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-   -   Bridging ceiling joists (http://www.diychatroom.com/f19/bridging-ceiling-joists-137210/)

Sully5455 03-16-2012 09:55 AM

Bridging ceiling joists
 
Mid 80's rambler- 2x6 top and bottom chords on stick built rafters w/ 2x4 webbing. I want to remove some interior wall to open the main living area to an open great room. HOW DO I BRIDGE ABOVE THE CEILING JOISTS? It will be 24' clear span for 13' of the living area. I am told the rafter design affords the ceiling joists carry ceiling load only and not roof load down to the wall I want to shorten.

Daniel Holzman 03-16-2012 11:53 AM

I really did not understand your post at all. So let's start from the beginning. You say you have 2x6 top and bottom chords with 2x4 webbing on stick built rafters. The term "chord" usually refers to a truss. Stick built rafters are not generally trusses. So we need to start by establishing if you have trusses or conventional rafters. A few decent photos would help immensely. If you are not familiar with the difference between a truss and a rafter system, the truss is generally prefabricated triangular elements, often 2x4's, usually put together using gang nailing plates (unless it is a home made truss). Rafters are commonly 2x6 or perhaps 2x8, attached to a ridge board at the top, and usually nailed to the floor joists on the wall.

I do not understand what you mean by the words "bridge above the ceiling joists". Maybe post a picture, or try explaining exactly what it is you want to accomplish. Bridging usually refers to horizontal blocking between joists, I am relatively confident this is not what you are talking about.

Then you refer to removing "some interior wall". Is this a load bearing wall, or are you not certain if it is load bearing? Post a picture. Generally trusses span full width between outside walls (not always), and require no interior support. Ceiling joists, on the other hand, are often supported near the mid point using a bearing wall.

Joe Carola 03-16-2012 04:34 PM

Quote:

Originally Posted by Sully5455
Mid 80's rambler- 2x6 top and bottom chords on stick built rafters w/ 2x4 webbing. I want to remove some interior wall to open the main living area to an open great room. HOW DO I BRIDGE ABOVE THE CEILING JOISTS? It will be 24' clear span for 13' of the living area. I am told the rafter design affords the ceiling joists carry ceiling load only and not roof load down to the wall I want to shorten.

There are no top and bottom chords in a stick built roof.

Sully5455 03-17-2012 11:53 AM

Boys, I could not explain it any better. I never used the word truss they are rafters w/ ridge board. But due to the heavy snow loads where I live (I assume)they put webbing from center of building at the ceiling joist and angled them to center of the rafter boards on each side (this was done every 4' the rafters are 16" oc). Im thinking of engineered 2x12's (2 of them) on top of the ceiling joists strapped to the joists(a strong back as you will). Basically I want the beam above the joists to allow for a clean flow across the ceiling w/o the beam showing in the living area.

Sully5455 03-17-2012 12:00 PM

I know that I need to start at the foundation to allow any change in loads up top be properly transfered through and down to the foundation without adding thrust to walls.

Joe Carola 03-17-2012 12:20 PM

Quote:

Originally Posted by Sully5455 (Post 879563)
Boys, I could not explain it any better. I never used the word truss they are rafters w/ ridge board.

Sully,

Just so you know, buy using the word chord, you are referring to a truss without saying the word truss.

Sully5455 03-30-2012 11:44 AM

Daniel, have you formulated an idea of how to open the ceiling with the above joist beam? I do appologize for my shortness earliier my ex husband was nagging me. I do thank you for any and all help in this matter.

Daniel Holzman 03-30-2012 11:50 AM

Maybe I was not clear. I DID NOT understand what it was you are trying to accomplish. I suggested that you post pictures. Without pictures I certainly cannot steer you in any direction. Remember, this is an internet forum where NO ONE has seen your house, and it is difficult, frustrating, and time consuming to speculate about how to accomplish something without a really good description of what you have to start with, and what you want to end up with. And pictures. There are plenty of people on this forum with lots of framing and design experience, they will be happy to help out, but we have to understand exactly what it is you want to do.

Sully5455 04-12-2012 02:58 PM

Roof framing Photos
 
4 Attachment(s)
I hope this will help you understand what I have and what I would like to do.

Sully5455 04-12-2012 03:05 PM

diagram
 
1 Attachment(s)
sorry skipped one

cleveman 04-12-2012 10:13 PM

I want to hear what feedback you get from those photos.

cleveman 04-12-2012 10:15 PM

Looks like your bearing wall is offset from the center. Nothing wrong with that. So you should be able to eliminate your hallway wall which is not under the bearing point (where the ceiling joists come together and rest on a wall).

Sully5455 04-13-2012 10:54 AM

What do you think about the four feet i want to remove from the kitchen/dining area?

cleveman 04-13-2012 11:34 AM

Looks like you can remove anything which isn't under the bearing wall.

Sully5455 06-22-2012 08:22 AM

Beam/Header size
 
How big of beam will be required under the ceiling joist lap for a twenty foot long opening?


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