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Posted: 8/15/2015 1:59:42 PM EDT
I have tried to find this info on the web and to no luck.

I am basically building a lean to off the side of an existing shed that will be 20ft wide and 50ft long, with 6x6's cementing into the ground and then strapped to the slab once it's poured.

I am using some 26 gauge metal roofing. No snow load down here, but wind's can get serious.
Link Posted: 8/15/2015 3:43:25 PM EDT
[#1]
I'd do 16" on center rafters and 2' furring.
Link Posted: 8/15/2015 3:48:25 PM EDT
[#2]
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Quoted:
I'd do 16" on center rafters and 2' furring.
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damn, that's going to be a lot of 2x6's.
Link Posted: 8/15/2015 4:02:03 PM EDT
[#3]
Careful, this could turn into a clusterfuck like the roof truss thread did.
Link Posted: 8/15/2015 4:09:24 PM EDT
[#4]

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Quoted:


Careful, this could turn into a clusterfuck like the roof truss thread did.
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Hit up Codyboy



 
Link Posted: 8/15/2015 4:11:37 PM EDT
[#5]
Seriously, WTF?  You can't just build a lean-to without consulting and engineer.  Also an architect and general contractor would make more sense.  You think you can just go out and build a lean-to?  
Link Posted: 8/15/2015 4:16:10 PM EDT
[#6]
Are you inside the city limits? Or under any sort of building code?

Link Posted: 8/15/2015 4:18:29 PM EDT
[#7]
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Quoted:
Seriously, WTF?  You can't just build a lean-to without consulting and engineer.  Also an architect and general contractor would make more sense.  You think you can just go out and build a lean-to?  
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Yes.  Along with whatever additions I feel like building.  <<shrugs>>
Link Posted: 8/15/2015 4:22:31 PM EDT
[#8]
You can find span tables on the internet.

Do you have access to 20ft long 2x6s?  Finding them could be a challenge, and expensive.

Also, 20 ft is a long span for a 2x6, even at 16" o.c., and since we don't know what you are loading the roof with, 2x6s at 16" o.c. may not even be enough.  Purlin spacing will depend primarily on what you are attaching to the rafters.
Link Posted: 8/15/2015 4:24:48 PM EDT
[#9]
Quoted:
I have tried to find this info on the web and to no luck.

I am basically building a lean to off the side of an existing shed that will be 20ft wide and 50ft long, with 6x6's cementing into the ground and then strapped to the slab once it's poured.

I am using some 26 gauge metal roofing. No snow load down here, but wind's can get serious.
View Quote



What part of Louisiana are you in? I'm from Nola but moved to the ArkLaMiss area about a year ago. Weather / humidity is drastically different from back home.
Link Posted: 8/15/2015 4:25:33 PM EDT
[#10]
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Quoted:


damn, that's going to be a lot of 2x6's.
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Quoted:
Quoted:
I'd do 16" on center rafters and 2' furring.


damn, that's going to be a lot of 2x6's.


That's a long span for a 2x6. May wanna go with 2x8 or 2x10 even. You can go 24" centers then.
Link Posted: 8/15/2015 4:25:42 PM EDT
[#11]
The length of the rafters will be the deciding factor. With metal roofing, 2' OC should be good for the purlins. Probably the same for rafters. The longer they are, the closer they should  be.

ETA: 20 feet is too long for 2x6s in almost any arrangement.
Link Posted: 8/15/2015 4:39:51 PM EDT
[#12]
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Quoted:
The length of the rafters will be the deciding factor. With metal roofing, 2' OC should be good for the purlins. Probably the same for rafters. The longer they are, the closer they should  be.

ETA: 20 feet is too long for 2x6s in almost any arrangement.
View Quote



How far apart are the vertical members?  16 feet with two foot of overhang on each end or are you using a structure for load bearing on one end?

Do it right even if it costs more.
Link Posted: 8/15/2015 4:49:28 PM EDT
[#13]
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Quoted:
Seriously, WTF?  You can't just build a lean-to without consulting and engineer.  Also an architect and general contractor would make more sense.  You think you can just go out and build a lean-to?  
View Quote


lol, I'll have to do that shit by my house, but out in the country zero fucks are given.
Link Posted: 8/15/2015 4:49:46 PM EDT
[#14]
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Quoted:
Are you inside the city limits? Or under any sort of building code?

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nope, in the swamp.
Link Posted: 8/15/2015 4:50:18 PM EDT
[#15]
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Quoted:



What part of Louisiana are you in? I'm from Nola but moved to the ArkLaMiss area about a year ago. Weather / humidity is drastically different from back home.
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Quoted:
Quoted:
I have tried to find this info on the web and to no luck.

I am basically building a lean to off the side of an existing shed that will be 20ft wide and 50ft long, with 6x6's cementing into the ground and then strapped to the slab once it's poured.

I am using some 26 gauge metal roofing. No snow load down here, but wind's can get serious.



