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Need advice on roof structure add on shop
#7511035
05/13/19 04:45 PM
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Joined: Feb 2009
Posts: 5,872
GLC
OP
THF Trophy Hunter
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OP
THF Trophy Hunter
Joined: Feb 2009
Posts: 5,872 |
I have a 30 x 40 shop and want to add a roof awning to one side. I can get 2 x 6 x 20's for rafters? So here is the situation, roof structure slightly sloping, 40 foot deep and 20 foot to the side. (Slope will be the 20 ft direction) Thinking about telephone poles for posts, maybe 4 on the 40 foot span? Spacing on roof joists for the number I need in the 40 foot direction? Metal panels 3 foot wide and 20 foot long. Number of 2 x 4 x ? cleats to screw the tin on and spacing 20 foot direction? Guess this is mainly structural question to carry load of roof.
Last edited by GLC; 05/13/19 04:45 PM.
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Re: Need advice on roof structure add on shop
[Re: GLC]
#7511699
05/14/19 12:30 PM
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Joined: Jun 2007
Posts: 235
ChrisG
Woodsman
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Woodsman
Joined: Jun 2007
Posts: 235 |
I don't think you can get 20' 2x6s very easily. Why don't you set your post back 2' and have a 2' overhang. Then you can use 18' lumber which is easier to find. As far as spacing 2' oc is the norm but if its only holding tin 3' oc might make it easier and you are going to need some blocking at that length. I am not sure of the load values of a 2x6 on edge.
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Re: Need advice on roof structure add on shop
[Re: GLC]
#7511863
05/14/19 03:01 PM
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Joined: Feb 2009
Posts: 5,872
GLC
OP
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OP
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Yes, 20 footers are few and far between but there are some Home Depot stores that have them. Wondering if i should put another set of poles for support. Maybe extra set at 10 foot for weight load to support 20 foot span?
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Re: Need advice on roof structure add on shop
[Re: GLC]
#7511873
05/14/19 03:11 PM
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Joined: Sep 2012
Posts: 12,861
PMK
THF Celebrity
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THF Celebrity
Joined: Sep 2012
Posts: 12,861 |
I would have to run calculations for load, and I don't have the time right now ... but probably can find online calculators to do that.
when I was reflooring my 20' gooseneck trailer, about the only place I found that had 20' lumber worth a darn, was 84 Lumber. McCoy's had some but most was very warped and crooked on the 20' length ... but did use them for a 16' trailer. Couple of other options over Home Depot for you to check out.
"everyone that lives dies but not everyone who dies lived..."
~PMK~
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Re: Need advice on roof structure add on shop
[Re: GLC]
#7511888
05/14/19 03:26 PM
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Joined: Dec 2008
Posts: 22,630
Cast
THF Celebrity
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THF Celebrity
Joined: Dec 2008
Posts: 22,630 |
Do not forget about sawn telephone poles. The place in Bowie, they have long pieces of lumber.
Cast I have a short attention spa
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Re: Need advice on roof structure add on shop
[Re: Cast]
#7511907
05/14/19 03:48 PM
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Joined: Feb 2009
Posts: 5,872
GLC
OP
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OP
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Posts: 5,872 |
Do not forget about sawn telephone poles. The place in Bowie, they have long pieces of lumber. By any chance have a name for them?
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Re: Need advice on roof structure add on shop
[Re: GLC]
#7511912
05/14/19 03:56 PM
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Joined: Mar 2007
Posts: 5,225
Rustler
THF Trophy Hunter
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Posts: 5,225 |
Stice sawmill, Bowie.
I don't know much about using wood for that length run, I'd use metal c channel / pfc.
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Re: Need advice on roof structure add on shop
[Re: Rustler]
#7511926
05/14/19 04:08 PM
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Joined: Feb 2009
Posts: 5,872
GLC
OP
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OP
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Stice sawmill, Bowie.
I don't know much about using wood for that length run, I'd use metal c channel / pfc. By their facebook page, they have closed.
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Re: Need advice on roof structure add on shop
[Re: GLC]
#7511927
05/14/19 04:08 PM
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Joined: Dec 2008
Posts: 22,630
Cast
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My garage is 24x36. I spanned it with 24’ 2x8 SYP from HD. Go to contractor desk.
Cast I have a short attention spa
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Re: Need advice on roof structure add on shop
[Re: GLC]
#7524888
06/02/19 05:46 AM
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Joined: Mar 2009
Posts: 382
MRR
Bird Dog
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Bird Dog
Joined: Mar 2009
Posts: 382 |
2x6 won't span 20 feet without sagging , if you figure in any kind of load need at least 2x10 If you halve your span with another set of posts and a doubled 2x8 beam 2x6 would work.
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Re: Need advice on roof structure add on shop
[Re: GLC]
#7524943
06/02/19 12:51 PM
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Joined: Nov 2012
Posts: 336
phathawg
Bird Dog
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Bird Dog
Joined: Nov 2012
Posts: 336 |
2x10 more better. Do it right the 1st time.
There's only 2 seasons in a year. Deer season and getting ready for deer season.
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Re: Need advice on roof structure add on shop
[Re: Rustler]
#7524964
06/02/19 01:41 PM
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Joined: Jan 2014
Posts: 12,756
Paluxy
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I'd use metal c channel / pfc.
x2. I used to go wood on everything until I got tired of building it twice.
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Re: Need advice on roof structure add on shop
[Re: GLC]
#7526094
06/03/19 07:02 PM
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Joined: Jun 2006
Posts: 8,324
Dave Davidson
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Posts: 8,324 |
Agree on metal. Been there, done that too many times with wood.
Without a sense of urgency, nothing ever happens.
Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley, Rancher Muleshoe Texas 1892-1985 RIP
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Re: Need advice on roof structure add on shop
[Re: GLC]
#7534509
06/14/19 12:15 PM
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Joined: Feb 2011
Posts: 1,802
Black Duck Dog
Pro Tracker
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Pro Tracker
Joined: Feb 2011
Posts: 1,802 |
C Beams is definitely the wayI would go also !!!!!
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Re: Need advice on roof structure add on shop
[Re: MRR]
#7536885
06/18/19 12:56 AM
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Joined: Dec 2010
Posts: 6,849
hopalong
THF Trophy Hunter
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THF Trophy Hunter
Joined: Dec 2010
Posts: 6,849 |
2x6 won't span 20 feet without sagging , if you figure in any kind of load need at least 2x10 If you halve your span with another set of posts and a doubled 2x8 beam 2x6 would work.
this, you will also have to use bridging blocks at least in the center, I would do 2 rows on equal spacing.
lake fork FISHERMANS COVE MARINA - 903 474 7479 reservations
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