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MisterSteve 09-28-2012 03:41 PM

Deck Beam Splicing
I know this is beating a dead horse so I'll ask short and simply. Should beam splices meet and be set over the support posts or staggered and offset?

Posts or pilings are 8 x 8, 10' o.c. and notched for beam to rest on.

Beam is 2 - 2 x 10's

joed 09-28-2012 04:37 PM

All joints over the support posts.

GBrackins 09-28-2012 04:40 PM

good question ...... in days of old we used spliced beams. they can be used today but would require evaluation by a professional engineer to ensure they are built correctly.

now with the new building code it has been interpreted based upon the span tables for beams only providing simple span that all beam splices should occur over the supports. now let's say you're using a three ply beam and the width of your deck is 20'. my understanding is you could have two 20' members (using your 10' span example) and a center member that is 10' in length. this way all splices are occurring over the supports. where there is a splice (two members abutting one another) they must occur over a support.

I do not believe it means that every ply must be spliced at each and every support. Your building official though is the one that has the final say, so ask them .....

hopefully Daniel Holzman will read your post and provide feedback as he is our resident professional engineer.

for some additional information in regards to decks I recommend checking out the American Wood Council's "Prescriptive Residential Wood Deck Construction Guide" which is based upon the 2009 International Residential Code, basis for most local and state building codes.

Rocket98 09-28-2012 05:09 PM

Split your beams on the post. You should use a st12 to hold the beams together.

MisterSteve 09-30-2012 06:28 AM


Originally Posted by Rocket98 (Post 1019451)
Split your beams on the post. You should use a st12 to hold the beams together.

What is st12?

AtlanticWBConst. 09-30-2012 08:29 AM


Originally Posted by MisterSteve (Post 1020339)
What is st12?

Simpson Strap Tie:

Daniel Holzman 09-30-2012 10:27 AM

According to International Residential Code (IRC) 2006 or 2009 Prescriptive Deck Code, which governs most (not all) decks in the U.S., all splices must occur over a post. See figures 3 and 4 for details. Beam construction is shown in the guide, and requires only nailing the individual sawn lumber pieces together following the nailing schedule shown on Figure 4. Figure 8 shows the required connection between a post and a beam. Nothing in the code requires use of a Simpson ST12 to hold the beam together, your local requirements may be different, check with your building inspector.

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