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What size boards?

Short answer - no - not really
There are 20' joist available at most lumber stores - even HD/Lowes
I went with I-joists on a 17' span for added strength - walk up attic
 

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2 fingered typer
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You'd better check your load and span tables

I need ceiling joists 20', but can only 16'. Can I
splice two boards to get the length?
20 feet is a hellofaspan if there is a floor load above. If this is a garage with "no load" above, remember how stuff gets stuck up above the rafters? heh..heh What's your application here? :confused1: bill
 

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Without the assistance of a structural engineer a splice in the span is a big no-no. You can get 20' lumber at nearly any good lumberyard.
 

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You have to be careful when using I-joist for ceiling joists because you can't just cut the top angle on the I-joist to follow the top of rafter beyond the inside of the wall. 2x's you can.

Scroll down to the bottom left on page 12.

http://www.kentinternational.ca/brochures/Timberframe_System/TJI.pdf
Ah, I had a walk up attic above that
So they were a ceiling joist & a floor joist
I think I'd be inclined to install a double top plate across the I-joists & then the rafters
Good point
 

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I need ceiling joists 20', but can only 16'. Can I splice two boards to get the length?
You need to specify the use for these. What loads they will carry? Partition walls under the joists?
The post is too vague to be answered.
Ron
 
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