squished air ducts!?

18 years ago

so the hvac guys are almost done...have the electricians in now as well and as they were going through and installing the can lights i noticed that they had to put a can in some areas that there was also ductwork between the tgi's. as you can imagine the ductwork looks as though its been squished to the side to allow the can proper placement. i would assume this will impede airflow to some extent but curious if anyone has run into this before. also noticed it looks as though some of the holes cut in the tgi's are quite a bit smaller than the ductwork is and you can clearly see how the ductwork gets smaller as it passes through the joist. can the ductwork be compressed a certain amount before it interferes w/air flow?

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Comments (6)

ryanhughes
18 years ago
I give up--what is a "TGI?"

It sounds like you have flexible (flex) duct. If this is the case, I'd really try to keep squishing and maneuvering to an absolutely minimum--this will affect airflow (to what extent I don't know). Talk to the HVAC contractors and electrical contractors to work this out. Have any pictures? If I can visualize this it'd be easier.
evans
18 years ago
TGI is an engineered beam

http://www.midwesthomes.com/standardspecs.htm
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mightyanvil
18 years ago
"TGI" is the acronym most commonly used by builders and developers to designate I-Joists even thought the manufacturers and industry organizations like the APA and the Wood I-Joist Manufacturers Association (WIJMA) do not use that term but simply call them I-Joists. "TGI" is probably a corruption of the "TJI" trademark of TrussJoist, the inventor of the I-joist.
Ron Natalie
18 years ago
TRUS JOIST is the proper spelling.
zl700
18 years ago
You don't mention if it is flex duct or galvanized sheet metal

If it is metal, they make oval pipe so, unless it is more than ovalized and pinched off, IÂm sure youÂre OK.

If it is flex duct with insulation, depending on whether itÂs R-4, R-8 or more, it can have up to 2" of wall insulation that may be compressed and that is what you are seeing. Inside is a pretty durable spiral wire wrapped vinyl that keeps its shape fairly well.
mightyanvil
18 years ago
TJI joists, Microllam beams, and Parallam beams are now part of Weyerhaeuser's iLevel product line.