Dry Gap Barn

Dry Gap Barn

How to ensure a warm interior for the occupants within a barn subject to the extremes of the North Pennine weather.

tlx silver barn conversionDry Gap Farm Barn sits in an exposed position on the Pennine moors, and presents a modest exterior typical of isolated Pennine farmhouses. Inside, however, it is a gem of regional vernacular architecture, with three complete cruck trusses and other features that have remained largely unchanged since the sixteenth century, although the rafters themselves were installed last century.

Working with a building which is Grade 2 listed

The conversion to living accommodation has been prolonged: archaeological and bat surveys had to be carried out in 2009, along with a structural report. Although as a Grade II Listed building it is exempt from the insulation requirements of Building Regulations, the perceptions of what constitutes adequate insulation have shifted since then, so the owner was looking for a way to maximise the efficiency of the insulation build-up for his rafter depth.

Retaining authentic features

It also created unventilated air gaps above and below between them, which, because of the very low emissivity surfaces of TLX Silver (ε=0.05), minimises heat transfer by radiation. The result: a building retaining its authentic features, but now with a snug interior for the humans and an exterior that still provides a home for the bats.tlx silver multifoil labc registered detail loft conversion

The Solution: 

Multifoil insulation was used beneath 80mm of foiled rigid board insulation, achieving a U-value of 0.19 W/m2K. A condensation risk analysis was carried out by the TLX Technical Hotline staff to check that the recommended solution was suitable. Stapled to the underside of the rafters, it was secured with a 38mm cross-batten (which minimises the thermal bridging as multifoil insulation is only compressed where the battens cross).

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