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What is causing my roof to droop? #4585856
11/26/17 04:40 PM
11/26/17 04:40 PM
Joined: Apr 2013
Posts: 5,898
FL, USA
gregk24 Offline OP
gregk24  Offline OP
Joined: Apr 2013
Posts: 5,898
FL, USA
As you can see from the picture, the roof over my carport is sagging. Many of the houses in my neighborhood (most built in the 50's) are the same way. What causes this and do you think its a problem or just cosmetic? I was up on the roof putting up Christmas lights a week ago and it did NOT feel soft or bouncy walking on it.



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Re: What is causing my roof to droop? [Re: gregk24] #4585870
11/26/17 04:48 PM
11/26/17 04:48 PM
Joined: Nov 2008
Posts: 3,277
Oshawa, Ontario Canada
JC1 Offline
JC1  Offline
Joined: Nov 2008
Posts: 3,277
Oshawa, Ontario Canada
Are you able to get into that attic section of the roof to see the structure? Could.be joists shifting or plywood getting soft. Or is the sheathing thsoe strips of wood that they used to use a long time ago?


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Re: What is causing my roof to droop? [Re: JC1] #4585874
11/26/17 04:51 PM
11/26/17 04:51 PM
Joined: Sep 2007
Posts: 1,022
TX, USA
JMJNet Offline
JMJNet  Offline
Joined: Sep 2007
Posts: 1,022
TX, USA
Originally Posted By: JC1
Are you able to get into that attic section of the roof to see the structure? Could.be joists shifting or plywood getting soft. Or is the sheathing thsoe strips of wood that they used to use a long time ago?


I agree, no way of knowing unless somebody is looking what is going on underneath.
May be the underlayment board broke or the supporting wood broke.

They are not designed to last for 60 years.

Last edited by JMJNet; 11/26/17 04:51 PM.

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Re: What is causing my roof to droop? [Re: gregk24] #4585899
11/26/17 05:10 PM
11/26/17 05:10 PM
Joined: Jun 2002
Posts: 6,439
MI
doitmyself Offline
doitmyself  Offline
Joined: Jun 2002
Posts: 6,439
MI
Built in the 50's, I'm going to guess that it is conventional rafter design (vs. trusses). That it is happening only over the car port is your first good clue. I would look at the front and back fascia areas to see if they look pushed out a tiny bit, allowing the ridge to sag. My guess is that they continued the same roof design over the car port that they used on the rest of the house. But, the car port has almost nothing (no front/side/center bearing walls) supporting and holding the rafter system together as the "locked together" unit it is designed to be. Or, maybe that HUGE joist span over the car port is just too long. Look for sagging joists too, which would allow the ridge to sag.

An inspection by a trustworthy builder would reveal the root cause. Since you have no snow load in Florida, and if their are no major structural deficiencies (i.e., cracked ridge board, etc.), it might be just a cosmetic thing. There are sagging roofs that have lasted for centuries.

Re: What is causing my roof to droop? [Re: gregk24] #4585930
11/26/17 05:45 PM
11/26/17 05:45 PM
Joined: Sep 2004
Posts: 21,925
Orlando, FL
Mr Nice Offline
Mr Nice  Offline
Joined: Sep 2004
Posts: 21,925
Orlando, FL
I don't like all that weight only supported by two steel poles.

A roofer has a better idea and knowledge of why your roof is lower.

Re: What is causing my roof to droop? [Re: gregk24] #4585938
11/26/17 05:52 PM
11/26/17 05:52 PM
Joined: Dec 2004
Posts: 9,625
1/2 hr N.E. of Detroit
Triple_Se7en Offline
Triple_Se7en  Offline
Joined: Dec 2004
Posts: 9,625
1/2 hr N.E. of Detroit
Where are your roof vents?
Also, how much insulation is under that roof and is any insulation-roll attached directly to the inside of the roof - between the beams?

Last edited by Triple_Se7en; 11/26/17 05:53 PM.

