I'm working on a new construction project and I had been spec'd all ceiling vents (2 story house) w/ two S9V2 furnaces (connected to heat pumps as primary, gas backup) located in a 2nd floor mechanical room. The contracted plan was one unit will run a trunk line through the attic that would be deep buried in insulation and the other one run the trunk through the 2nd floor subfloor so that everything is in "conditioned" space (I know the attic isn't technically conditioned but deep bury in R49 counts I guess). This is essential because I need that for the energy credits (WA state).
However, when I went onsite the HVAC installer had run the line down into the crawlspace and added floor vents. This causes me to fail energy code and the GC was not aware the HVAC would make this change on the fly. They are offering to redo it free-of-charge. However, they are saying they cannot fit the trunk line through the subfloor and would have to soffit down 14" in a particularly visible part of the house (ruins aesthetics). I have 16" open web floor trusses and am confused how this could be possible as this was supposed to be the original design (w/o any soffit). Does anyone have any insight on this and if there are any creative solutions that could avoid the soffit? Also, any suggestions on questions or actions to take? I'm still waiting on getting more information from the GC. Aren't 16" open web trusses the standard way to enable running trunk lines through a subfloor w/o soffiting?
However, when I went onsite the HVAC installer had run the line down into the crawlspace and added floor vents. This causes me to fail energy code and the GC was not aware the HVAC would make this change on the fly. They are offering to redo it free-of-charge. However, they are saying they cannot fit the trunk line through the subfloor and would have to soffit down 14" in a particularly visible part of the house (ruins aesthetics). I have 16" open web floor trusses and am confused how this could be possible as this was supposed to be the original design (w/o any soffit). Does anyone have any insight on this and if there are any creative solutions that could avoid the soffit? Also, any suggestions on questions or actions to take? I'm still waiting on getting more information from the GC. Aren't 16" open web trusses the standard way to enable running trunk lines through a subfloor w/o soffiting?
source https://hvac-talk.com/vbb/threads/2243994-Open-web-trusses-and-trunk-lines?goto=newpost
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