I am wondering if a heavy timbered ridgebeam, such as a 4×10, will eliminate the need for collar ties?
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Yes, depending on the connections between rafters and ridge.
But I think you mean rafter ties, rather than collar ties. Collars are in the upper third of the rafter to tie against a hinging up lift in high wind. Rafter ties are in the lower third or as cieling joists to prevent the spreading action induced by ooutward thrust from roof loads.
When the ridge beam is engineered and installed to be able to support half the loads of the roof, ( the other half being borne by the walls) then no outward thrust is developed and the structure is stable.
The beam must be sized correctly, and supported to foundation.
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Edited 12/4/2004 1:01 pm ET by piffin
Sure. That's how cathedral ceilings are built.
As the Piffmeister said, the beam needs to sit on posts or other supports that transfer the roof load to the foundation. If you use a LVL's, your supplier can get you in touch with the manufacturer and they can size the beam for you. Your inspector (as mine did) may want to see hurricane clips at the rafter/wall connection.
Al Mollitor, Sharon MA