Loft Insulation Case Study — Low-Pitched Loft Insulated Around Structural Supports, Coventry

The problem

The loft had a low roof pitch and multiple structural timbers, which had previously discouraged any full insulation upgrade. Much of the floor had been left exposed as a result.

Although a narrow access route had been laid, the surrounding joist bays remained exposed. Heat was passing through the ceiling across almost the entire loft floor.

Our assessment

The loft floor measured approximately 39m². We recommended 300mm of Knauf glass mineral wool, installed in smaller accurately cut sections around the timber supports. The existing access boards were retained where possible.

The installation

The first 100mm layer was fitted between the joists, with individual pieces cut around each vertical support, brace and trimmer. This avoided compression and ensured there were no large uncovered areas around the structure.

A 200mm cross-laid layer was then installed across the top. The team worked around the access boards and low eaves, maintaining a clear ventilation path and leaving the main route through the loft usable.

The result

The completed loft had full-depth insulation around the structural supports and across the previously exposed floor, cut to fit rather than compressed beneath the timbers.