Homestar Technical Clarification Rulings
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| Technical Question Title | Tool Version | Date Released | Credit Name | Tool Category | TC Link |
|---|---|---|---|---|---|
| TQ210 Cresco Waffle Suite Software | v4.1 | February 2024 | EHC1 - Thermal Comfort | EHC | Link |
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Approved Ruling: The request to use the Cresco Waffle Suite Software to calculate the R-value of the R-value of the Firth Xpod Foundation system (Plastic Dome / air void spacer) in place of using the ‘Generic Slab / solid concrete foundation’ as per the Homestar V4.1 Manual page 197 which states "If the core is air-filled, treat as if solid concrete’ is denied. The Cresco website states that “Wafflesuite™ is a software that runs calculations of waffle rafts in compliance with AS2870 Appendix F.” [1] and the Australian standard website states that AS2870 Appendix F - (informative) deals with the soil structure interaction analysis for stiffened rafts. This is structural engineering software rather than thermal modelling software and it is unclear if this software can calculate ground temperatures from slab geometry or uses ISO13370 to estimate ground impacts on heat loss or accurately model 3D heat loss in accordance with EN ISO 10211. Whilst the Wafflesuite calculation methodology does include reference to ISO13370 in section 5 on page 27 it merely states that “a layer of coarse-grained compacted engineered fill that is placed immediately under a waffle raft foundation may be modelled in a thermal analysis conducted in in accordance with ISO13370” not that this modelling has actually been undertaken in accordance with ISO13370. The reference to ISO 6946 is in section 5.2 on page 28 and states “when foil insulation is used, the compliance with building code is demonstrated via an alternative solution (ISO6946)”. Again not that modelling of the specific product has occurred in accordance with this ISO standard. In addition foil insulation is banned for use in New Zealand. [1] https://www.cresco-group.com/driving-innovation/ |
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