What part of Louisiana are you in? I'm from Nola but moved to the ArkLaMiss area about a year ago. Weather / humidity is drastically different from back home.


Humidity sucks, lol

Houma area.
Link Posted: 8/15/2015 4:51:58 PM EDT
[#16]
Discussion ForumsJump to Quoted PostQuote History
Quoted:



How far apart are the vertical members?  16 feet with two foot of overhang on each end or are you using a structure for load bearing on one end?

Do it right even if it costs more.
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
The length of the rafters will be the deciding factor. With metal roofing, 2' OC should be good for the purlins. Probably the same for rafters. The longer they are, the closer they should  be.

ETA: 20 feet is too long for 2x6s in almost any arrangement.



How far apart are the vertical members?  16 feet with two foot of overhang on each end or are you using a structure for load bearing on one end?

Do it right even if it costs more.


trying to go as wide as possible. the other end is attached to a metal building.

It's just to get my boat out of the sun.
Link Posted: 8/15/2015 5:17:46 PM EDT
[#17]
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Quoted:


damn, that's going to be a lot of 2x6's.
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Quoted:
Quoted:
I'd do 16" on center rafters and 2' furring.


damn, that's going to be a lot of 2x6's.


If you're doing a 2x6 with center beam 12" and balloon wall on each end.
Link Posted: 8/15/2015 5:34:47 PM EDT
[#18]
6-8' centers on rafters, 4' on furring. That is assuming you are using 2x for furring. The rafters need to be closer together if you use 1x furring.
Link Posted: 8/15/2015 5:39:50 PM EDT
[#19]
20' span is a hell of a stretch for a 2x6.  It might say pretty badly eventually, but maybe you don't care.  

Are you going to hang much over the support at the bottom?  Let it run a few feet over if you can.
Link Posted: 8/15/2015 5:48:49 PM EDT
[#20]

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Quoted:


Careful, this could turn into a clusterfuck like the roof truss thread did.
View Quote


As a carpenter, I'll just sit back and smile at all the goofy advice.



 
Link Posted: 8/15/2015 5:51:27 PM EDT
[#21]
By using a peaked rafter assembly (Yes, not a lean to). you can achieve what you want with 2x6 at two foot centers.



ETA: four foot centers on furring would be fine.
Link Posted: 8/15/2015 6:04:33 PM EDT
[#22]
thanks for all the replies.

I think I have more questions now. lol

I may go with 2x4x8's spaced 3' apart, with the furrings 4 feet apart.

It's just a sunshade.

Unless this isn't going to work, then I'll have to reconfigure.
Link Posted: 8/15/2015 7:13:29 PM EDT
[#23]
Link Posted: 8/15/2015 7:21:17 PM EDT
[#24]
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Quoted:

As an engineer and proficient amateur carpenter, I'll just sit back and smile at all the goofy advice.
 
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Quoted:
Quoted:
Careful, this could turn into a clusterfuck like the roof truss thread did.

As an engineer and proficient amateur carpenter, I'll just sit back and smile at all the goofy advice.
 

Slight edit to explain my viewpoint. Let the hilarity ensue.
Link Posted: 8/15/2015 7:29:13 PM EDT
[#25]
If you go to southernpine.com  they have load and span tables. OP., what you are wanting to build sounds rather large for somebody who has to ask this kind of question.
Link Posted: 8/15/2015 7:31:21 PM EDT
[#26]
Instead of laughing, why not contribute? OP is asking for help.
Link Posted: 8/15/2015 8:23:38 PM EDT
[#27]
Op, send me an IM.  I'm an engineer with a lot of construction experience.  I'll talk you through it on the phone if you want and get you squared away.

Serious offer.  I'm not stamping anything, but I'll get you moving in the right direction.
Link Posted: 8/15/2015 8:42:19 PM EDT
[#28]
Link Posted: 8/15/2015 8:59:21 PM EDT
[#29]
I wouldn't trust 2x6's out to 20', seen too many of them start sagging.  Farthest I would be comfortable going would be 16', and even then you still run the risk of sagging.  I can't see your location, but is there any issues with snow?  

As far as the furring strips, you can go every 2', but they're not necessary if you keep your rafters on 16" centers.  I've seen a lot of barns built here locally this way, and recently built a 24x36' in the same manner.  I also used 26 ga 5v metal roofing, all 3' wide.  Its been that way for 2+ years, without a single issue.  Of course, we don't have snow loading issues, so your results may not be the same.

Now, if I could do it over again, I would have run OSB on the roof under the tin.  At the time, OSB was $13/sheet, and I was too cheap to spend the extra cash.  I'm actually in the process of building another 24x32' building, and this one will use OSB on the roof (now that it is $6/sheet).
Link Posted: 8/15/2015 9:01:14 PM EDT
[#30]
Google span tables, pick the deflection you are comfortable with. Same thing an engineer would do. For a lean to on a she you can have a pretty good amount of deflection and be safe.





