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-   -   Deck Design - Does this work? (http://www.diychatroom.com/f19/deck-design-does-work-56858/)

stubits 11-09-2009 06:54 AM

Deck Design - Does this work?
 
2 Attachment(s)
Ok, so I just got the attached plans back from my architect. She's never designed a deck before and is doing this for us as a favor, more than anything else.

So, does this work? Any major concerns or flaws?

Specifically, what do you think of how the pergola structure attaches to the deck? What sort of connector would you use? Would something like this work? http://www.strongtie.com/products/connectors/BC.asp

Where she calls for a 6x10, can I simply combine 4 2x10? Do they make a joist hanger large enough to support a 6x10?

My biggest concern is with the footers. The frost depth here is 30", so I know I need to go at least that deep, but what diameter should sonotube should I use?

Thanks guys!

Scuba_Dave 11-09-2009 08:16 AM

6x10 has to be a 6x10 not (3) 2x's
I usually use 12" sono tubes
I tried zooming the pic but I still can't read all the small notations
Looks like a nice deck, but 8' 6" by ~12' isn't that big
My back deck wraps around my sunroom & is only 8' out from the house
It's not a lot of room, but we have an inground pool so normally down there

stubits 11-09-2009 08:25 AM

Thanks so much. You're right, it's tiny. We live in a rowhouse in DC, so our property is just a little more than 15' wide and if we went out much further we'd lose our whole backyard... the joys of city living. We're hoping this gives us a nice place to eat dinner and grill, but it's not meant as real entertaining space.

Are 6x10s hard to come by? Of course I've never seen them in the big box. Are they absurdly/prohibitively expensive? Do they make joist hangers for something like that? How would I attach it to the ledger board? Thoughts?

Have you ever seen this document, the Prescriptive Residential Wood Deck Construction Guide, http://www.awc.org/Publications/DCA/DCA6/DCA6.pdf, on page 9 it talks about footing diameters and seems like the smallest is a 15". Is that overkill for a deck this size?

Scuba_Dave 11-09-2009 08:34 AM

I've only seen 6x6's at the big box stores
I'm not sure why they spec'd 6x10's, is that the beam that the joist sit on?
If so then the beam can be made up of (3) 2x10's
The posts are usually 6x6's - so my error if that is the case

My deck was about 3' off the ground & I had ledge under the posts
So not moving anywhere
The footer is what the cement sono-tube will sit on as I understand it
Just as the footer for a foundation wall is much wider then the actual wall

tpolk 11-09-2009 08:40 AM

I'm sorry not being able to see your drawings clearer I still cannot fathom the use of 6x10 in those spans. maybe you could talk to one of the lumber company's sales reps as they will have strengths of lumber and span charts for material they carry. sounds like overkill to me and I have been building since 1970

stubits 11-09-2009 08:42 AM

The purpose of the 6x10 beam is to support the pergola structure above. The beams run parallel to the joists but are where the pergola attaches.

Still seem like overkill?

tpolk 11-09-2009 08:49 AM

yes not much load there

stubits 11-09-2009 08:49 AM

What would you suggest here?

tpolk 11-09-2009 08:53 AM

I would be more concerned with wind shear on pergola

stubits 11-09-2009 08:54 AM

So, how would you reconfigure this then? I assume I can reduce the size of the beam? What can I do about wind shear?

tpolk 11-09-2009 08:55 AM

if I understand the joist plan the I would think a triple joist would be more than adequate

stubits 11-09-2009 08:56 AM

makes sense... and for the wind shear concern?

tpolk 11-09-2009 09:00 AM

Simpson Strongties who make structural hangers and brackets has a multitude of choices for attatching posts to different members your architect may be able to help with this, your lumber sales should have books on simpson materials


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