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Re: What is causing my roof to droop? [Re: gregk24] #4585951
11/26/17 06:05 PM
11/26/17 06:05 PM
Joined: Mar 2004
Posts: 21,105
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 21,105
Upstate NY
Best would be to get a structural engineer. They might be $80 per hour and he should be able to examine the roof and write a report in 2-3 hours. But he will need to get into the attic area to look.

Roof trusses are engineered and so they should not be a problem assuming no insect or water damage. I spent my college summers building way too many roof trusses, using massive machines to press the plates into the wood.


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Re: What is causing my roof to droop? [Re: gregk24] #4585985
11/26/17 06:39 PM
11/26/17 06:39 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
Taiwan
Gravity

Re: What is causing my roof to droop? [Re: gregk24] #4585997
11/26/17 06:47 PM
11/26/17 06:47 PM
Joined: Sep 2004
Posts: 7,810
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,810
Marshfield , MA
Not enough of a collar tie on the rafters. Looks easy to fix though. Put a couple of A shores up under the fascia to carry rafters and ceiling joists put a couple A shores at half span of the ceiling Jack up shores an inch above where they were. Install collar ties or a W tying a rafter to to a ceiling joist.


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Re: What is causing my roof to droop? [Re: gregk24] #4586002
11/26/17 06:58 PM
11/26/17 06:58 PM
Joined: Feb 2010
Posts: 4,838
Central Texas
sleddriver Offline
sleddriver  Offline
Joined: Feb 2010
Posts: 4,838
Central Texas
If built in the 50's, then odds are it was stick framed. What's the distance, front-to-back?


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Re: What is causing my roof to droop? [Re: gregk24] #4586024
11/26/17 07:20 PM
11/26/17 07:20 PM
Joined: Jul 2015
Posts: 4,026
New England
madRiver Offline
madRiver  Offline
Joined: Jul 2015
Posts: 4,026
New England
Plenty of homes around here with similar roofs. However built between 1690 to 1850 and it simply adds character.

Re: What is causing my roof to droop? [Re: Ducked] #4586057
11/26/17 07:39 PM
11/26/17 07:39 PM
Joined: Oct 2014
Posts: 1,074
SW Ontario Canada
KGMtech Offline
KGMtech  Offline
Joined: Oct 2014
Posts: 1,074
SW Ontario Canada
Originally Posted By: Ducked
Gravity


And entropy. Maybe with some termites adding to the molecular chaos.

Last edited by KGMtech; 11/26/17 07:43 PM.

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Re: What is causing my roof to droop? [Re: gregk24] #4586059
11/26/17 07:40 PM
11/26/17 07:40 PM
Joined: Mar 2017
Posts: 6,492
...
PimTac Offline
PimTac  Offline
Joined: Mar 2017
Posts: 6,492
...
As suggested already, you or someone needs to get up into the attic. There are a lot of causes for a sagging roof and since you are in Florida the first thing I thought of was termites. A visual inspection is needed.

Also check your storage room too. Does the door open smoothly? Any signs of settling?


Cannot see signatures any longer so it doesn’t matter.
Re: What is causing my roof to droop? [Re: gregk24] #4586092
11/26/17 08:16 PM
11/26/17 08:16 PM
Joined: Oct 2014
Posts: 4,039
Utah
CKN Offline
CKN  Offline
Joined: Oct 2014
Posts: 4,039
Utah
You can start with a roofer-then a structural engineer-if needed.



Last edited by CKN; 11/26/17 08:17 PM.
Re: What is causing my roof to droop? [Re: gregk24] #4586093
11/26/17 08:17 PM
11/26/17 08:17 PM
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
The steel poles are good for like 10,000 each as long as kept "in column". The sag is not effective collar ties.

Jack up the center +1" in the middle. Install some 2x6 collar ties from rafter to rafter and let it settle. Use modern self tapping screws and some good PL8X on the faces to be joined. Should come out pretty straight smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
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