This paper illustrates the use of BS EN ISO 6946:1997 for some typical wall, roof and floor designs.
Future regulations, regulations, however, are likely to be based upon upon the method for calculating U-values defined in BS EN ISO 6946:1997, which includes the Combined Method for repeating thermal bridges and correction procedures for the effects of metal fixings, air gaps and unheated unheated spaces. At present, Building Regulations Regulations specify that U-values U-values should be calculated using the Proportional Area Method, which is described in the CIBSE Guide, Section A32. Introduction For building elements which contain repeating thermal bridges, such as timber joists between insulation in a roof, or mortar joints around lightweight blockwork in a wall, the effect of thermal bridges should be taken into account when calculating the U-value. Room in roof construction with limited rafter depthġ. Pitched roof with insulation between and over the joists Wide cavity wall with vertical twist ties
Insulated cavity wall with metal wall ties The procedures are explained explained using examples of U-value calculations for some typical wall, roof and floor designs which contain repeating thermal bridges.Ĭavity vity wall with with lig lightw htweight ight ma maso sonr nry y leaf leaf an and d insul nsula ated ted dry linin ining g © Building Research Establishment Ltd 1999Įxamples of U-value calculations using BS EN ISO 6946:1997 S M Doran and L Kosmina, BRE East Kilbride December 1999 This document illustrates the procedures given in BS EN ISO 6946:1997 1 for calculating the U-value U-value of opaque elements. Mrs H J Cuckow, Director, BRE East KilbrideīRE East Kilbride Kelvin Road East Kilbride Glasgow G75 0RZ Tel : 01355 576200 Fax : 01355 576210 Email : (revised June 2000) Final approval on behalf of BRE : Final approval on behalf of BRE: Signed _ _ _ Date Examples of U-value calculations using BS EN ISO 6946:1997 Prepared for: DETR/BR By: S M Doran and L Kosmina BRE East Kilbride Dec De cembe emberr 1999
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