[Hap-users] roof / attic

2 posts / 0 new
Last post


If you have an unconditioned attic space not functioning as a plenum, is it correct to model the roof and ceiling as one layer? That is, can you assume all heat gain / loss through the roof is also transmitted to / from the space? I would assume not since air is an insulator, however treating the ceiling as a partition & guessing the attic temperatures at outside design extremes is too much of a wild guess in my opinion.

Any comments on this would be appreciated.


EEA Consulting Engineers
Austin, TX

NOTE: This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please delete. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the company. Finally, the recipient should check this email and any attachments for the presence of viruses. We accept no liability for any damage caused by any virus transmitted by this email. | EEA Consulting Engineers

lyantis's picture
Joined: 2013-02-13
Reputation: 0

Usually the attic is ventillated. I assume it to be a partition load , just
to be on the safe side.

varun kulkarni's picture
Joined: 2011-09-30
Reputation: 1