http://www.dslreports.com/forum/Old-roof-sheathing-problem-23288681 en Fri, 10 Feb 2012 18:00:36 EDT Fri, 10 Feb 2012 18:00:36 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23294792
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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Scott Henion

Embedded Systems Consultant,
SHDesigns home - DIY Welder]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23294792 Thu, 05 Nov 2009 06:36:58 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23294750 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. :huh:

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]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23294750 Thu, 05 Nov 2009 06:11:00 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23292924
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.]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23292924 Wed, 04 Nov 2009 20:04:14 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23292427 http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23292427 Wed, 04 Nov 2009 18:36:42 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23292418
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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-Wooderson]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23292418 Wed, 04 Nov 2009 18:35:37 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23292070 http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23292070 Wed, 04 Nov 2009 17:26:43 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23291719 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]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23291719 Wed, 04 Nov 2009 16:26:12 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23291260
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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Team Helix- Folding@Home and Rosetta@Home]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23291260 Wed, 04 Nov 2009 15:13:32 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23291145 http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23291145 Wed, 04 Nov 2009 14:55:34 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23290097 A 2/4 or 2/6 brace should work fine to push up that dip.]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23290097 Wed, 04 Nov 2009 12:00:06 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23289539 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]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23289539 Wed, 04 Nov 2009 10:31:57 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23289436 http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23289436 Wed, 04 Nov 2009 10:18:08 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23289379 excellent point. I didn't think of nails from the roof could be in it.

davidg 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 :D ) It's a very valid point, though, and I'll triple check it before I do anything.]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23289379 Wed, 04 Nov 2009 10:09:51 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23289269 --
Lack of Preparation on YOUR Part does NOT Constitute an Emergency on Mine!]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23289269 Wed, 04 Nov 2009 09:47:32 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23288958
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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Striving for Parfection.]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23288958 Wed, 04 Nov 2009 08:40:29 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23288937 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]]> http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23288937 Wed, 04 Nov 2009 08:35:38 EDT http://www.dslreports.com/forum/Re-Old-roof-sheathing-problem-23288740
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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[att=1]

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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"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

]]> http://www.dslreports.com/forum/Old-roof-sheathing-problem-23288681 Wed, 04 Nov 2009 06:45:19 EDT