Cracks in roof rafters

smguo2001

Noticed some cracks in the middle of some of the roof rafters lengthwise:



Should I be worried? Do I need to sister them up?

tcleve4911

That is normal "checking" seen in large timbers.
They are not "cracking".
Just an aesthetic nuisance, not a structural issue.

oh'mike

Not a big concern--Those are known as 'heart checks'---The strength of the rafter is not compromised much by that.

If the checks reach the outside of the rafter then it's time to figure a repair.---Mike---

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smguo2001

Wow, thank you both! Didn't think I could get replies so quick.

Mike, what do you mean by "outside"? You mean the other side?

oh'mike

Wood is like a book made of paper---some times the 'pages' have gaps at the edges---no problem.

If the book(wood) is sliced on such a way that the openings are on the cover (face) then the strength of the book is weakened.

This explanation stinks----sorry----Bottom line,you're good. No worries about your house.---Mike----

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tcleve4911

.....but he's right.....