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Old 08-29-2012, 08:11 AM   #31
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building 18x18 cottage need help 12 12 rafters


16' 2x12's will do!

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Old 08-29-2012, 08:12 AM   #32
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building 18x18 cottage need help 12 12 rafters


Thanks for all your help. I appreciate it.
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Old 08-29-2012, 08:13 AM   #33
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building 18x18 cottage need help 12 12 rafters


If you are going with collar ties and not a beamed ridge than make sure they are atleast 1/3 the way down the rafter for support.
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Old 08-29-2012, 08:17 AM   #34
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building 18x18 cottage need help 12 12 rafters


Which should be about 14' off the floor, but then again your plan will(should) show that.
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Old 08-29-2012, 08:29 AM   #35
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building 18x18 cottage need help 12 12 rafters


Hammer,

no offense intended by my comments, trying to clarify the difference between collar ties and rafter ties .....

if dwift does not install a structural ridge beam or ceiling joists he would be required to install rafter ties which would be located in the lower 1/3 of the rafter. Rafter ties are typically installed at a minimum of 48" o.c. and are sized based upon the tension load they must resist.

collar ties which are typically located in the upper 1/3 of the rafter are installed to secure opposing rafters so that a high velocity wind perpendicular to the ridge (which will create a lower pressure on the leeward side of the roof) will not lift/pull the leeward rafter away from the ridge. You can use a metal strap tie installed on the exterior side of the roof sheathing that is attached to the opposing rafters to prevent this lift/separation in lieu of collar ties.
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Old 08-29-2012, 09:01 AM   #36
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building 18x18 cottage need help 12 12 rafters


No offense taken Gary, one thing you learn in this business is you can always learn something. Not quite the way it's done where i am but interesting read.

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