Download H+H Calculated Ψ-Values
Request the latest H+H Calculated Ψ-value tables, checklists and construction details to support SAP calculations, Part L compliance and energy-efficient masonry design.
Developed by H+H’s technical team in accordance with BR497 guidance.
Submit your request below and we’ll provide you with a link to download the latest H+H Calculated Ψ-value resources.
Free to Use for H+H Projects
H+H Calculated Ψ-value Tables, Checklists, Drawings and Descriptions are the intellectual property of H+H UK Ltd and are protected by copyright.
These resources are provided free of charge for use in the design, energy assessment and construction of projects using H+H aircrete blocks.
Using These Resources
H+H Calculated Ψ-value resources may be incorporated into project drawings and specifications but must not be copied, reproduced, published or used for any other purpose without the prior written consent of H+H UK Ltd.
These documents are reviewed and updated periodically. Users are responsible for ensuring they are using the latest version by checking the H+H website or contacting our Technical Team.
What the document will provide
Standards
The calculations conform to both BR497 (2016) and IP 1/06 and have been prepared in-house by our Technical team. Evidence of competency and relevant training can be provided on request.
SAP Ready
These calculated Ψ-values may be used by energy assessors in their SAP calculations to take full advantage of the inherent benefits of H+H aircrete blocks for all parts of the building fabric. T
H+H Specific
Specific to, and only valid for use with, the named H+H aircrete blocks and will be updated to reflect any changes to product specification as necessary. Consequently, they should not be used for other aircrete blocks of apparent similar specification.
Current Version: Revision B, March 2026.
This version now contains the following additional wall insulation options for all existing junctions:
Full fill rigid insulation options at 0.019, 0.022 and 0.030W/Mk for 100, 125 and 150mm cavities.
All insulation thicknesses assumed 10mm less than the cavity they are built in to provide a residual 10mm air gap. New 0.019W/mK partial fill insulation options added for 100, 125 and 150mm cavities.
Further Details
Further details of complete changes may be found under Revision Notes on page 2 of the document.