Rafter ties for cathedral ceiling


  #1  
Old 04-25-00, 01:23 PM
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I have just built a 12'X 16' porch over my patio. I put a gable roof attached back to my existing roof.

I made the rafters myself, (2 X 6, 16" O.C.), and have a rafter tie for each rafter (2 X 6 X 16).

My Question, my wife wants a cathederal ceiling on the porch. I saw a design one time with a similar layout that had only 2-4x6x16 ties to hold the walls together.

What is required/needed to hold the load bearing walls togther on a cathederal ceiling?
 
  #2  
Old 04-25-00, 03:02 PM
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first where are you ? check code for your area. It's easy to do call the building inspectors office they will tell exactly what you need
 
  #3  
Old 04-25-00, 06:35 PM
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Are your existing rafter ties really ceiling joists?

How high does your wife want her ceiling to be?

I don't know the pitch of your roof, but if your rafters are longer than 13' I would most likely use 2x8 collar ties, though the 2x6 "might" work. Depends on local code.

What are the load bearing walls other than the exterior walls?

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[This message has been edited by More than a Carpenter (edited April 25, 2000).]
 
  #4  
Old 04-25-00, 07:32 PM
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quote:<HR>Originally posted by More than a Carpenter:
Are your existing rafter ties really ceiling joists?

How high does your wife want her ceiling to be?

I don't know the pitch of your roof, but if your rafters are longer than 13' I would most likely use 2x8 collar ties, though the 2x6 "might" work. Depends on local code.

What are the load bearing walls other than the exterior walls?

<HR>

My existing ties were put up as ceiling joist. My rafters are about 10' each (total span 16' with both rafters).

The load bearing walls are just 2X8 (2X4 top plate) with 4x4 post every 3' 6".

I haven't enclosed it in yet. Just using it for cover right now.

 
  #5  
Old 04-28-00, 09:09 PM
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How tall are your walls and what is the height to the bottom of your ridge board?

Depending on what these measurements are and how high you would like to make the cathedral ceiling, I would make some suggestions to/for you.

Regardless of whether you use 2x6 or 2x8 I would strongly recommend using a triangle piece of 1/2" or thicker CDX plywood on each side of the rafter and above the tie. You would be making trusses. Do this before you remove the joist.

The joist is bracing your walls plumb. Do not remove until the truss is complete. You can remove one at a time.

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MTAC - Van Buren,MO
www.carpenter.cjb.net
Home repair & Construction

"Where the character and work are always upright"

Anything worth cutting down a tree for, is worth doing right.
www.toolreview.cjb.net
 
  #6  
Old 04-29-00, 04:53 AM
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I would just make dutch rafters, and your problems are all solved.

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  #7  
Old 04-29-00, 06:54 AM
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Excuse my ignorance, but, what is a "dutch rafter"?
 
  #8  
Old 04-30-00, 03:49 AM
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A dutch rafter is the style of rafter you use for catherdral ceilings. There are a couple of other names for them but this is the most common.

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Jack the Contractor
 
 

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