Case study
Loft Insulation Case Study — Chimney Loft Insulation With Portable Work Lighting, Bradford
A central brick chimney breast divided this loft floor in two, with bare joists and no continuous insulation on either side. The 40m² floor was insulated to a full 300mm depth, cut to fit around the brickwork and hatch.
What we found
- •A central brick chimney breast dividing the loft floor
- •Bare joists and dusty ceiling surfaces across most of the space
- •A hatch close to the chimney that restricted the working area
- •No continuous insulation around the chimney or roof supports
The problem
The loft floor was exposed on both sides of a central brick chimney breast and had no effective insulation. Bare joists and dusty ceiling surfaces ran across most of the space.
The chimney and nearby hatch created an awkward working area, but they also left several narrow heat-loss paths that needed to be treated properly.
Our assessment
The loft floor measured approximately 40m². We recommended a 300mm Knauf glass mineral wool installation across both sides of the chimney breast, using 100mm between the joists and 200mm cross-laid above.
The installation
Portable work lighting was positioned near the chimney so the team could cut accurately around the brickwork and hatch. The 100mm base layer was installed between the joists and fitted into the narrow sections around the chimney.
The 200mm top layer was then laid across the completed areas, maintaining appropriate separation around the chimney and leaving the hatch clear. The eaves ventilation route was checked before the final clean-up.
The result
The loft was left with consistent 300mm insulation on both sides of the chimney and around the hatch, with appropriate separation maintained around the brickwork and the eaves ventilation route left clear.
The installation helped to
- Improved coverage around a central chimney breast
- Reduced heat loss from the front and rear bedrooms
- Improved insulation around the hatch
- Maintained safe clearance around brickwork
- Delivered a consistent 300mm finished depth
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