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Low Level Damp on a Wall Inside a Conservatory on Munces Road, Marlow SL7
At a house on Munces Road in Marlow, the original outside wall of the house is now enclosed by a conservatory. Swollen skirting and damp at its base showed moisture was getting in at floor level.
Project at a Glance
The Brief
The owners had swollen MDF skirting and staining along the bottom of the conservatory wall.
The Survey
Staining and deterioration were concentrated close to the floor, with wet, swollen MDF skirting and lightweight plaster at the base. The pattern suggested moisture at the wall to floor junction being held and spread by the lightweight plaster. The tiled floor was not lifted, so the hidden junction could not be fully checked.
Outside, an unsealed tap pipe, cracking where the conservatory meets the house, differences in DPC levels and redundant openings may all have been contributing. The cavity had injected insulation, and uneven coverage around the conservatory may make the wall colder.
The Solution
Treatment to the accessible wall:
- Remove the damp plaster and skirting.
- Install a DPC and apply a waterproof cement render to around 1.2 metres, sealing the wall to floor junction where practical.
- Set out the external defects for the owner to address, then monitor through wetter months.
The Work
The internal work was completed in one day in September 2026.
The Result
The wall has a moisture resistant finish at the base, with clear notes on what sits outside the treated area. See our page on damp proofing in Marlow, or read about rising damp treatment.
Frequently Asked Questions
Why is the wall inside my conservatory damp?
It used to be an outside wall. Junctions with the new structure, floor levels and DPC changes can let moisture in at the base.
Why replace MDF skirting?
MDF swells when damp and holds moisture against the wall. It is replaced once the wall is treated.
Can cavity wall insulation affect damp?
Uneven or damp insulation can make parts of a wall colder or wetter, which can add to problems.
Damp inside a conservatory?
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 Chris Baxter 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.
