Condensation and Mould in a Flat on Chalfont Court, Marlow SL7
A flat at Chalfont Court in Marlow had mould in the entrance hall and around window and door reveals. The owners were worried about rising damp, but the survey found something different.
Project at a Glance
The Brief
The owners wanted to know whether the mould meant damp was coming into the flat.
The Survey
After a full internal and external check, no rising damp or structural moisture was affecting the living areas. The main cause was condensation, from local thermal bridging at the entrance door, low surface temperatures and intermittent heating.
A separate, minor issue was found outside at the stairwell, where a small structural junction crack was letting in a little moisture, though not affecting the internal walls.
The Solution
Proportionate measures:
- Clean the affected areas with a mould treatment wash.
- Seal the external junction crack with a fillet seal.
- Improve the entrance door and bathroom extraction, and keep heating more consistent.
The Work
The mould wash and fillet seal were completed in one day in September 2026.
The Result
The owners avoided unnecessary damp proofing and got advice aimed at the real cause. See our page on damp proofing in Marlow, or read about mould removal.
Frequently Asked Questions
Is mould by my front door rising damp?
Usually not. Doors and frames can be thermal bridges where condensation forms first.
What is thermal bridging?
A part of the building that conducts heat out faster than the rest, creating a cold spot where moisture condenses.
Will a mould wash fix the problem?
It removes the mould, but heating, ventilation and cold spots must be addressed to stop it returning.
Mould in a flat?
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 Marlow, SL7.
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.
