Damp from Raised Ground and a Low Air Brick on Beach Road, High Wycombe HP11
A property on Beach Road in High Wycombe had damp in the bathroom, rear entrance hall, kitchen and storeroom. The survey traced it to several problems outside, plus a leak under the kitchen units.
Project at a Glance
The Brief
The owners had damp affecting several rooms at the back of the property and wanted it sorted in one go.
The Survey
The surveyor concluded the damp was mainly external moisture getting in, not one isolated defect. Raised ground levels were bridging the damp proof course, the rear threshold detailing was defective, and the only air brick sat at ground level, giving poor low level ventilation.
A leaking stop cock under the kitchen units was also adding to the moisture inside. The readings matched these routes in, a pattern characteristic of penetrating damp and moisture ingress.
The Solution
A combined internal and external package:
- Remove damp plaster, render and skim the affected walls.
- Fit a passive vent and move the air brick clear of ground level.
- Form a fillet seal at the threshold and apply a water repellent facade cream to the external wall.
- Have the stop cock leak repaired.
The Work
The work was completed over seven days in June 2026.
The Result
Each route in was closed off as well as the walls being repaired. See our page on damp proofing in High Wycombe.
Frequently Asked Questions
Why does an air brick need to be above ground?
An air brick at ground level lets water and debris in and gives poor ventilation. It should sit at least 150mm above ground.
What is facade cream?
A water repellent treatment for brickwork that reduces rain soaking in while letting the wall breathe.
Can a plumbing leak look like damp?
Yes. A slow leak under units can raise readings nearby, so it must be fixed alongside any damp work.
Damp in several rooms?
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 High Wycombe, HP11.
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.
