and a working damp and structural waterproofing surveyor diagnosing and treating moisture problems in residential and commercial properties across London and the South East. He is FODCS certified (a Federation of Damp Certified Surveyor) and a member of the Federation of Damp. His hands-on work covers rising damp, penetrating damp, condensation, basement waterproofing to BS 8102, and thermal imaging surveys, and he has personally completed over 400 damp surveys across properties of every type and age. Everything he writes draws directly from jobs he has carried out. He does not write about treatments, products or causes he has not dealt with first-hand in the field.
