Case study
Loft Mould Treatment in Bristol
Loft mould treatment in a 1930s semi-detached home
What we found
- •Widespread black mould on roof lining and rafters
- •Condensation staining around the eaves
- •Insufficient ventilation
- •Old, dusty insulation with reduced performance
- •No signs of active roof leaks
The problem
The loft had a musty odour and black spotting across the boarding. The mould was caused by condensation due to poor ventilation and cold roof surfaces. Left untreated, it could damage timbers, reduce insulation effectiveness and impact indoor air quality.
Our assessment
We carried out a full inspection of the loft, measuring temperature and humidity levels. The roof void was found to be under-ventilated with high relative humidity. Mould growth was active but superficial, and the timbers were in good condition.
The treatment
A professional biocide solution was applied to all affected roof lining and timber surfaces using low-pressure spray equipment, working down from the ridge to the eaves. Surrounding areas prone to condensation were treated at the same time, and the eaves were left clear so air could move through the roof void.
The result
The treated surfaces were left clean and free of visible surface growth. The timbers were sound throughout and no repairs were needed. The ventilation shortfall behind the condensation was set out in the written recommendation, along with what to keep clear at the eaves.
The treatment helped to
- Treat the affected roof lining and timber surfaces
- Clear visible surface growth from the boarding
- Cover the eaves areas where condensation had been forming
- Record the ventilation shortfall behind the mould
- Set out what to keep clear to control moisture
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