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Old 07-15-2009, 05:15 PM   #1
 
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Concerned newbie


Hello,
I built this porch covering after getting the run around from local builders who either felt the job was too small or they just didn't return my call. Anyway I am a little concerned with structural integrity. It is my first DYI project on structure. The cover is only attached by 2x6 joist for support only. The roof is 1/4 decking with 4x8 sheets of corregated roofing material that weigh 18 pounds per sheet. Overall there is very little weight on the structure. I explained the plans to the builder at Southerlands and he thought this would be plenty of support. I am really not wanting to put beams midway underneath, but may have too. The span between 4x6 post is 14'. Any suggestions? Ok, you pros can stop laughing!
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Last edited by skitch4110; 07-15-2009 at 05:18 PM.
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Old 07-15-2009, 05:30 PM   #2
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Where are you located? Snow load?

1/4" decking? I've seen 1/2" as the bare min
Is it sloped so rain will run off?



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Old 07-15-2009, 05:40 PM   #3
 
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I'm located in Oklahoma and actually the decking is 7/16 not 1/4. We have had planty of rain to test out the slope and it works very good! Snow load should be ok but not sure how to measure that.
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Old 07-15-2009, 06:00 PM   #4
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Well according to one span calc I use a 2x6 rafter with snow load will only span around 12' when installed 16" OC (on center). This depends upon species of wood & the grade - #2 grade being the normal every day wood you find - HD & Lowes

Span calc:

http://www.awc.org/calculators/span/...rcalcstyle.asp

You have a 4x6 in the middle of the ceiling as a beam
Are the outer beams also 4x6?
And the overall length is 28' ? - 14' between posts ?
There are more posts along the brick wall...or is that a gutter ?



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Old 07-15-2009, 06:29 PM   #5
 
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All beams are 4x6, there are 4 total beams from house to outside edge. (shown best in second picture) Thanks for the snow load calculator, I may have to modify this setup which can be done I just hate to change this far into it, but it's my fault for not using 6x6 beams $$$. The joist lengths are 8' and 6'. The span of the beams between post ( pic#2) is 14'.

Last edited by skitch4110; 07-15-2009 at 06:48 PM.
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Old 07-15-2009, 07:47 PM   #6
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Nope, hold on -- you might be OK
I was talking joist span - which if you only have 8' & 6' you are fine
The beam span is 14' 4x6 - I'll have to see if I can find a span calc for that
Unless someone else has a link



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Old 07-15-2009, 08:12 PM   #7
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In my area, great concern is taken by the building department about wind lift.
Have you taken into consideration this possibility?
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Old 07-15-2009, 08:33 PM   #8
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All I could find was spans based on total load per lineal foot 4" x 6" beams, but here you go anyway:
8' span w/ total load of 223#
10' span w/ total load of 142#
12' span w/ total load of 95#
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Old 07-15-2009, 09:38 PM   #9
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Quote:
Originally Posted by Wildie View Post
In my area, great concern is taken by the building department about wind lift.
Have you taken into consideration this possibility?
Same here. Are the 4x4 posts anchored to the slab?
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Old 07-15-2009, 09:53 PM   #10
 
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Not yet but they will be this weekend. I was thinking I could use a metal plate cut 4x6 to keep water from wicking ( any more) up the post on the porch floor. I have some concrete glue but have not used it before. I wanted to keep the post anchored but without hardware on the sides of them. Has anyone used this method before?
Thanks!
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Old 07-15-2009, 09:54 PM   #11
 
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Arioo1....Excellent! Thanks a bunch!

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Old 07-15-2009, 10:15 PM   #12
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Are those posts just sitting on the slab, or did you pour footings?

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Old 07-16-2009, 06:18 AM   #13
 
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They are sitting on the slab.
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Old 07-16-2009, 03:29 PM   #14
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Quote:
Originally Posted by skitch4110 View Post
They are sitting on the slab.
May be advisable to use ABU44 or ABU66 post anchors! This is what was engineered for my roof!

http://store.qualitydist.net/sst-abu66.html
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Old 07-16-2009, 04:07 PM   #15
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Quote:
Originally Posted by Scuba_Dave View Post
Nope, hold on -- you might be OK
I was talking joist span - which if you only have 8' & 6' you are fine
The beam span is 14' 4x6 - I'll have to see if I can find a span calc for that
Unless someone else has a link
Quote:
Originally Posted by ARI001 View Post
All I could find was spans based on total load per lineal foot 4" x 6" beams, but here you go anyway:
8' span w/ total load of 223#
10' span w/ total load of 142#
12' span w/ total load of 95#
The only calc I could find said that with joists & span & distance between beams you needed (2) 2x12's which = 3" x 9.25"
You have a 4x6 = 3.5" X 5.5"...so it seems the beams are undersized
But you need a deck person to confirm loads

You do need the posts connected to the cement pad
A good strong wind coming in is going to lift that whole thing right up
Might not happen for years...but it will happen
I do not think concrete glue will work - migh be wrong
The simpson strong tie is what you want - about $16 I think





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