Hi All,
Things going slow but sure on my project. Wondered if the porch posts holding up porch roof have to be above the concrete piers. The deck extends out a little, the piers won’t be seen when finished, and it would be better looking if the posts where spaced evenly with some not directly over piers. 4×4 posts sitting on doubled up 2×8 which sits on 2×8 to 4×4 to 2×8 beam. Simpson connectors all around.
And before you ask, the piers are where they are because the exiting footings were there. Old porch had a doubled 2×8 band beam sitting on concrete block on footings, porch actually sat 8 inches off grade, no way to see piers and posts nailed to decking, not necessarily over block piers.
Kevin
Replies
Wondered if the porch posts holding up porch roof have to be above the concrete piers.
Probably would depend on the porch roof load.
The deck extends out a little,
What's "a little"?
More info required, pics might help too.
Alternative answer "Consult an Engineer."
Joe H
Doubled 2x8 joists will extend about 6 inches past beam they are sitting on. Only doubled under posts, single joists will run parallel to house between these so decking on top is coming straight out from house like it was done years ago. Engineer spec'd the piers but did not say anything about post placement on the drawing.
dockelly,
I personally would not deviate from stacking posts on top of posts with only a double 2x8 beam. The reason is that I recently ran the calculations for bending moment of a similar project (I am not a PE but I know how to do the numbers). So, using a spruce beam and considering dead loads of porch roof and snow load (New England). I arrived at a requirement for a triple 2x8 beam to support the rafters and/or porch joists - extrapolating from this to your situation, I would not feel comfortable about the point loads of your posts on only 2x8.
Pete
If I understand you correctly, the 2x8 with the post to post you think is ok, with the post on 2x8 without post beneath not ok? Also did you see the pictures, porch is only 6 ft deep at front of house, 6 and a half at side. Roof, therefore, also small.
I was just citing my beam calc's as a way to show that I'd found that a roof, with 10 psf dead load and 40 psf snow load, was just a tad too much when spread across rafters over a double 2x8 beam, supported 8' OC. Point loads would make that worse, unless using that rule of thumb that Piffin cited about moving the post up to the width of the beam off the supporting post.
After reading all the posts and checking the humongous pictures, I'll admit I'm still a little confused about what you're tryin to do.
see my post to Piffin, I'll take more pictures tomorrow.
The typical rule of thumb for something like this is that with your floor joist 7.25" tall, the offset of the pier to suport post can be as much as 7.25" = the depth of joist.I have been waiting for this photo do download but it doesn't really show me much.Since you are in an area where there is no snow load requirement, a 6' deep porch could almost be framed with 2x6, so the 2x8 is overkill just a hair, enough for some cushion.I think you said you are slidingover about 6"?
You are fine with that, IMO.The only Q is whether your BI thinks like I do.
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bump
anybody home?
I'm home but it took 20 minutes for the photo to download. You gotta learn to be patient or to resize those monsters to about 100KB;)
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hey Piffin,This is a test, says 976 kb, which I think is even larger. I'll try again. Looked back and it is larger. I right click photo and it says resize, and I choose small, obviously not small enough. The pictures were to show original posts were not evenly spaced, and to show the size of the roof. The rule of thumb you speak of, 7.25 right or left given beam size is not my situation. 6" was the amount the joist extends past beam. I'll probably have to come up with another plan, even if posts are spaced unevenly. Sorry if I sounded like a smartass :) I'll work on the picture sizing.
Thanks
Kevin
Edited 11/27/2007 11:05 pm ET by dockelly
How's this Piff? I went through some old posts on Irfanview, think I got it. Picture was picked randomly, not relevant to my discussion, I just wanted to get the resizing thing figured out.Thanks
DocPS let me know if it works on your computer.
Posted to myself, meant it to be you. See above post please.
I guess I misunderstand your setup there on th e porch framing. R U saying that the post location will be nowhere near the piers under?The way I understand this now is that you have a double 2x8 beam over the piers and parallel to the foundation. The joists run perpendicular to the foundation and that beam over the top of it.Is that right? and is that beam directly under the beam above that the porch posts are supporting?No sweat - you aren't a smartazz, I am.Picture size finally down decent size. Lat night I was watching a TV show is only reason I even tried to download that one. Normally 200KB is my upper limit
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Hi Piffin,I've attached 2 pictures front and side of the house. The front shows the beam in place, the 2x8 above would be the rim joist set up to get the correct beam height. The piers are pretty much ok, there is one behind the 2x4 to the right of the door with some bricks on top. These piers where put there because the footings were there. At this point most line up ok if I put the post directly over them, I may have to pour some new piers to work out the others, maybe 2. "and is that beam directly under the beam above that the porch posts are supporting" NO, it is set back about 6 inches. The doubled 2x8 on top of beam will have the post attached to it. I wanted the piers back a little so they wouldn't be seen and interfere with lattice work. In hindsight, I would of had the porch roof beam and that beam line up ."The joists run perpendicular to the foundation and that beam over the top of it." Only the doubled 2x8's that will have a post sitting on top run perpendicular to foundation. Between the doubles will run single 2x8's parallel to foundation so decking will run traditional, perpendicular to house.PS the bracing you see is where the original posts were, 3-4" over. As you can see they did not line up with concrete either, doubled up rim joist sitting on concrete block, decking above and post on top of decking.
Edited 11/28/2007 10:22 pm ET by dockelly
I think I am starting tosee this. Now what is the BEAM made of? and how far offset the piers would the doubled 2x8 run aross it/
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There's only two piers involved. One is 20" offset, the other about 6". Spoke with the BI and he didn't see a problem. If they change their mind when they inspect, it would be fairly easy to put a new pier in, weather permitting. Bought the Bostich strapshot today, great little gun. Wanted to take pictures but the battery was done, next time.
Thanks
Kevin
PS How's the fibromyalgia battle going?
hey to bad u got a slow internet. :)