Condensation Control in Portsmouth
Warm, moist air meeting a cold surface — the most common damp in modern homes. Surveyed and carried out by our own Hampshire-based teams, with a written report and a 25-year insured workmanship guarantee.
Covering Dorset · Hampshire · Wiltshire
Book a Portsmouth survey
1/3Takes under a minute. A qualified surveyor attends — never a salesperson.
No obligation, no sales visit. Your details are used only to arrange the survey.
Condensation Control written for Portsmouth building stock
Southsea and Fratton hold 1880–1914 solid-wall terraces, many converted to flats. Paulsgrove, Buckland and Landport include significant post-war and system-built housing where thermal performance is poor and condensation severe.
Condensation causes more damp complaints than every other mechanism combined. A family of four puts several litres of water vapour into the air every day; if the property cannot move that air out, it lands on the coldest surfaces — window reveals, external corners, behind wardrobes, inside unheated bedrooms.
Local faults that lead to this work
- 01
Severe condensation in flats
Small, tightly occupied flats with a single intermittent extract fan produce persistent mould on cold external walls.
- 02
End-terrace gable saturation
Exposed solid-wall gables absorb driven rain and show broad internal damp patches.
- 03
Marine salt in masonry
Hygroscopic salt loading keeps plaster damp in humid weather and defeats ordinary replastering.
- 04
Basement and lower ground flats
Below-pavement flats need waterproofing design rather than damp proofing.
Scope of condensation control works
Your quotation lists only what your property actually needs.
- Humidity and dew-point assessment
- Extract fan performance testing and upgrade
- Continuous mechanical extract ventilation (dMEV)
- Positive input ventilation to hallway or landing
- Thermal boarding and cold-bridge insulation
- Anti-condensation coatings and mould treatment
Condensation Control in Portsmouth — answered
Rarely entirely. Occupancy adds moisture, but a property that cannot ventilate or that has significant cold bridging will condense regardless of how it is used. Our report distinguishes the two honestly, which matters if a landlord and tenant disagree.
In a house with a loft and a reasonably open hallway, yes — it dilutes moist air continuously rather than removing it in bursts. In flats without a loft void we use decentralised continuous extract instead.
Insulating without ventilating often makes condensation worse by making the building tighter. The two have to be specified together.
Free condensation control survey in Portsmouth
A qualified surveyor attends, tests properly and writes it down. No obligation, no sales visit, no charge.
Dorset · Hampshire · Wiltshire