The rest of the htead is "it worked, it didn't work" etc...you'll get numbers of bewteen 16" and 24" depending on the size of your faters and lumber grade, span and what deflection you need for most of what you would normally put in a lean to.



We dn't have bulding codes here so whatever. Unless it's a retail/commercial building you're on your own for what you want to do.



 
Link Posted: 8/15/2015 9:09:53 PM EDT
[#31]
http://www.southernpine.com/app/uploads/SPtable17_060113.pdf

Even at the lightest load you would need 2x8s 12" on center.... Number 1s

Assuming I grabbed the right table.

20' is a big stick.  Any chance you can get rough sawn oak?  Once that dries it will be stronger than the pine.
Link Posted: 8/15/2015 9:10:17 PM EDT
[#32]
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Quoted:
Op, send me an IM.  I'm an engineer with a lot of construction experience.  I'll talk you through it on the phone if you want and get you squared away.

Serious offer.  I'm not stamping anything, but I'll get you moving in the right direction.
View Quote


thanks i'll shoot you one on Monday after I sketch something up.
Link Posted: 8/15/2015 9:12:18 PM EDT
[#33]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
http://www.southernpine.com/app/uploads/SPtable17_060113.pdf

Even at the lightest load you would need 2x8s 12" on center.... Number 1s

Assuming I grabbed the right table.

20' is a big stick.  Any chance you can get rough sawn oak?  Once that dries it will be stronger than the pine.
View Quote


I doubt I could get oak. I could get cypress though.
Link Posted: 8/15/2015 9:13:46 PM EDT
[#34]
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Quoted:
If you go to southernpine.com  they have load and span tables. OP., what you are wanting to build sounds rather large for somebody who has to ask this kind of question.
View Quote


well, I can follow directions and I have gutted and re built homes and built other structures.
Link Posted: 8/15/2015 9:22:40 PM EDT
[#35]
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Quoted:


well, I can follow directions and I have gutted and re built homes and built other structures.
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Quoted:
Quoted:
If you go to southernpine.com  they have load and span tables. OP., what you are wanting to build sounds rather large for somebody who has to ask this kind of question.


well, I can follow directions and I have gutted and re built homes and built other structures.



Fair enough, best of luck to you.
Link Posted: 8/15/2015 9:31:33 PM EDT
[#36]
You could add another support down the middle so your only going out 10' instead of 20' on each rafter and then you could easily do 36" apart with a 2x6 for a roof as you are describing but it will mean a few more posts in the middle. With a "pole barn" style shouldn't be an issue.

But 20' isn't going to happen with 2x6's without fear of sag or failure in my opinion.

I've done 12' with 2x6's on 24" centers and they have held up just fine. Wouldn't do more than that though.

Link Posted: 8/15/2015 9:33:38 PM EDT
[#37]
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Quoted:


thanks i'll shoot you one on Monday after I sketch something up.
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Quoted:
Quoted:
Op, send me an IM.  I'm an engineer with a lot of construction experience.  I'll talk you through it on the phone if you want and get you squared away.

Serious offer.  I'm not stamping anything, but I'll get you moving in the right direction.


thanks i'll shoot you one on Monday after I sketch something up.



Perfect, I'm about to die in this 80 F and 50% humidity I was whining about in that other thread.  I don't think I can talk to a guy from Louisiana till I get into some AC.
Link Posted: 8/15/2015 9:43:34 PM EDT
[#38]
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Quoted:



Perfect, I'm about to die in this 80 F and 50% humidity I was whining about in that other thread.  I don't think I can talk to a guy from Louisiana till I get into some AC.
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Quoted:
Op, send me an IM.  I'm an engineer with a lot of construction experience.  I'll talk you through it on the phone if you want and get you squared away.

Serious offer.  I'm not stamping anything, but I'll get you moving in the right direction.


thanks i'll shoot you one on Monday after I sketch something up.



Perfect, I'm about to die in this 80 F and 50% humidity I was whining about in that other thread.  I don't think I can talk to a guy from Louisiana till I get into some AC.


LoL
Link Posted: 8/15/2015 11:38:01 PM EDT
[#39]

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Quoted:
Perfect, I'm about to die in this 80 F and 50% humidity I was whining about in that other thread.  I don't think I can talk to a guy from Louisiana till I get into some AC.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Quoted:



Quoted:


Quoted:

Op, send me an IM.  I'm an engineer with a lot of construction experience.  I'll talk you through it on the phone if you want and get you squared away.



Serious offer.  I'm not stamping anything, but I'll get you moving in the right direction.





thanks i'll shoot you one on Monday after I sketch something up.






Perfect, I'm about to die in this 80 F and 50% humidity I was whining about in that other thread.  I don't think I can talk to a guy from Louisiana till I get into some AC.


Being from LA that sounds more like fall of the year rather than summer.



 
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