Old 03-26-11, 10:05 AM
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I am going to be pulling down my ceilings in my ranch as they are low and go cathedrel. This is in the living rome and kitchen. I am going to put in two collar ties as I will be taking part of the carrying beam out . I have added three sky lights a few yrs back when the roof was done, At this time there the roof I believe has only 2x6 rafters, What should I scab aside them either 2x10's or eights, I liv ein the NE
Old 03-26-11, 12:49 PM
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You should get an architect/engineer to sign off on your plans. The permit office will likely require it but more importantly - you need to know that your proposed plan will be safe! If it isn't, the engineer would be able to tell you what needs to be done structually to make it safe.
Old 03-26-11, 01:43 PM
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I agree with marksr. Get professional direction on this. To add collar ties at the rafter's top 1/3 height will not give you the wall spreading resistance required, unless designed by an Engineer familiar in rafters. You also have snow loads to factor in with your location. The rafters should rest on a solid wood, engineered lumber or steel ridge beam, not a ridge board as you probably have now; Graphic guide to frame construction ... - Google Books
I see a future problem with venting the closed roof cavities at the skylights to prevent ice dams unless you properly add venting (or go unvented roof assembly). You need the Engineer to properly size the beam, posts, and concrete footings for the change-over, along with the fasteners, strapping, and bolting required. Be safe, get help here.


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