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Published in Les Goring, Residential Surveying Matters and Building Terminology, 2023
Counter-battens: Figure 29: This term usually refers to timber battens (of a 50mm/2 in. x 25mm/1 in. section) that are used on pitched-roof surfaces that have been clad with sarking. This Scottish term refers to closely-fitted square-edged boards fixed over the whole raftered roof, to create a more solid structure for the roof-cladding. Sarking is thought to be mostly used in Scotland, but it can occasionally be found to have been used in other regions of the UK. However, apart from stabilizing a roof, sarking also adds a good degree of thermal insulation. Note that such roofs built prior to the early 1930s – unless they have been retiled at a later date – will not be overlaid with a waterproof fabric.
Specialist Ventilation Strategies
Published in Rodger Edwards, Handbook of Domestic Ventilation, 2006
The introduction of sarking felt as a means of eliminating the penetration of wind-driven snow served to drastically reduce the air-change rate within the roof spaces. Field measurements indicate that this reduction could be as much as 80%.3 This implies that there is much less tendency for any accumulated water vapour within a pitched roof space to be removed by ventilation.
Method for evaluating the snagging propensity of roofing membranes in buildings by roosting bats
Published in Building Research & Information, 2020
E. A. Essah, S. J. Russell, S. D. Waring, J. Ferguson, C. Williams, K. Walsh, S. Dyer, R. Raynor
During roosting, bats physically interact with the surface of roofing membranes through the gaps between battens and in the roof space (Figure 4). Their claws snag the surface of the NBCRM, which can cause loops of continuous filaments to be teased free from the fabric structure to produce surface ‘fluffiness’. Concerns have been raised since 2004 about the level of bat mortality (Waring et al., 2013; Waring, 2014) as they are often caught in these loose, strong filaments, becoming fatally entangled. In Scotland, this situation would not normally arise in the roof void as the membrane would be located behind the wooden sarking boards, against which the bats would roost. However, there is still potential for crevice dwelling bats such as Pipistrelle species to interact with the NBCRMs when roosting underneath roof tiles.
An increasing resistance to increasing resistivity
Published in Architectural Science Review, 2023
Aluminium foil as sarking and thermal insulation has had its application in Australia throughout its construction history (Renouf 2019). The abandonment of foil makes no scientific sense. With a proper understanding, every building product can have a correct application. As a case in point, construction with oriented strand board (OSB) is common in the U.S. even though this form of sheathing is very susceptible to mould growth. The solution was not to reject it outright, but to learn to use it with the appropriate protective measures (Lstiburek 2009). Foil has its place, especially as a radiant barrier for heat stress resilience, and when used in applications where combustibility is a safety risk that cannot be tolerated.