Passive House, Fife

The first passive house in Scotland to be insulated with Warmcel 500 blown fibre.

Passive House in Fife

The project has been a tremendous success with energy efficiency results which have helped the owner to achieve Gold Standard Sustainability Certification. Passivhaus certification is pending but is expected to be confirmed very shortly.

Assessment & Recommendation

We completed a full technical survey of the property and provided recommendations to maximise efficiency of the proposed insulation measures, following on from thickness calculations developed by the client’s Passive House consultant Rod Williams as part of the Passive House Planning Package (PHPP).

Recommended Measures:

We advised that a closed panel system should be adopted to ensure that there would be no slump in the insulation.

Warmcel Insulation was selected – made from recycled newsprint with a Global Warming Potential of -1.5. We worked closely with Warmcel manufacturer, Excel Fibre, to plan the best solution to reach the 65kg per m3 density Passivhaus standards.

Project - Passive House Fife - Interior


The 10 day install saw approximately 18.5 tonnes of Warmcel 500 injected into closed panels throughout the building.

A depth of 450mm was installed to all external walls and the roof.

Two mid floor cassettes and all internal partitions were also fully insulated with Warmcel 500.

Warmcel manufacturer, Excel Fibre, provided technical engineer support on site, completing frequent core samples and density checks.


The building has been awarded a Gold Standard Sustainability certificate and achieved Passivhaus standard with air tightness being recorded at just 0.34 air changes per hour (Passivhaus requirements allow up to 0.6).

‘A’ ratings were achieved for both running costs and carbon emissions – the average Scottish home is rated ‘D’.

When we visited in winter, the client was able to report that no heating had been turned on to date. The building retains heat beautifully and is naturally warm and comfortable despite its generous room dimensions and exposed location. An added benefit of the Warmcel installation to the internal walls and floors is its acoustic performance.

Passive House in Fife
Passive House Fife - EPC
Energy Efficiency Rating Achieved
Passive House Fife - Carbon
Environmental Impact (CO2) Rating Achieved

I’d have no hesitation in recommending GoSustainable, they were first class. The Warmcel installation went very well – no issues at all. We discovered a few voids that had been missed, but the guys came back straight away to attend.

Shaun Kerr, Project Manager