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Deck Design Question

 
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Old 10-01-2018, 05:16 PM   #1
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Deck Design Question


Ok guys, so im building a deck. The foot print is 30'x11'. The client wants to remove 2 of 5 existing columns on the end of the balcony, increasing the span from post to post on the one side (30ft side) to 15ft, center to center. The rim (its a second story balcony) is currently 2-2x12 with with 4 center beams (2- 2x12) and 2x8 joisting between beams. Can the 2x8 joisting be run at 15 ft lengths, beam to beam, if I eliminate 2x posts, upsize the existing posts (6x6 to 8x8), use WRC 4x12 for the rims, and WRC 4x12 beams? Ill attach drawings if I can fifure it out.

No, im not an engineer, the little muni I'm building this in doesn't require an engineers signature, just drawings apporved by the chief inspector.

Gimme feedback guys. Thanks.
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Old 10-02-2018, 06:34 AM   #2
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Re: Deck Design Question


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Originally Posted by DavidBarret223 View Post
Ok guys, so im building a deck. The foot print is 30'x11'. The client wants to remove 2 of 5 existing columns on the end of the balcony, increasing the span from post to post on the one side (30ft side) to 15ft, center to center. The rim (its a second story balcony) is currently 2-2x12 with with 4 center beams (2- 2x12) and 2x8 joisting between beams. Can the 2x8 joisting be run at 15 ft lengths, beam to beam, if I eliminate 2x posts, upsize the existing posts (6x6 to 8x8), use WRC 4x12 for the rims, and WRC 4x12 beams? Ill attach drawings if I can fifure it out.

No, im not an engineer, the little muni I'm building this in doesn't require an engineers signature, just drawings apporved by the chief inspector.

Gimme feedback guys. Thanks.
All the weight that the 2 columns support, will be diverted onto remaining columns and you up the beams to 8x8 does the existing footing is wide enough designed to support that size column and the load?
Why not keep existing 6x6 posts and use 5 1/4 X 11 7/8" Prallam Plus to cover that span if your load is 40LL (if you have to meet 60LL even 14" might not work with a 15' span? Or better yet call someone who knows what they doing of get an engineer.

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Last edited by greg24k; 10-02-2018 at 06:42 AM.
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Old 10-02-2018, 07:53 AM   #3
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Re: Deck Design Question


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All the weight that the 2 columns support, will be diverted onto remaining columns and you up the beams to 8x8 does the existing footing is wide enough designed to support that size column and the load?
Why not keep existing 6x6 posts and use 5 1/4 X 11 7/8" Prallam Plus to cover that span if your load is 40LL (if you have to meet 60LL even 14" might not work with a 15' span? Or better yet call someone who knows what they doing of get an engineer.
Could also just use red iron I beam and wrap it.
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Old 10-02-2018, 07:58 AM   #4
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Re: Deck Design Question


Greg2k I do know that the red cedar 4 X 12 that I'm thinking of using to cover a 15 foot span from 8x8 to 8 x 8 is sufficient enough to handle the weight. The 30 foot span runs parallel to the house the 11 foot span runs perpendicular to the home. There are going to be three posts across both 30 foot spans, on either side. There will be 4 X 12 on the left and right edge, and a 4 x 12 down the middle, and two 4 X 12 across the front 30 foot span. In between the Forex twelves that run perpendicular to the home, I am anticipating using 2 by 8 on 16 Center. What I'm wondering is, most importantly, are the two by 8 sufficient size to run at 14ft 6in? Or should I upsize them to 2 by 10?
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Old 10-02-2018, 08:09 AM   #5
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Re: Deck Design Question


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Originally Posted by DavidBarret223 View Post
Greg2k I do know that the red cedar 4 X 12 that I'm thinking of using to cover a 15 foot span from 8x8 to 8 x 8 is sufficient enough to handle the weight. The 30 foot span runs parallel to the house the 11 foot span runs perpendicular to the home. There are going to be three posts across both 30 foot spans, on either side. There will be 4 X 12 on the left and right edge, and a 4 x 12 down the middle, and two 4 X 12 across the front 30 foot span. In between the Forex twelves that run perpendicular to the home, I am anticipating using 2 by 8 on 16 Center. What I'm wondering is, most importantly, are the two by 8 sufficient size to run at 14ft 6in? Or should I upsize them to 2 by 10?
You want 2x8s at a 14 foot span? Googling a simple span chart will show you that that's a big no.

