Hi William,

Thank you for the feature request. The current version of ACCA Manual J Eighth Edition Version 2 published in 2011 does not have tables that accomodate R-Values past R-38 for ceilings (unless they are below an attic). However, the next version of the book is currently out for public review and it appears to allow custom R-values that are higher than the max values in the ACCA tables. I suspect that version will be released early next year and at that time we will have 90 days to make our software compliant.

Best Regards

Bill