calculated that this cavity wall specification will achieve a ‘U’ value much lower than required by legislation, being almost twice as effective at reducing heat loss. PIR board insulation can also be used to line walls internaly or externaly. This may be used as a solution for insulating solid walls or timber frame structures.
A 200mm cavity requires the use of extra long wall ties which tie the inner and outer block skins together. Various types of extra long wall tie are now available. Here we are using basalt fibre based ties, which have very low thermal conductivity, this further reduces potential cold bridging.