Conclusions

Conclusions
For a new calculation method to better represent real SPF values there is a need to rely on consistent sets of performance data acquired from lab testing. These lab testings guarantee consistency, repeatability and reliability.  
If the objective is to give better values for individual houses, more details on the building envelope, climate data etc. must be provided for the specific setup.  
If the objective is to give reliable values for typical conditions, type houses in type climates should be used, but with better details than currently used in existing model