Reply by Charlie

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Posted on Any framers out there - need to cut a ceiling joist

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1100 posts in 2314 days

#1 posted 07-14-2012 11:43 AM

Ceilings are 7’-8” from floor. That’s part of the problem. All of the island hoods seem to assume everyone has 8 ft ceilings as a minimum. There’s a minimum distance the manufacturers want you to have from the cooktop. Then there’s a measurement of exactly how short you can make the entire assembly. Most are around 31 inches. If I have a range hood hanging 31 inches from the ceiling, then according to the manufacturer, it’s too close to the cooktop. The bottom of the range hood would be at my chin. Sounds like a head banger to me. I know on many of them I can shorten the stack by cutting the legs of the support tower and taking the stainless duct covers to a metal fabricating shop to have them shortened. But…. seriously?

Anyways, I found a brand new one from Kobe that has both a short duct AND would meet the clearance-from-cooktop requirements of the manufacturer and ME. We’re going to open the ceiling either way, but there’s a scuttle in the garage that accesses the space. “Access” is a tricky term here as there’s only 18 inches of headroom at the peak and the range hood is only about 5 or 6 feet from the eaves. Anyways, I’m going to try to slide some 6 inch duct over the top of the insulation to get from the scuttle to the range hood. About 12 feet. The idea is that if I have to penetrate the roof, I’d rather do it over the garage AND in a place where I have access to inspect/maintain if necessary. If I have to penetrate directly over the range hood, there’s a possibility I’d have to open the ceiling again if there are any issues at all (a leak, re-roof makes it need reconnect, whatever)

The issues with this are: #1 Can I feed a 4 ft section of 6 inch duct through the scuttle. (I think I can, but I’ve been wrong before.) – if yes, great. If no, this whole idea stops and I have to penetrate over the range hood. #2 will an INSULATED 6 inch duct fit into that “pinch” space where the ceiling joist and roof rafter are closing in on each other. If I can slide the duct without insulation over to the hole in the kitchen ceiling, then I’d pull it back to the scuttle and start sliding an insulation sleeve over it and push it back to the hole.

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