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Carpenter roof advice sagging roof #6535516
05/10/19 10:54 PM
05/10/19 10:54 PM
Joined: Mar 2010
Posts: 3,035
wyoming southeast
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danvee Offline OP
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danvee  Offline OP
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I have a roof on a shop that is sagging I am all most certain that the trusses were made with the the crowns put down. I need to re-shingle is there a way i can level it with out replacing trusses??

Re: Carpenter roof advice sagging roof [Re: danvee] #6535559
05/10/19 11:30 PM
05/10/19 11:30 PM
Joined: Aug 2011
Posts: 45,261
james bay frontierOnt.
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Boco Offline
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james bay frontierOnt.
If its just cosmetic,why bother.
Is the ridge straight?

Last edited by Boco; 05/10/19 11:30 PM.

Forget that fear of gravity-get a little savagery in your life.
Re: Carpenter roof advice sagging roof [Re: danvee] #6535576
05/10/19 11:48 PM
05/10/19 11:48 PM
Joined: Apr 2012
Posts: 388
wisconsin, manitowoc
mutt Offline
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mutt  Offline
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wisconsin, manitowoc
Pull up the decking and sister a 2x to the truss that is saging.

But if they are all the same why bother. Unless it's a flat roof and the water is puddling in the sag. But then why would you be shingling a flat roof?

Re: Carpenter roof advice sagging roof [Re: danvee] #6535610
05/11/19 01:23 AM
05/11/19 01:23 AM
Joined: Dec 2006
Posts: 1,656
idaho falls idaho
trapr Offline
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trapr  Offline
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Posts: 1,656
idaho falls idaho
What kind of roof are you talking about?engineered trusses every 2 feet, or engineered trusses wide apart with perlins between?beam and rafter?

Re: Carpenter roof advice sagging roof [Re: danvee] #6535620
05/11/19 03:08 AM
05/11/19 03:08 AM
Joined: Jan 2008
Posts: 9,152
Alaska and Washington State
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waggler Offline
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Alaska and Washington State
I can't imagine your roof is sagging if it has trusses. Are you sure it doesn't just have rafters?
Many old roofs were framed with 2x4's - not very good. You can get up in the attic with a jack of some sort, place the jack in the middle of the rafter, jack it up until it's just a little crowned, then sister a good Douglas fir 2x6 alongside the 2x4. Use screws to fasten the two together.


"My life is better than your vacation"
Re: Carpenter roof advice sagging roof [Re: danvee] #6535628
05/11/19 04:12 AM
05/11/19 04:12 AM
Joined: Dec 2006
Posts: 29,750
williamsburg ks
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danny clifton Offline
"Grumpy Old Man"
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williamsburg ks
good luck finding douglas fir around here. I don't know what kind of chinese junk not even fit for firewood lumberyards around here are selling but I wouldn't build a chicken coop with it.


Those who would give up essential liberty, to purchase a little temporary safety, deserve neither liberty nor safety. Benjamin Franklin (1706-1790)
Re: Carpenter roof advice sagging roof [Re: danvee] #6535649
05/11/19 07:19 AM
05/11/19 07:19 AM
Joined: Jan 2007
Posts: 6,460
central Haudenosaunee, the De...
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white marlin Offline
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you're just a ray of sunshine, aren't you, danny?


j/k....

Re: Carpenter roof advice sagging roof [Re: danvee] #6535684
05/11/19 08:36 AM
05/11/19 08:36 AM
Joined: Dec 2006
Posts: 21,536
Sandhills Nebraska
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Gary Benson Offline
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Sandhills Nebraska
If they're on 24" centers rather than 16", not much you can do without going all-out.


Life ain't supposed to be easy.
Re: Carpenter roof advice sagging roof [Re: danvee] #6535694
05/11/19 08:47 AM
05/11/19 08:47 AM
Joined: May 2018
Posts: 361
NORTH DAKOTA
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Duckstick80 Offline
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NORTH DAKOTA
Are they hand made rafters? Trusses are engineered with webbing that prevents bowing from roof loads. You should post a few pics of the building and the roof system from the inside. It's difficult to tell you what to do without seeing it.

