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Cantileavered Deck Construction - Anyone With Experience?

 
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Old 11-20-2019, 07:01 PM   #1
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Cantileavered Deck Construction - Anyone With Experience?


We are rehabbing an old barn for a customer, the bones of the barn are good but the siding and the roof were trashed. The roof is done and we are working on the metal siding now and on one end of the barn we have to put in some doors and windows and a deck that extends off the hayloft . Below the deck is going to be a roll up door and the customer wants to be able to drive stuff in and out of the door under the deck so he dosen't want any posts under the deck.

the deck isn't going to be very big probably come out from the barn 6 foot and be 10 foot wide with French doors leading from the hayloft to the deck.

I have the LVL manufacturers engineers doing a structural drawing for me as to their recommendations for the number and sizes of LVL's to use. I have nice 8x8 posts every 14 foot supporting the hayloft that I can attach the LVL's to, so I think it is going to end up with 4 12" to 16" LVL's that will be 20 foot long and have 14 foot inside the barn attached to the hayloft support posts and then the remaining 6 foot extending outside the barn to support the deck. May have some additional LVL's in the middle if the engineers say its necessary.

I didn't know if anyone had any experience building a cantileavered deck before and could share some wisdom.

Thanks,

Michael
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Old 11-20-2019, 07:07 PM   #2
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Re: Cantileavered Deck Construction - Anyone With Experience?


What wisdom exactly?

You have an engineer on it.
I think thatís a very wise approach.

Basically....his calcs will dictate the plan.

(Iím more concerned about putting metal ag panels on an old barn as siding.
Offends my sensibilities...)


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Old 11-20-2019, 07:32 PM   #3
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Re: Cantileavered Deck Construction - Anyone With Experience?


We all know that engineers while very good arent perfect so I still like to ask the question of those with more experience just to make sure I have enough info to ask intelligent questions .....

I agree wood siding would have been better but the cost was much higher and he is doing the metal tastefully, it acctually does look pretty good, the parts that are done that is.





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Originally Posted by BlueRidgeGreen View Post
What wisdom exactly?

You have an engineer on it.
I think thatís a very wise approach.

Basically....his calcs will dictate the plan.

(Iím more concerned about putting metal ag panels on an old barn as siding.
Offends my sensibilities...)


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Old 11-20-2019, 11:58 PM   #4
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Re: Cantileavered Deck Construction - Anyone With Experience?


I think you'll be surprised at how much depth you wind up with between the header and the LVLs.

You need an engineered header.
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Old 11-21-2019, 12:08 AM   #5
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Re: Cantileavered Deck Construction - Anyone With Experience?


I'd have no problem cantilevering a deck 6' with a 16" LVL. Providing the LVL's go back far enough and are supported properly.


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Old 11-21-2019, 01:40 AM   #6
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Re: Cantileavered Deck Construction - Anyone With Experience?


It seems like a pretty simple engineering task.
Trust the engineers on this one, it would be kinda hard to go wrong for a guy that knows how to design for the gravity and wind loads.
There is quite a bit of open space for the openings but nothing insurmountable.

Andy.
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Old 11-21-2019, 08:53 AM   #7
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Re: Cantileavered Deck Construction - Anyone With Experience?


Thats what I am kinda thinking, pending engineering signoff and the particulars of like you said making sure that they are supported correctly.

I think where this is going to end up is using 4 - 16" by 20 foot long LVLs, for the supports and then we will build the deck on top of those.

Thanks,

Michael


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I'd have no problem cantilevering a deck 6' with a 16" LVL. Providing the LVL's go back far enough and are supported properly.


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Old 11-21-2019, 08:58 AM   #8
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Re: Cantileavered Deck Construction - Anyone With Experience?


Yes it does seem like a pretty simple design but ..... since Im not and engineer what do I know Im just a carpenter .....



Quote:
Originally Posted by ScipioAfricanus View Post
It seems like a pretty simple engineering task.
Trust the engineers on this one, it would be kinda hard to go wrong for a guy that knows how to design for the gravity and wind loads.
There is quite a bit of open space for the openings but nothing insurmountable.

Andy.
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Old 11-21-2019, 09:48 AM   #9
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Re: Cantileavered Deck Construction - Anyone With Experience?


Quote:
Originally Posted by ScipioAfricanus View Post
It seems like a pretty simple engineering task.
Trust the engineers on this one, it would be kinda hard to go wrong for a guy that knows how to design for the gravity and wind loads.
There is quite a bit of open space for the openings but nothing insurmountable.

Andy.
Good point regarding openings. Additional diagonal bracing may be required to prevent that wall from racking.

I think sheathing the inside portion of the deck platform would help with racking and give some great storage space.
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Old 11-21-2019, 09:58 AM   #10
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Re: Cantileavered Deck Construction - Anyone With Experience?


Quote:
Originally Posted by hdavis View Post
I think you'll be surprised at how much depth you wind up with between the header and the LVLs.

You need an engineered header.
Don't let the OP be surprised. Them them how much.
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Old 11-21-2019, 10:10 AM   #11
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Re: Cantileavered Deck Construction - Anyone With Experience?


Quote:
Originally Posted by SmallTownGuy View Post
Don't let the OP be surprised. Them them how much.
Didn't want to say without sizing the header with no dimensions, but guessing it would be at least 2 feet.
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Old 11-21-2019, 10:20 AM   #12
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Re: Cantileavered Deck Construction - Anyone With Experience?


Quote:
Originally Posted by SmallTownGuy View Post
Don't let the OP be surprised. Them them how much.
Didn't want to say without sizing the header( with no dimensions), but guessing it would be at least 2 feet.
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Old 11-21-2019, 10:29 AM   #13
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Re: Cantileavered Deck Construction - Anyone With Experience?


I have been thinking about but I think we are lucky in this case and I will take some pictures to show what I am talking about. The hayloft is built as it's own substructure within the barn. it is not tied into the framing and support structure of the barn itself.

The hayloft is a 10x10 platform that they built down the middle of the barn with 8x8 timber post sunk into the ground every 14 ft. then they put a triple 2x8 header across at every post, they framed up the joists on the triple headers for the length of the barn.

Even at the ends of the barn, the barn is framed up to exist without the hayloft. So yes I am looking at some different possibilities to give some lateral racking strength to the 10x10 hayloft structure.

One possibility I am looking at is running 2x10's across the bottom of the hayloft floor joists every 6 to 8 foot or less if necessary and then the LVL's will be mounted underneath the hayloft floor structure so that and upward pressure from the LVL's is transmitted into the entire length of the hayloft.

I'll take some pictures today when I go out there and post them to show what the structure looks like.

Michael


Quote:
Originally Posted by TheConstruct View Post
Good point regarding openings. Additional diagonal bracing may be required to prevent that wall from racking.

I think sheathing the inside portion of the deck platform would help with racking and give some great storage space.
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Old 11-21-2019, 11:59 AM   #14
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Re: Cantileavered Deck Construction - Anyone With Experience?


So the header won't necessarily have to take any of the deck or loft load?
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Old 11-22-2019, 11:55 AM   #15
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Re: Cantileavered Deck Construction - Anyone With Experience?


Quote:
Originally Posted by hdavis View Post
So the header won't necessarily have to take any of the deck or loft load?
That is correct, if the engineer signs of on what I have designed in my head then the LVL's will support the entire load and the header will only be used to keep it snug against the barn.

Michael
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Old 11-22-2019, 08:31 PM   #16
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Re: Cantileavered Deck Construction - Anyone With Experience?


LVL's sitting on posts in the wall?


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