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Old 04-21-2017, 04:55 PM   #1
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is blocking considered structural? Decks


Hi,

Is blocking on decks considered structural?

If my joists are 2x12 am I required by code to use the same dimension lumber for the blocking or can I go down to 2x4 , 2x6 ....


I found a stock pic of what I am considering, I am not a great artist..lol

but can the deck boards run the way i drew and can I use smaller lumber then the joists? As far as if code allows it....
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Old 04-21-2017, 04:59 PM   #2
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Re: is blocking considered structural? Decks


I thought the pic was added but guess not...

https://postimg.org/image/ac945dzh1/

here is the link[IMG]https://postimg.org/image/ac945dzh1/[/IMG]
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Old 04-21-2017, 06:00 PM   #3
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Re: is blocking considered structural? Decks


Check with your local building office.

It could be a local or seismic requirement, which can over-rule a national model code that may have been adopted by a state or city.

Are you in a seismic area?

Dick
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Old 04-21-2017, 06:57 PM   #4
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Re: is blocking considered structural? Decks


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Originally Posted by m209 View Post
Hi,

Is blocking on decks considered structural?

If my joists are 2x12 am I required by code to use the same dimension lumber for the blocking or can I go down to 2x4 , 2x6 ....


I found a stock pic of what I am considering, I am not a great artist..lol

but can the deck boards run the way i drew and can I use smaller lumber then the joists? As far as if code allows it....
Quote:
Originally Posted by concretemasonry View Post
Check with your local building office.

It could be a local or seismic requirement, which can over-rule a national model code that may have been adopted by a state or city.

Are you in a seismic area?

Dick

Thanks. No im not in a seismic area. I live in PA.

My building code doesn't over ride any national model code. On all the building plans it states that they have adopted the IRC as code.


I just cant find it in the IRC about my specific question.

Do you know if the IRC allows what I am proposing?
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Old 04-21-2017, 07:01 PM   #5
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Re: is blocking considered structural? Decks


Don't know the answer.....but part of what blocking does is to keep the joists from twisting.....and a two bye four isn't going to do a lot for a two bye twelve. Ron
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Old 04-21-2017, 07:47 PM   #6
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Re: is blocking considered structural? Decks


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Originally Posted by ront02769 View Post
Don't know the answer.....but part of what blocking does is to keep the joists from twisting.....and a two bye four isn't going to do a lot for a two bye twelve. Ron

Good point didnt think of that
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Old 04-21-2017, 07:48 PM   #7
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Re: is blocking considered structural? Decks


If the blocking is carrying the decking material, ie: the decking is running the same direction as the joists, then yes, in this instance it is structural in that it is carrying the load placed on the decking.
I would consider using hangers for those blocks. Nails would not be strong enough to trust in this case, IMHO
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Old 04-22-2017, 06:16 AM   #8
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Re: is blocking considered structural? Decks


Quote:
Originally Posted by m209 View Post
I thought the pic was added but guess not...

https://postimg.org/image/ac945dzh1/

here is the link[IMG]https://postimg.org/image/ac945dzh1/[/IMG]

You only have a 14-1/2" span. I'd up the blocking to 2x6, offset 1-1/2" from each other and use 3 galvanized ring shank gun nails on each end.
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