Framing Plan For Large Deck In New England - Decks & Fencing - Contractor Talk

Framing Plan For Large Deck In New England

 
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Old 06-02-2016, 09:51 AM   #1
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Framing Plan For Large Deck In New England


Hi Guys,

First major question for the forum. I have a deck of the back of the house that was framed originally with a ledger but the deck was never constructed. I pulled the 12 year old ledger off and confirmed it was flashed properly and the integrity of the sheathing is good behind the ledger thus easing my concern that the rim joist is also in good shape to be fastened to and support the decks loads. I have 4 foot deep concrete footings for the posts but the deck plan is very large and the footings sit at 16 feet from the house and at 7 foot 6 inches on center from each other. My primary question is whether or not this span is too great a load to place on the ledger board? The deck will be framed with 2x10 PT southern pine out to a 3 board 2x10 beam notched into the 6x6 posts. Is a new 2x10 ledger fastened to the house using LedgerLoks going to be a sound framing design for this deck?
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Old 06-02-2016, 12:02 PM   #2
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Re: Framing Plan For Large Deck In New England


Pretty sure 2x10s can't span 16' as joists. (Unless 8" o.c.)

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Old 06-02-2016, 12:50 PM   #3
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Re: Framing Plan For Large Deck In New England


The tables I've seen rate them up to 16' 10" depending on spacing...these ones rate that at 12" OC. So maybe I have to reduce spacing to 12"

http://constructitall.com/9-uncatego...a-rafters.html

http://parkeronline.org/DocumentCenter/Home/View/732
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Old 06-02-2016, 01:03 PM   #4
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Re: Framing Plan For Large Deck In New England


Span chart is probably right. Technically it will span that however you'll get a pretty decent bounce in the center. My rule of thumb is anything over 14' get two beams. I'm building a deck not a trampoline.
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Old 06-02-2016, 01:14 PM   #5
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Re: Framing Plan For Large Deck In New England


Ok so I'll run a second set of posts and another beam to split the span...I agree I'm not interested in a bouncy final product
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Old 06-02-2016, 01:26 PM   #6
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Re: Framing Plan For Large Deck In New England


Where you are located will determine what snow loading and other loading you will need to meet code for your area. You did not provide that information yet.

Notching a 6x6 for three 2xs will only leave 1" of the 6x6 which I think would not be enough. Perhaps think about a Simpson connector for that.

Also as an aside, I am pretty sure you will need that ledger to be 2 x 12 not 2 x 10.

How high is the deck? How much above grade?

Andy.
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Old 06-02-2016, 01:31 PM   #7
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Re: Framing Plan For Large Deck In New England


Deck is in Connecticut. Deck is off first floor but over a walk out basement so roughly one story above grade
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Old 06-02-2016, 01:59 PM   #8
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Re: Framing Plan For Large Deck In New England


If these are all SYP, you MUST use current SYP span tables. Keep in mind, this is a wet application.
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Old 06-02-2016, 03:14 PM   #9
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Re: Framing Plan For Large Deck In New England


No2 SYP span here spaced 12" OC appears to be 16' 2"

http://www.southernpine.com/app/uplo...le2_060113.pdf
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Old 06-02-2016, 06:01 PM   #10
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Re: Framing Plan For Large Deck In New England


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Originally Posted by Woodstock View Post
No2 SYP span here spaced 12" OC appears to be 16' 2"

http://www.southernpine.com/app/uplo...le2_060113.pdf
Unless it gets wet. This is outside, unless you put a membrane over it, it's going to get wet, that makes it wet service: http://www.southernpine.com/app/uplo...e12_060113.pdf
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Old 06-02-2016, 06:05 PM   #11
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Re: Framing Plan For Large Deck In New England


Identical span for my design in table 12...but thank you for pointing me to the appropriate table...did not notice table 2 was not for wet

Last edited by Woodstock; 06-02-2016 at 06:08 PM.
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Old 06-02-2016, 06:27 PM   #12
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Re: Framing Plan For Large Deck In New England


Do you know who originally built it for a deck to be added?

