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Old 05-30-2014, 07:25 PM  
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Default rafter cable ties

I cant understand this math. ive been over and over it. Each time I get a little further, then I loose it again.

How to calculate rafter thrust? -Help! at

Can someone help me figure cable load?


24" rafter spacing.

No rafter ties at all. A few existing collar ties.

ceiling joists run parallel to ridge.

house is 27' x 30'(ridge).

7/8" roof planking and asphalt shingles.


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Old 05-31-2014, 02:37 PM  
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You might need an engineer for that but (and it's only a thought) If the ceiling is running in same direction, the whole thing is held together with 3 or 4 nails where the joist attach to the outside wall. So what is the shear strength of 8 3" nails
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