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Old 09-25-2012, 08:45 PM   #16
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Attaching Porch Column to a flush beam


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So how close do you have to be on the vertical alignment between the deck post on the frost footing and the porch post on the beam above? Do I have to dig a new adjacent footing if a porch post is not directly over the deck post? (My corner posts are right on but I need to fudge the two middle ones to get them evenly spaced. This came about because the porch roof was an afterthought --no cantilever of the deck at the corner. Its 9x21 ft with house ledger on two sides. Thanks.
Rule of thumb: the offset can be up to the depth of the beam. If you're using 2x8 beams, you can be off by 7-1/4".

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Old 05-18-2013, 03:08 PM   #17
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Attaching Porch Column to a flush beam


This thread may be old, but it helped me a ton. This is awesome.
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Old 05-18-2013, 05:21 PM   #18
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Attaching Porch Column to a flush beam


Great Video. Your deck appears to be designed to hold an Abrams tank or two.

As far as the posts go, I would notch your posts so that 2/3rds sit on the girder, and one third continues down to the bottom of the girder, and gets lagged or through bolted to the girder. The bolts should have large flat washers under the head (And Nuts) which cut into the wood. Fastening the posts like this gives you the best of both worlds, good compressive strength, and good resistance to Moment (wind loads)

Your deck looks extremely well built. thanks for the video.
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Old 05-18-2013, 05:56 PM   #19
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Attaching Porch Column to a flush beam


J,

any other way to do it? even Abrams need out of the weather sometimes .....

gotta run get a powerball ticket, if you don't see me on here you'll know why!
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Old 05-18-2013, 06:37 PM   #20
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Attaching Porch Column to a flush beam


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J,

any other way to do it? even Abrams need out of the weather sometimes .....

gotta run get a powerball ticket, if you don't see me on here you'll know why!
Dont bother, I just bought 20 bucks worth, and Im gonna win. If I do, I might take a day off from posting!
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Old 05-18-2013, 06:43 PM   #21
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Attaching Porch Column to a flush beam


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So how close do you have to be on the vertical alignment between the deck post on the frost footing and the porch post on the beam above? Do I have to dig a new adjacent footing if a porch post is not directly over the deck post? (My corner posts are right on but I need to fudge the two middle ones to get them evenly spaced. This came about because the porch roof was an afterthought --no cantilever of the deck at the corner. Its 9x21 ft with house ledger on two sides. Thanks.
Irrelevant if I understand the question. The deck substructure transfers the vertical loads to the footings. Where the posts are located on the perimeter of the deck is irrelevant.
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Old 05-18-2013, 07:53 PM   #22
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Attaching Porch Column to a flush beam


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Irrelevant if I understand the question. The deck substructure transfers the vertical loads to the footings. Where the posts are located on the perimeter of the deck is irrelevant.
Yes... Assumng your flush beam is adequetly sized for your post/pier spacing (and of course the expected imposed loads)


My question is how are you going to attach the posts to your flush beam.... considering shear issues.
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Old 05-19-2013, 12:13 AM   #23
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Attaching Porch Column to a flush beam


I myself would probably use a Simpson Strong-Tie ABU standoff post base with (2) lag screws
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Old 05-19-2013, 07:48 AM   #24
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Attaching Porch Column to a flush beam


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I myself would probably use a Simpson Strong-Tie ABU standoff post base with (2) lag screws
Most examples of those show them connected to a concrete post. Is there a reason they couldn't be used in a wood-to-wood connection.
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Old 05-19-2013, 10:18 AM   #25
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Attaching Porch Column to a flush beam


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Irrelevant if I understand the question. The deck substructure transfers the vertical loads to the footings. Where the posts are located on the perimeter of the deck is irrelevant.
Just to clarify, I was asking about the allowable offset placement of load bearing porch roof posts. Snow loads on roofs can get pretty heavy in Minnesota, and I dont think you can just position the posts anywhere over your substructure beam and footings - much less along a cantilevered deck perimeter for example. But maybe I'm wrong?

This really is a great post thread - pun intended - I've learned a lot. My next question will be about tying a porch roof into the the existing roof lines and pitches.... (probably should start a new thread for that?)
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Old 05-19-2013, 10:18 AM   #26
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Attaching Porch Column to a flush beam


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Yes... Assumng your flush beam is adequetly sized for your post/pier spacing (and of course the expected imposed loads)


My question is how are you going to attach the posts to your flush beam.... considering shear issues.
What about something like this? My gut says "no" simply because there's no connection between the column and anything, just gravity and the steel.

http://i.imgur.com/neaI6Te.jpg

edit: removing the image hot link. Far too big to embed.
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Old 05-19-2013, 10:21 AM   #27
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Attaching Porch Column to a flush beam


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Just to clarify, I was asking about the allowable offset placement of load bearing porch roof posts. Snow loads on roofs can get pretty heavy in Minnesota, and I dont think you can just position the posts anywhere over your substructure beam and footings - much less along a cantilevered deck perimeter for example. But maybe I'm wrong?

This really is a great post thread - pun intended - I've learned a lot. My next question will be about tying a porch roof into the the existing roof lines and pitches.... (probably should start a new thread for that?)
As a rule of thumb, roof support over cantilever is a big no-no unless. Now if you had a professional engineer involved to verify the design, you can do some crazy stuff. Google "largest cantilever in the world" and you'll see what i mean.
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Old 05-19-2013, 11:41 AM   #28
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Attaching Porch Column to a flush beam


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Most examples of those show them connected to a concrete post. Is there a reason they couldn't be used in a wood-to-wood connection.
there is no reason I know that they cannot be used with wood. Change over from anchor bolt to either through bolts or lag screws.
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Old 05-19-2013, 01:01 PM   #29
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Attaching Porch Column to a flush beam


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there is no reason I know that they cannot be used with wood. Change over from anchor bolt to either through bolts or lag screws.
Out of curiosity, what would the proper notching method be? I know that structural integrity is compromised if you notch more than 1/3 a piece of wood, but it seems like a column would need more surface area resting on a beam to transfer the load. Of course I think between the notch resting on the beam and bolts through the beam, it would hold.

Something like this?

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Old 05-19-2013, 04:30 PM   #30
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Attaching Porch Column to a flush beam


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What about something like this? My gut says "no" simply because there's no connection between the column and anything, just gravity and the steel.

http://i.imgur.com/neaI6Te.jpg

edit: removing the image hot link. Far too big to embed.
Interesting.... I'm not an engineer and don't know.... certainly better than toe-nailing it though


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