Rafter Collar ties

Mmarquioreto · Nov 2, 2021

Hello everyone,

I'm trying to design some rafters' collar ties on a new roof. Rafters are 2x10 rafters @ 24" OC, and it spans 12.75'The roof pitch is 6:12. Collar ties are located 1/3 from the ridge board. Please see the file attached.

Can someone please help me to understand what the most effective method of sizing these structural members is? I want to understand how the manual calculations are done too. I highly appreciate your help and time in this matter.

Thank you so much.

Best,

Myla

BAretired · Nov 3, 2021

A word of warning. The purpose of collar ties is not well understood by many in the industry. They are not intended to replace rafter ties. See the following:
thread507-172305

https://www.nachi.org/collar-rafter-ties.htm

Mmarqueoreto said:
Can someone please help me to understand what the most effective method of sizing these structural members is? I want to understand how the manual calculations are done too. I highly appreciate your help and time in this matter.

1. It is not possible to understand how to size collar ties without understanding their purpose.
2. Do you have rafter ties at or near ceiling level?

BA

BAretired · Nov 4, 2021

Why do you ask a question, then clam up when you get a response?

BA

Mmarquioreto · Nov 14, 2021

BARetired,

Thank you so much for your help. The article was really helpful.

Best Regards,

Milene

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Rafter Collar ties

Mmarquioreto

Student

BAretired

Structural

BAretired

Structural

Mmarquioreto

Student

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