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Old 10-02-2018, 08:11 AM   #6
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Re: Deck Design Question


Heavy, I just looked that up, thanks. I appreciate your Reply.
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Old 10-02-2018, 02:28 PM   #7
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Re: Deck Design Question


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Heavy, I just looked that up, thanks. I appreciate your Reply.
Have you done the load calculations to make sure the existing footings will support the deck? (since you are removing some)

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Old 10-02-2018, 04:12 PM   #8
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Re: Deck Design Question


Not sure what the minimum requirements to be a GC is in your state, but these are basic questions a GC should know around here.

At least know where to get the load calcs.


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Old 10-02-2018, 05:16 PM   #9
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Re: Deck Design Question


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Not sure what the minimum requirements to be a GC is in your state, but these are basic questions a GC should know around here.

At least know where to get the load calcs.


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There are no min standards in my state and I know how to calc loads and find span charts.
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Old 10-02-2018, 06:21 PM   #10
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Re: Deck Design Question


There is no license required to be a GC in the state of Texas.

They require a license for electrical and (I think) plumbing contractors.

Andy.
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Old 10-04-2018, 05:47 PM   #11
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Re: Deck Design Question


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Originally Posted by Californiadecks View Post
Not sure what the minimum requirements to be a GC is in your state, but these are basic questions a GC should know around here.

At least know where to get the load calcs.


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Mike, I did the load calcs and submitted for review for the building inspector. Along with my drawings and ratings for the materials speced to be use, they were approved. Like i said, I'm not an engineer, but I can figure stuff out and I know where to ask if I have trouble with something. The span charts helped out in solving my joist with question, and the load bearing question about the footings was reviewed previously by an engineer who had written up an estimate for the removal of two posts a while back. Bit he didnt have the issue of the joist spacing and length in his paperwork. Just the removal of the 2 posts.
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Old 10-04-2018, 10:48 PM   #12
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Re: Deck Design Question


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Mike, I did the load calcs and submitted for review for the building inspector. Along with my drawings and ratings for the materials speced to be use, they were approved. Like i said, I'm not an engineer, but I can figure stuff out and I know where to ask if I have trouble with something. The span charts helped out in solving my joist with question, and the load bearing question about the footings was reviewed previously by an engineer who had written up an estimate for the removal of two posts a while back. Bit he didnt have the issue of the joist spacing and length in his paperwork. Just the removal of the 2 posts.
Holy crap, 4 posts and he's calling you Mike.

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Old 10-07-2018, 12:24 PM   #13
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Re: Deck Design Question


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There is no license required to be a GC in the state of Texas.

They require a license for electrical and (I think) plumbing contractors.

Andy.
Mechanical also.

Out in the boonies where I live there are literally no inpsections. I did have to get a permit for the septic system but, it was never inspected.
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Old 10-07-2018, 02:24 PM   #14
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Re: Deck Design Question


Beams are the easy part

The footprint of the remaining footings have to become bigger.

How does one do that below grade with not way to epoxy rebar into the existing?
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Old 10-08-2018, 03:23 PM   #15
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Re: Deck Design Question


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Beams are the easy part

The footprint of the remaining footings have to become bigger.

How does one do that below grade with not way to epoxy rebar into the existing?
Prop it up and make new footings.
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Old 10-13-2018, 03:13 PM   #16
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Re: Deck Design Question


I have a deck design question.


Any better solution to the two side by side deck posts at the top of a landing? A returned upper rail to the adjacent post would look better but the finish material is composite. Maybe Radiance Rail
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Old 10-13-2018, 03:16 PM   #17
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Re: Deck Design Question





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Old 10-13-2018, 03:25 PM   #18
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Re: Deck Design Question


Hmmm so you added another soldier for aesthetics.
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Old 10-13-2018, 05:50 PM   #19
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Re: Deck Design Question


Both sides I thought it looked better. I could've designed it differently.


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Old 10-13-2018, 06:23 PM   #20
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Re: Deck Design Question


Gotta plan at least a 5ft step then.

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