Case study
Loft Insulation Case Study — Old Fibreglass Cleared and Replaced in a 30m² Loft, Malton
This 30m² loft in Malton had old fibreglass that was thin, dirty and broken up between the joists. We cleared it out, treated the timbers, fitted lap vents and laid new Knauf mineral wool across the loft floor.
What we found
- •Old fibreglass, thin and broken up between the joists
- •Insulation covered in dust and debris
- •About 30m² of loft floor with a brick gable wall
The loft
The loft floor was about 30 square metres, with a brick gable wall at one end. The old fibreglass between the joists had thinned out over the years and was covered in dust and debris, so it was doing very little to keep the heat in the rooms below.
Our surveyor measured the old insulation and photographed every part of the loft, including the ventilation and damp meter readings, so the recommendation was based on what was actually there.
What we recommended
Laying new insulation on top of old, dirty fibreglass leaves an uneven layer and hides the state of the timbers. So the recommendation was to clear the loft first, treat the timbers, add ventilation and then lay a full new layer of mineral wool.
The work
The old fibreglass was removed and the loft cleared back to the joists. The timbers were given a mould spray, and lap vents were fitted so air can move through the roof space.
New Knauf mineral wool was then laid across the full 30 square metres, right up to the gable wall, as the after photo shows.
The work helped to
- Replace old, dirty fibreglass with a clean new layer
- Cover the whole loft floor evenly, up to the gable wall
- Add ventilation to the roof space
- Treat the timbers while the loft was clear
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