By R. M. Lawson, Steel Construction Institute (Great Britain)
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Extra info for Over-cladding of existing buildings using light steel
The following three projects illustrate the range of over-cladding schemes that have been carried out in Finland. 1 Water tower, Raahe A tall stone water tower originally built in 1956 in the small town of Raahe in northern Finland underwent a complete transformation in a little more than 6 months in 1993. A series of 11 new floors was added around the tower to create new apartments. The terrace on top of the tower was replaced by a restaurant constructed in steel framing. A new staircase, a lift shaft, and balconies were added externally.
Installation of an over-cladding and glazing system on the example block would lead to predicted savings in carbon dioxide emissions of about 259 tonnes per year. C As part of an over-cladding improvement scheme, it may be possible to provide a new pitched roof above an existing flat roof. In addition to reducing heat losses and so further reducing energy use, this can provide new habitable space which may be used for communal facilities, or as new dwelling units with additional revenue. C The common alternative to over-cladding an existing block is to demolish it and replace the dwellings.
This heat is removed from the cavity either by conduction through the over-cladding panel, or by air movements through the cavity due to wind pressures or the “stack effect” (that is caused by temperature differences between the air within the cavity and the outside air, resulting in a pressure difference across the separating surface). Created on 30 22 March July 2009 2011 This material is copyright - all rights reserved. Use of this document is subject to the terms and conditions of the Steelbiz Licence Agreement The data indicates that, in addition to air movement in the cavity due to wind, which seems to be small, significant air change rates between the cavity and the outside air are thermally induced by the stack effect.
Over-cladding of existing buildings using light steel by R. M. Lawson, Steel Construction Institute (Great Britain)