Case study
Loft Insulation Upgrade in London
This loft was found with only a thin, uneven layer of old insulation between the joists and belongings stored directly on top of it. Insulating both the 38m² floor and the 48m² roof pitch — and adding a 10m² boarded storage area — gave the whole loft a continuous, well-sealed insulation layer.
What we found
- •Only a thin, uneven layer of old insulation between the ceiling joists
- •Several areas with little or no insulation at all
- •Belongings stored directly across the joists and old insulation
- •Upstairs rooms cooling quickly once the heating was turned off
The problem
The loft was inspected as part of a full assessment of the roof space, covering the insulation at ceiling level, the pitched roof sections and the way the space was being used for storage.
During the loft survey, we found only a thin and uneven layer of old insulation between sections of the ceiling joists. Several areas had little or no insulation at all, meaning a significant amount of heat was able to escape through the loft.
The loft also had no usable storage area, with belongings previously placed directly across the joists and old insulation.
Our assessment
The loft had a floor area of approximately 38m², while the pitched roof sections measured approximately 48m². We recommended insulating both the loft floor and the roof pitch to improve the overall thermal performance of the space.
The proposed installation included 100mm Knauf mineral wool across the loft floor, SF19 SuperFOIL insulation across the 48m² pitched-roof area, and 10m² of raised loft boarding for safe and practical storage. It also covered the removal and repositioning of loose debris and damaged insulation, careful installation around cables, ventilation points and the loft hatch, and a final inspection and clean-up.
The installation
The existing insulation was checked and any unsuitable or heavily compressed material was removed.
We then installed 100mm Knauf mineral wool between the loft-floor joists, ensuring consistent coverage across the 38m² area. Particular attention was given to the edges of the loft, where gaps commonly allow heat to escape.
The SF19 SuperFOIL system was fitted across the 48m² roof pitch. The material was secured carefully across the rafters, with joints overlapped and sealed to create a continuous insulation layer.
A 10m² raised boarding area was then installed, providing a stable storage platform while helping to prevent the new floor insulation from being compressed.
The result
The finished loft has a continuous, even insulation layer across both the floor and the pitched roof, with the eaves kept clear and the stored belongings raised onto a proper platform above the insulation. It is an example of treating the loft floor and the roof pitch together, rather than only topping up the floor, in an older terraced home.
The installation helped to
- Reduced heat loss through the loft
- Improved comfort in the upstairs rooms
- Kept stored belongings off the new insulation layer
- Reduced draughts and cold spots
- Created 10m² of usable loft storage
- Improved the overall condition and appearance of the loft
Free, no obligation
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