SparkChaser
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join:2000-06-06
Downingtown, PA
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| Old roof sheathing problem
Our house is about 35 yo. This past summer I noticed a strange bump in the roof. I waited until it was cooler to go take a look and here's what I found. (try to ignore that splintered piece  )
The sheathing has warped apparently (arrow in photo) and is not level with the one next to it. This is the only spot I see. The roof itself is still in decent shape and I don't want to replace it at this time.
I'm thinking of just running a support between the trusses and forcing the sheathing back into place. Anybody see anything wrong with this?
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jack b
Gone Fishing
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| What's up with that splintered piece, anyway... 
24 inch spacing? looks like 2x6 rafters, What is the roof pitch? Get much snow?
You could whack the seam flush inside there and slide in a piece of 2x4 under it to hold it.
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SparkChaser
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| said by jack b  :What's up with that splintered piece, anyway... 24 inch spacing? looks like 2x6 rafters, What is the roof pitch? Get much snow? You could whack the seam flush inside there and slide in a piece of 2x4 under it to hold it. The pitch is about 4/12 - 5/12. We haven't gotten much snow in the last 10 years and this is right at the top where the wind usually blows it away. I was thinking along your line and sticking a 2X4 in there.
The splintered wood - I don't know why it's there. I was trying to pry it up (with out tools) to see and it broke. I'll fix it when I go back up.
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"Facts do not cease to exist because they are ignored." - Aldous Huxley
"Children will not remember you for the material things you provided, but for the feeling that you cherished them." - Richard Evans |
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3SGTE
ST215W
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there
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| reply to SparkChaser
Leave the splintered hunk in there.
It may be that the sagging piece didn't line up with the truss that the splintered board is attached to. If this is the case, then there are also likely nails down into it through the top of the sheathing.
This would also partially explain the sag now.
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dgilbert
Good Bye My Friend
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clubs: | reply to SparkChaser
if you see a bump on the outside, it it the other piece raised up, not the one that appears to dip. raising it will only make the bump worse.
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SparkChaser
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Downingtown, PA
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| reply to SparkChaser
3SGTE excellent point. I didn't think of nails from the roof could be in it.
dgilbert I don't think that's the case. Perhaps my description is not correct. I think it's a depression that makes it look like a bump. (if that makes any sense  ) It's a very valid point, though, and I'll triple check it before I do anything. |
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Msradell
join:2008-12-25
Louisville, KY
1 edit | reply to SparkChaser
Another interesting thing I noticed in your picture is that there are no nails penetrating the sheathing. Normally quite a few of them will penetrate at least a small distance. Makes me wonder if there are some other problem in this situation? |
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tschmidt
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| said by Msradell :Another interesting thing I noticed in your picture is that there are no mails penetrating the sheathing. Lack of nail penetration was the first thing I noticed when I saw the picture. Inside of most roofs look like medieval torture device.
Bracing sheathing from underneath should be fine. I though common practice with 24" rafter spacing was to use sheathing clips to prevent what you are seeing.
»www.strongtie.com/products/conne···PSCA.asp
/tom |
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c4junk
Premium
join:2004-05-08
| reply to SparkChaser
I see a few nails, it seems like there should have been a clip between the sheets unless this is tongue and groove- and I would think that in a snow area it's 1/2 or 5/8 ply and maybe 3/4- that many years ago in Fl they were using some 3/8 on roofs-looked like crap in a few years.
A 2/4 or 2/6 brace should work fine to push up that dip. |
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seederjed
join:2005-02-28
Snellville, GA | reply to tschmidt
We only clipped OSB sheathing. Plywood was strong enough at the edges that it wasn't needed. |
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Icarus
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| reply to SparkChaser
Im wondering why this is a problem? Does it leak? Is the bump on the roof holding back water or debris? Is it that unsightly that it requires a fix?
A 2"x4" nailed between the rafters will likely just warp as well. If any fix is needed use the 2"x4" and jack it into place from the attic floor.
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SparkChaser
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| said by Icarus :Im wondering why this is a problem? Does it leak? Is the bump on the roof holding back water or debris? Is it that unsightly that it requires a fix? Like the mountain climbing answer, because it's there. I don't think a 2X4 would warp. Half in ply vs 3 1/2 in solid wood.
The nails were more noticeable on the original roof. When I had it re-shingled they must have used shorter nails. I've never had a loose shingle or nail pop so I guess they hold.
I rechecked the roof from the top and it is a depression which gives the appearance of a bump. Sorry for the confusion.
Thanks for all the good comments and suggestions.
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"Facts do not cease to exist because they are ignored." - Aldous Huxley
"Children will not remember you for the material things you provided, but for the feeling that you cherished them." - Richard Evans |
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Warzau
Premium
join:2000-10-26
Naperville, IL
clubs: | reply to Msradell
I was going to say the same, and boy do I hate when you work up in a attic and you bump your head, OUCH!!! |
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WutanG
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join:2001-12-12
Seaford, DE
clubs:
| reply to SparkChaser
Probably due to no H-clips and a minor leak that allowed it to swell and warp. 2ft rafters doesn't help either. Doesn't look much more than 1/2" plywood either(hard to say).
Might want to take it a step further and check for possible leaks. It sucks but I think this is why it happened. Especially if you don't notice this anywhere else.
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sbcretired
join:2006-01-07
Scottville, MI | reply to SparkChaser
With the lack of roofing nails thru the plywood, makes me wonder if they didnt use one of those "staple guns" to fasten shingles down. |
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AnonEMouse
@rr.com
| reply to SparkChaser
I've had a problem like this where the roofers forgot to put a H clip in. I thought nothing of it when I first noticed it; long after I forgot about it about 5 years later it got bad enough that it ripped the tar paper and left a indention/tear in the shingle above it, and during a rain storm it leaked mildly.
Was not hard fixing the warp/bow, I used a 2x6 and placed it between the sheets where the bow is. I found that it was easy enough to press the board back into place by hand and was able to get the 2x6 snug and the plywood even without any cranes or jacks. |
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SparkChaser
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| reply to WutanG
said by WutanG :Probably due to no H-clips and a minor leak that allowed it to swell and warp. 2ft rafters doesn't help either. Doesn't look much more than 1/2" plywood either(hard to say). Might want to take it a step further and check for possible leaks. It sucks but I think this is why it happened. Especially if you don't notice this anywhere else. Yeah, there is a lot wrong with the construction. The original developer was as crooked as they come. We just didn't know it at the time of purchase. 
As for leaks, I checked inside and don't see anything but that doesn't mean that some moisture isn't getting in between the shingles and top of the plywood. I'll look better from the outside.
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"Facts do not cease to exist because they are ignored." - Aldous Huxley
"Children will not remember you for the material things you provided, but for the feeling that you cherished them." - Richard Evans |
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shdesigns
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Stone Mountain, GA
·Atlantic Nexus
| Mine had similar problems. They left no gaps between the sheets so, when it swelled up as humidity changed, it buckled.
When i redid the roof, I ran a saw down each seam to add a gap for expansion.
1/2" seems too thin for 24" centers. Mine is 1/2" on 16" and you still get some warping.
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