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walkereng
walkereng, Consultant
Category: Structural Engineering
Satisfied Customers: 2592
Experience:  Over 30 years of Structural Engineering experience.
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How to splice (2) 2" x 10" together to make 1- 24' rafter

Customer Question

how to splice (2) 2" x 10" together to make 1- 24' long rafter
Submitted: 2 months ago.
Category: Structural Engineering
Expert:  walkereng replied 2 months ago.

I can help

Expert:  walkereng replied 2 months ago.

1. So you want to splice two 2x10's to make 24' long roof rafters?

2. What species and grade of 2x10's do you have?

3. What city and state do you live in?

Customer: replied 2 months ago.
wood type is douglas fir
Cathedral City, Calif.
Expert:  walkereng replied 2 months ago.

One more question, what type of roof covering do you have?

Expert:  walkereng replied 2 months ago.

Also what rafter spacing will you have?

Customer: replied 2 months ago.
Flat roof, one story building
24" rafter spacing
Customer: replied 2 months ago.
flat roof, one story
24" rafter spacing
Expert:  StructuralEng replied 2 months ago.
Hello
Expert:  StructuralEng replied 2 months ago.
I can help
Customer: replied 2 months ago.
It looks like you want me to call you because that is the only option you are giving me. I don't have a problem with that but don't want to spend $34. more dollars.Please let me know.
Thank you,
Bill
Expert:  StructuralEng replied 2 months ago.
No, you don't need to call.
Expert:  StructuralEng replied 2 months ago.
How long can you make each 2x10?
Customer: replied 2 months ago.
I still don't see how I can get the answer.
Please help me with what I am missing.
Expert:  StructuralEng replied 2 months ago.
Are you able to see my questions?
Expert:  walkereng replied 2 months ago.

A 2x10 can not span 24' with a 24" o.c. spacing, so you would not be able to splice two 2x10's together.

Have you thought of using Engineered Lumber members? I can size them for you.

Expert:  StructuralEng replied 2 months ago.
Sorry
Customer: replied 2 months ago.
I mentioned they were 2x12. Not 2x10
Expert:  walkereng replied 2 months ago.

It said 2x10's in your question, sorry.

what type of roof covering do you have

Customer: replied 2 months ago.
Flat roof, foam covering and only One story
Customer: replied 2 months ago.
Do you have another question?
Expert:  walkereng replied 2 months ago.

I’d like to point out that a Professional Engineer’s standard of care typically includes a site visit to assess field conditions and get an overall understanding of the structure. This can obviously not be accomplished through the internet. The information provided here is meant for planning purposes only (general sizing and budgeting) and is based on the information provided by you. All loading cases considered are for vertical loads only, no lateral analysis has been completed. The information should be verified by a professional engineer who can visit the site to ensure that potentially important information has not been overlooked or omitted.

Hold on, let me run a few numbers for you.

Expert:  walkereng replied 2 months ago.

For a flat roof, and rafters spanning a 24' clear span and spaced at 24" o.c., you would need double 2x12's Douglas Fir (#2 grade or better). So even if you could splice your 2x12's, single 2x12's at 24" o.c. will not work.

Have you thought of using Engineered Lumber members? I can size them for you.

Customer: replied 2 months ago.
Ok thank you. What would be a proper bolt size, pattern and length of splice contact ?
Expert:  walkereng replied 2 months ago.

Sorry for the delay, I am traveling today and am on a layover at the airport right now.

I had said above that solid 2x12's will not span 24', spaced at 24" o.co under your loading. Splicing members are weaker than full length members, so you can not do it with your configuration.

If you want to space your 2x12's closer together, you may be able to do it. Like 2x12's at 12" o.c.

If you were to space them at 12" o.c., what would be the longest 2x12' you could purchase?

Expert:  walkereng replied 2 months ago.

If you feel you have received a satisfactory answer to your question, click the Rating button that is appropriate. Experts are credited for each adequately Rated answer they provide. If you have additional questions, please let me know. Thanks

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