Junction ψ-values and f-values (walls with partially filled cavities)
Thermal bridging ψ-values and f-values for walls partially filled with PU thermal insulation.
The models given in this document cover:
Ultralightweight aggregate blocks with λ not exceeding 0.28 W/mK
Lightweight aggregate blocks with λ not exceeding 0.60 W/mK
Dense aggregate blocks with λ not exceeding 1.33 W/mK
SAP 2012 approved and default ψ-values should be applied to each dwelling.
- See individual CBA details for guidance on allocation of calculated ψ-values to dwellings at a junction.