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KShirriff 10-04-2012 09:39 PM

Ceiling joist
I am installing ceiling joist upstairs and connecting to a cathedral ceiling.The ceiling joist are 2x6 running 13' on 16" centers. I need to connect to the cathedral ceiling joist that are running the opposite direction at 8' span. Do I need to create a header beam to tie these joist together. If so, what size? Rule of thumb is 1" per foot. Would that mean a 2x8 doubled up with 1/2" OSB be sufficient?

Gary in WA 10-06-2012 08:26 PM

Welcome to the forums!

This is where a picture or three would help;


Daniel Holzman 10-06-2012 08:30 PM

Except for certain very common headers (yours does not sound like a common header), headers are generally designed for the specific load imposed on them. The subject of how to determine load on a header has been discussed many times on this forum, you may want to do a search. Sometimes the lumber yard that supplies the glulam or lvl beam (if that is the type of beam you use) will incorporate the cost of engineering the beam into the price of the beam, so you can avoid the need to hire an engineer or architect.

KShirriff 10-07-2012 08:30 PM

Well.. both ridges are supported with LVL beams, I'm just trying to frame a ceiling below the beams, tying the ceiling joist into the 2x8 rafters. But my concern is, can I tie the 2x6 joist together when the front A-Frame ceiling joists are running East to West and the back ceiling joist are running North to South. How do you tie that together?

GBrackins 10-07-2012 09:27 PM


where are you located? I ask because typical energy code requirements can be difficult to meet in parts of the country when using 2x6 rafters.

I agree with GBR, a few photos would certainly aid in your case.

DannyT 10-07-2012 10:13 PM

in western ny 12 foot is maximum for a 2/6 for a ceiling joist.

KShirriff 10-08-2012 09:21 PM

One shot
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KShirriff 10-08-2012 09:23 PM

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KShirriff 10-08-2012 09:25 PM

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KShirriff 10-08-2012 09:27 PM

I plan on spray foaming the roof and walls. This is in Alabama, so there is not a snow load and I am not using the attic space for storage.

AndyGump 10-08-2012 10:00 PM


Originally Posted by KShirriff (Post 1026977)
I plan on spray foaming the roof and walls. This is in Alabama, so there is not a snow load and I am not using the attic space for storage.

Dang man, if I had your money I would burn mine.


hand drive 10-09-2012 09:37 AM

What I would do is try and get an upsized double ceiling joist tied to the double valley rafter somehow and then use joist hangers to hang the remaining fill in joists in the center off of the double joist. Also, use the center post and tie a couple of the joists on the hangers to it on either side as they cross it. Getting the cut right where the double hits the valley rafter is the hardest part...

GBrackins 10-09-2012 09:51 AM

is that a built-up column under the end of the ridge beam in photo 1? has anyone calculated the column requirements or did they just nail some 2x's together? I ask because the column appears to be quite tall and does not appear to be laterally braced anywhere between the top and bottom of the column. Depending on several factors such as column material, fasteners to join built-up column, column cross section area, column height and load supported it may or may not be stable. Last thing you'd want is for the column to buckle.

Not questioning anyone knowledge or abilities, just asking a question in case it was overlooked.

KShirriff 10-09-2012 07:21 PM

Yes it is a built up post. It is four 2x4's 11' long supported on the 2nd floor with a LVL beam below that.What should I do there? Can I beef it up?

KShirriff 10-09-2012 07:24 PM

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