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The span of roof glazing is classified as the downslope dimensions between the centre-lines of the fixing positions rather than the glazing bar length which is always longer than the span. Achievable spans are dependent upon many factors, including: We are able to carry out a free job specific calculation on every project to ensure that the glazing bars we provide can be proved to be sufficiently robust enough to withstand all possible loadings that the system will be subjected to.
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Maximum glazing bar spans stated in the charts contained on this page are based on a generic site close to sea level, 30km away from the sea, 5m height of glazing from ground level, a duo-pitched roof shape, a 15°roof pitch and glazing bars being spaced at 600mm centres.
Single glazed data is based on a 6mm thick glass infill whereas double glazed data is based on 2x6mm thick glass infills. Any deviation from these variables can significantly alter the maximum achievable span so please do contact us for expert guidance of this subject.
On deep glazing (slope lengths over 3200mm) a structural intermediate purlin (by others) is usually introduced into the design at the mid span position to enable a lighter glazing bar section to be used. Because glass over this length is not available in a single peice as standard, a convenient and common place to join the glass is over the intermediate purlin.
Our aluminium glazing bar ranges are available in lengths up to 6000mm-7500mm but will require intermediate support at these lengths.
Tiered Heritage Patent Glazing Tiered Detail and Image | ||
please note that due to the manufacturing process of our Heritage Lead Clothed Steel glazing bars, we cannot supply this product in lengths exceeding 3350mm (11'-0") regardless of whether intermediate supports are provided. If a Heriatge glazing bar is required to exceed this length then the design must incorporate a break/tier to overcome this limitation (see above).
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