INSULATION 71
Huntsman H2 Foam Lite was sprayed to a depth of 230mm in the timber frame external wall and roof structure and 300mm at the roof/wall perimeter area.
From an environmental perspective, H2
Foam Lite claims a Global Warming Potential of 1 and an Ozone Depletion Potential of 0 [Zero]. Furthermore, it doesn’t emit any harmful gases once cured, another important factor in the choice of insulation. “Ruth is very sensitive to chemicals in the air, the fact that H2 Foam Lite is becomes inert after a few seconds, with little or no off-gassing after installation, made it the perfect choice for us” said Robert Glass.
Thermally effi cienct structure H2 Foam Lite was used in the external wall and roof areas to create a highly thermally effi cient structure. External walls are a combination of 250 mm outer leaf of Lakeland stone facing with 140 mm thick timber frame inner leaf with spray foam fi lling. Inner 50 mm thick battening allowed an extra 90 mm thickness of foam insulation
A completed section of the building prior to trimming back of the breathable foam insulation to accept plaster boarding
giving an overall thickness of wall insulation of 230 mm.
Where timber cladding was used to visually soften the exterior appearance, wall sections comprised 22 mm thick larch cladding, facing a 140 mm thick timber frame supporting structure with foam insulation infi ll. Similarly, 50 mm thick inner battening allowed an extra 90 mm thickness of foam insulation giving an overall thickness of wall insulation of 230 mm.
Roof areas also received high level of insulation. Pitched roof areas are timber clad over a glass fi bre water-proofi ng layer that overlays 18 mm OSB [oriented strand board] fi xed to 145 x 50 mm rafters with foam infi ll. Foam fi lled 50 mm thick inner battening gives an overall thickness of
insulation of 230 mm. Flat
roof areas beneath the roof terrace received additional treatment with 300 mm thick
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foam sprayed around the perimeter where the roof and walls meet, to fully seal any potential gaps.
Robert and Ruth acted as both designers and main contractors for the reconstruction process, a huge task whilst continuing to run their Architectural
Practice, engaging and
managing trades as required over the Covid disrupted build programme.
Grand Designs project
The mill transformation began in January 2018 and is due to be completed in the spring of 2022. The four-year project was the subject of a Channel 4, Grand Designs programme lead by Kevin McCloud and was broadcast in autumn of 2021.
The Mill reconstruction gradually comes to life – the 90 sqm roof terrace will provide recreational space and stunning views over the surrounding tree canopy
The external combination of Lakeland stone and larch cladding blends beautifully with its surroundings.
ADF03_Icynene_Insulation_DPS-Adv.indd 3 ADF MARCH 2022
17/02/2022 12:15
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