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Old 04-28-2010, 10:53 AM   #1
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Slim Soffit for Ductwork in Basement


Do to an upcoming addition, I need to reroute the ductwork for my bathroom exhaust fan and for my dryer exhaust, both 4" round metal duct. I don't have a lot of options for where to run the ducts given that 1) I live in a rowhouse, so only two exterior walls, 2) the ducts can't be longer than 25', 3) the ducts can't exhaust within 3' of any windows or door. As such, I need to run the ducts perpendicular to the ceiling joists and must build a soffit.

I am looking for some advice on how to build the slimmest, lowest profile soffit possible. The soffit needs to run along the basement bathroom ceiling, so I would like for it to be attractive and small as possible.

So, I would love advice on the following (or anything you think is helpful)

1) Where should I locate the soffit in the bathroom to be most attractive and least obvious? I have included a drawing of the bathroom. Because of windows and door, it would be best for the vents to exit somewhere in the vicinity of the tub. Also, it is a tub/shower.

2) How can I build it to minimize its size. If I use 2x4 or 2x3 material, it's going to be big!!

3) How much space do I need to leave between the two ducts to make sure I will be able to terminate them on the outside?

Any other thoughts or ideas would be VERY much appreciated!!
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Old 04-28-2010, 01:47 PM   #2
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Slim Soffit for Ductwork in Basement


.Minimize Size?
Use
" Luan plywood for the field and chamfer moulding trim as inside edge supports to box in the Luan. You will need a brad nailer to assemble this without going crazy.

Space between Ducts?
Run them side by side, then branch off one duct a foot or so from the exit outside wall.


http://americanchamfer.com/chamferandmoulding.asp
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Old 04-28-2010, 02:00 PM   #3
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Slim Soffit for Ductwork in Basement


Awesome, awesome idea, will it really support drywall though?

Also, is it ok if I channel out the existing drywall so that the soffit and the ductwork run right along the joists? This would gain me AT LEAST .5", but I believe the basement ceiling has been furred down, so it could gain me 2". If I do this, are there any special precautions for firestopping?

Last edited by stubits; 04-28-2010 at 02:23 PM.
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Old 04-28-2010, 03:46 PM   #4
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Slim Soffit for Ductwork in Basement


No Drywall but use thin Luan plywood. If it was me I would probably instead of Luan use 1/8" Luan sheets ripped down to the height and width that I need.

As far as firestoping I would call your local Building and Safety Office to see what is required. Most basements that I have seen, have exposed joists.

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Old 04-28-2010, 03:48 PM   #5
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Slim Soffit for Ductwork in Basement


Hmm, this will need to be drywalled as the rest of the basement is drywalled and we use it as real living space. This was a great suggestion, but I am not sure if it going to work in our situation.
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