Re: Carpenter roof advice sagging roof [Re: danvee] #6535705
05/11/19 09:17 AM
05/11/19 09:17 AM
Joined: Dec 2006
Posts: 1,606
Maine
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shorthair Offline
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Maine
If it turns out to be cosmetic I'd strap it and throw metal on. shim the sags and you won't notice. Thats if you cant live with a sag


"My biggest worry is that my wife (when I'm dead) will sell my traps for what I said I paid for them."
Re: Carpenter roof advice sagging roof [Re: danvee] #6535722
05/11/19 09:48 AM
05/11/19 09:48 AM
Joined: Mar 2007
Posts: 35,124
McGrath, AK
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white17 Offline

"General (Mr.Sunshine) Washington"
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Posts: 35,124
McGrath, AK
Just adding a sister 2x6 next to the existing rafter won't help much. It needs to have other members in contact to transfer loads. The last thing you want to do is add more dead load in the form of new materials before finding out what the problem is.

More information is needed.

Are these engineered trusses or home built ? What are the dimensions of the various framing members ? What is the pitch of the roof ? Unsupported span ? What is your snow & wind load in that area.

It isn't uncommon for rafters to sag over time just due to deflection in the materials. But it IS uncommon to see that in an engineered truss.


Mean As Nails
Re: Carpenter roof advice sagging roof [Re: danvee] #6535728
05/11/19 09:51 AM
05/11/19 09:51 AM
Joined: Dec 2006
Posts: 8,104
Piney va. soon be 19
cotton Offline
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Piney va. soon be 19
what white17 said


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ifin your gonna be dumb ya gotta be tough
VTA life member

Re: Carpenter roof advice sagging roof [Re: danvee] #6539493
05/17/19 10:08 PM
05/17/19 10:08 PM
Joined: Mar 2010
Posts: 3,035
wyoming southeast
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danvee Offline OP
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Well got up in the attic and they are 2x4 hand made trusses and the ridge is straight and sturdy Im thinking they did not place the crowns up like it should have been done there is some webbing but they are for sure handmade with plywood gussets. Interesting the opposite side of the roof is straight with no sag.

Re: Carpenter roof advice sagging roof [Re: danvee] #6539498
05/17/19 10:09 PM
05/17/19 10:09 PM
Joined: Mar 2010
Posts: 3,035
wyoming southeast
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danvee Offline OP
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wyoming southeast
4/12 pitch 28 foot span very little snow load and what snow we do have is light, wind is crazy strong at times but its been up since 1995

Re: Carpenter roof advice sagging roof [Re: danvee] #6539505
05/17/19 10:14 PM
05/17/19 10:14 PM
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western mn
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bucksnbears Offline
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I really doute the crowns have anything to do with it!


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Re: Carpenter roof advice sagging roof [Re: danvee] #6539509
05/17/19 10:17 PM
05/17/19 10:17 PM
Joined: Dec 2006
Posts: 19,927
SEPA
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Lugnut Offline
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Are the bottom chords sagging where the webbing connects them to the top chord?


Eh...wot?

Re: Carpenter roof advice sagging roof [Re: danvee] #6539584
05/18/19 01:46 AM
05/18/19 01:46 AM
Joined: May 2018
Posts: 361
NORTH DAKOTA
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Duckstick80 Offline
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NORTH DAKOTA
Where is the webbing on the truss? A span that wide with a 2' over hang is around 17' of 2x4. A roof like that without webbing would deflect 2" if I walked on it.

Re: Carpenter roof advice sagging roof [Re: danvee] #6539668
05/18/19 08:09 AM
05/18/19 08:09 AM
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SEPA
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Lugnut Offline
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He said there is webbing:

Originally Posted by danvee
there is some webbing but they are for sure handmade with plywood gussets.


Eh...wot?

Re: Carpenter roof advice sagging roof [Re: Lugnut] #6539674
05/18/19 08:24 AM
05/18/19 08:24 AM
Joined: May 2018
Posts: 361
NORTH DAKOTA
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Duckstick80 Offline
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NORTH DAKOTA
Originally Posted by Lugnut
He said there is webbing:

Originally Posted by danvee
there is some webbing but they are for sure handmade with plywood gussets.


Correct but he didn't say if it was installed in the right places.

Re: Carpenter roof advice sagging roof [Re: danvee] #6539677
05/18/19 08:29 AM
05/18/19 08:29 AM
Joined: Dec 2006
Posts: 19,927
SEPA
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Lugnut Offline
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Originally Posted by Duckstick80
Correct but he didn't say if it was installed in the right places.


Unless he happens to be a truss engineer/designer, and it doesn't sound like he is, how would he know that?


Eh...wot?

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