Soffit issue

kaljr82February 4, 2014

So here is the scenario.
I am finishing my basement and we have our main HVAC trunk line running right down the middle of the house along side the steel support beam. It spans just about 6 feet.

I need to build a soffit around it and am kind of stuck on what I should do. I am really wanting to be able to run the bottom 2x4's on their side to maximize headroom but the span seems pretty far for this application. There is plenty of spac about 2 feet in on on side to add some 2x4 for support, so really the longest span would be about 4 feet.

Thoughts??

One thing to keep in mind is I do have a bedrrom foor framed in under the ducts and only have about 2.5 inches from the bottom of the trunk line to the inside of the top door plate.

You think I could get by running the 2x4's on their sides? What if I added a layer of 1/2 inch osb between the framing and drywall?

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geoffrey_b

Built a 2x2 "ladder", attach it to the joists, and then run 2x2 or 2x4 to span between the 'ladders'.

Otherwise, a picture would help.

    Bookmark   February 4, 2014 at 11:45AM
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kaljr82

Picture 1

    Bookmark   February 4, 2014 at 11:50AM
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kaljr82

I have another picture coming.
I really just need to know if I would be fine spanning the width with 2x4's laying flat, or if I need them standing on edge for support? In order to not have to worry about a retrofit for the bedroom door, I really need them flat, but don't want to risk sagging in the future.

    Bookmark   February 4, 2014 at 11:52AM
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geoffrey_b

My thought is you should build 3 2x2 ladders. One to the right of the ductwork, one ito the left - between the duct and the pipes, and one left of the I beam. That will give you a support sorta in the middle - then a 2 x 4 laid flat would not sag.

I cut all the 'rungs' on the table saw at once - with the same rip fence setting. Then screwd them together. Just make sure the rungs don't fall on a joist so that it would interfere with attaching it to the joist.

Use a 2x4 16" OC - and attact the drywall.

    Bookmark   February 4, 2014 at 1:45PM
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renovator8

If the framing is only supporting 1/2" drywall over a 4 ft span, 2x4's turned flat should be more than strong enough.

    Bookmark   February 8, 2014 at 5:21PM
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