ROOFING: CASE STUDY
SCOTTISH FARMSTEAD CHARACTER PRESERVED
Specifying the right materials isn’t just a matter of gettig the performance right. It can be just as important to retain the feel and character of a refurbished building, as BMJ finds out.
A
e original building comprising farm steading and offices dating back to around 1856 has been redeveloped , still retaining much of the original character. In 2017 the buildings were purchased by Jason Stewart of Circinn Developments Dundee with plans to convert the site into two buildings consisting of one 2-bedroomed and one 3-bedroomed unit. The roject used Roofshield Breather Membrane from th A. Procter Group. Many vapour permeable underlays use an airtight VP film layer to achieve their performance, whilst Roofshield’s patented SMS (Spunbond Meltblown Spunbond) structure allows high levels of airflow, in addition to the transport of moisture vapour, making the formation of condensation in the roof space virtually impossible. It has an extremely high degree of vapour permeability, as well as air permeability, so will still perform in conditions in which air tight alternatives will not without the need for ventilation to the roofspace.
The recent changes to BS5534 the British Standard for Slating and Tiling continue to strengthen the case for Roofshield as a high- performance non-ventilated roofing solution.
Underlay issues
Increasingly leading housing developers backed by the NHBC, and independent industry
research, agree that some underlays perform at an exceptional level, providing a failsafe option, without the need for additional ventilation. Roofshield, being both air and vapour permeable, means developers are seeing savings in labour and material costs, due to the fact that no VCL is required. Plus, the high-performance air permeability means that the roof space has similar air changes to that of a roof using traditional eaves/ridge ventilation. Stewart says: “it was important to maintain a strong traditional character to the buildings, preserving the stone finish exterior and slate roof. As part of the roof construction, we specified the Roofshield membrane to ensure the highest level of protection. We have used Roofshield on a number of projects and it is excellent in terms of its weather tightness, where
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some cheaper alternatives can tend to sag in the gaps between sarking boards, causing water to collect and create the risk of leaks. It’s also extremely robust so you don’t have to worry about tearing or damaging on site. In fact, Roofshield was in place during Storm Hector with wind speeds in parts of Scotland registered at up to 100mph and it remained firmly in place.”
Steadings form part of the history of the agricultural background of the country and are a legacy and connection with our past. All too often modern farmstead conversions can end up destroying any signs of the original character. In the case of the Westmarch Steading, an excellent balance has been maintained between the old and the new resulting in a traditional look and feel to the buildings. BMJ
www.buildersmerchantsjournal.net November 2018
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