To me, that ledger is the biggy in this project.
16' is a healthy span.
What size are the floor joists?
Is there double top cap on 1st floor wall framing?
...You know what you're building. I worry about the unknowns...
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Old 06-02-2016, 07:40 PM   #13
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Re: Framing Plan For Large Deck In New England


Last year I rebuilt a deck that was the same size and built almost identical. It collapsed from snow load. It pulled off the house and then the post folded and the beam ended up on the ground . Nothing was rotted or overly hacked it just wasn't stout enough for the weight.
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Old 06-02-2016, 07:51 PM   #14
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Re: Framing Plan For Large Deck In New England


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Originally Posted by Woodstock View Post
I have 4 foot deep concrete footings for the posts but the deck plan is very large and the footings sit at 16 feet from the house and at 7 foot 6 inches on center from each other
Do his again at 8' out and you can use 2x8 joists.
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Old 06-02-2016, 07:52 PM   #15
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Re: Framing Plan For Large Deck In New England


Depending on what needs to be below the deck, I'd prefer to use 2 beams with 2-2x10.

If you really need to minimize the amount of framing below the deck then you could shift your beam back to 13-14' from the ledger and cantilever the joists. I'd definitely use 12" spacing if you're going that route and at least 1 course of blocking to help with bounce. Two would be better.
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Old 06-02-2016, 08:04 PM   #16
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Re: Framing Plan For Large Deck In New England


I think that's the path I'm going to take...2 beams one at 8' from the house and one at 16' both (2) 2x10.
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Old 06-03-2016, 09:19 AM   #17
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Re: Framing Plan For Large Deck In New England


shy away from 40live load. code is bare bones min and cheap. use the chart as guide for minimum standards only.

ledger to beam 2x10 10ft span. Then another will keep you solid. keep the footing up to 6ft. if over 2ft throw some angle bracing 4x4's or 2x6's. lock that chit up all around. the last 2-deck I winded up using all carriage bolts forgot what it was like but I gotta tell I think there better and less fuss over fastenmaster thru bolts.
make sure those footings look like inverted mushroom or preferred is to just have the sonic tube above the grade the rest is bigger. or to hell with all that digging and get heli pier guy. they be 1 and done by lunch. I used Dan Watson...great job btw will gladly use again. I just used on my 1st 1000sf ground deck. .... 1/word dreamie. Side note I had myd on my boot for the 1st time.

the thing that most builders fail to realize is that "build it they will come' Really happens on new decks. they will pack that chit with every body they know. It will be the most used area in the house because deck are extensions of there lifestyle and house any more.
for another what 100 bucks frame out at 12oc and you'll never look back.
I average 65-75 ll on my gigs. My customers send me notes and picts all the time. I have 30people coming over for my b-day party is it ok.... keep in mind this 30people packed on 250-300sf roof top.

post the picts.
Attached Files
File Type: pdf Deck_Joist_Beam_Span_chart.pdf (42.0 KB, 120 views)
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Old 06-06-2016, 10:44 AM   #18
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Re: Framing Plan For Large Deck In New England


So is there any reason to stay with 2x10 for the beams if I now reduce the span to 8 feet for the joists by adding a second beam? Drawback to (3) 2x8s for the beams?
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Old 06-06-2016, 06:22 PM   #19
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Re: Framing Plan For Large Deck In New England


When you go 3x, the mounts, in my experience, are mucho more $.
Maybe follow current span tables and bump up when is makes sense.
Feel good and comfortable with what you are building - big key.
Anything that up high that can have real sway forces, I take very serious.
Wanna be able to sleep well at night.
Safety may be a big factor to your customer, or not.
If it is, you can lead them along the path to eternal happiness and build as needed...and justify it.

We recently did a deck to hold a 8x14 hot tub/wave-action swimming pool thingy in the center.
3x12s on many 6x6 with 4x6 close joists 1-2.5' above ground..tons on crete....went 2' beyond on each side of pool placement with hulk framing. Even did sway bracing that low.


The ones up high you brace to limit potential dynamic sway force.
If you're adding posts just off the house, you should be clear.
You can break down the load to house, inner posts and outer posts and decide on placement.
I'd lean towards freestanding type build with added benefit of being locked to the home - kills so much sway force.
Kinda like....if the house blows away the deck will still be there....

...edit: you can find many pics on the Net of decks still standing with the homes blown away during hurricanes.
Kinda sinks in....

Last edited by TG Deck; 06-06-2016 at 06:26 PM.
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Old 06-06-2016, 07:15 PM   #20
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Re: Framing Plan For Large Deck In New England


Quote:
Originally Posted by Woodstock View Post
Deck is in Connecticut. Deck is off first floor but over a walk out basement so roughly one story above grade
You do realize....there is a Woodstock Connecticut..

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