Can you have attach smaller wood joist with larger joist for the floor construction?

Question

I am working on architectural model. 2 x 18 j-joist can span up to 30 feet. There are other areas that need joist that span up to 20'-4". I don't think that I would need 2 x 18 j-joist for that area. It cost more money and I figure that it would be cheaper to go with 2 x 12. How is it possible to attach the smaller joist with the larger joist? Any helpful photos or diagrams would be helpful. Thank you in advance.

Update:

Colorado is the state. I hope that helps. Thanks.

KJR · Accepted Answer

Speak with a structural engineer, or talk with your local building inspector.

mr.obvious · Answer

Maybe you can split the difference, take 3' x8" off the top of the 18" and 3'x 4" off the bottom of the 12" and stack them together with construction adhesive and plates.

Grim · Answer

i might just use a nail plate/truss connector depending on where it is
http://ecx.images-amazon.com/images/I/511pa2CEuJL._SL500_AA300_.jpg
http://www.multinail.com.au/deploycontrol/images/upload/mc_nailplate_mn_image_l.jpg

i don't know what state you live in but you would most likely need to check your local and state building codes here: http://www.reedconstructiondata.com/building-codes/
it also depends on what the joists are being used for i.e. : floor joists, ceiling joists... 

if you don't find it in there than consult your local city hall

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Can you have attach smaller wood joist with larger joist for the floor construction?

3 Answers