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2.13 Alternative wall

Solution In determining whether an alternative wall is applicable the significant features are construction type, age band and insulation. Walls of the same construction but different thickness within a building part are not considered alternative walls unless they are stone walls. For stone walls assess thickness at each external elevation and at each storey and use alternative wall if the thickness varies by more than 100 mm, see also 2.22. Disregard when less than 10% of total exposed wall area of the building part (including windows and doors) unless documentary or visual evidence exists of different retrofitted insulation either of the alternative wall or of the remaining wall in the building part. When entering alternative wall area into software exclude the area of any windows and doors contained in the alternative wall.
Consolidate walls of same type. If there are two areas of external wall of different construction types within a building part that should be regarded as alternative wall, review the way in which the property has been divided to try and eliminate this situation. Where that is not possible the alternative wall is the one with the larger area. In the case of the wall separating the dwelling from an unheated corridor or stairwell, where this wall is of different construction or insulation to the external walls (e.g. not insulated but external walls are), make it an alternative wall and mark it as sheltered.
Article details
Article ID: 248
Category: RdSAP Conventions for SAP 2009 v9.91 - Issued 6 January 2012 (v5.0)
Date added: 22-03-2013 10:03:15
Views: 1586

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