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Old 11-24-2013, 12:34 PM   #1
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A tiny sag noticed on roof


Bought a house a few months ago. When I was on roof this week for gutters, noticed a 2 small depressions on roof surface. When I went in attic to investigate, I saw this:







What am I looking at here? Is this something to be dealt with immediately, or can it wait until spring (if attention is needed, of course)? Is this something I can repair on the inside by adding some piece of wood to brace?

If this can be done by a diy-er, and needs to be done now, can you please explain in a little detail to someone who can figure out, but needs a clear picture?

I have been leaning on you guys for a lot of knowledge since buying this house. I really appreciate all you do!

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Old 11-24-2013, 12:43 PM   #2
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A tiny sag noticed on roof


Someone that installed that roof was sleeping or missed class the day they talked about installing H clips between the trusses or rafters.
http://tecotested.com/techtips/tt_edgeclips
To late now, now your going to have to add blocking from below to support it.
Just measure the distance between the rafters and cut a 2 X 4 that length. Tap it in place and toe nail it to the rafter.

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Old 11-24-2013, 04:29 PM   #3
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A tiny sag noticed on roof


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Someone that installed that roof was sleeping or missed class the day they talked about installing H clips between the trusses or rafters.
http://tecotested.com/techtips/tt_edgeclips
To late now, now your going to have to add blocking from below to support it.
Just measure the distance between the rafters and cut a 2 X 4 that length. Tap it in place and toe nail it to the rafter.
Joe's got it, wait till it warms up to reduce the chance of cracking the shingles.
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Old 11-24-2013, 05:14 PM   #4
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A tiny sag noticed on roof


2x4 rafters 24" OC? Really?

Hard to tell from the pics....but that almost looks like 3/8" plywood
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Old 11-24-2013, 05:21 PM   #5
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A tiny sag noticed on roof


Hardly think lifting the shingles a 1/2" is going to do any harm.
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Old 11-24-2013, 05:35 PM   #6
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A tiny sag noticed on roof


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2x4 rafters 24" OC? Really?

Hard to tell from the pics....but that almost looks like 3/8" plywood
House is 40 years old. Here is another pic of the attic:

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Old 11-24-2013, 05:43 PM   #7
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A tiny sag noticed on roof


Are those plumbing vents sticking up?
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Old 11-24-2013, 05:58 PM   #8
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A tiny sag noticed on roof


looks more like the vent pipe from the bathroom fans.
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Old 11-25-2013, 02:30 AM   #9
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A tiny sag noticed on roof


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Hardly think lifting the shingles a 1/2" is going to do any harm.
No idea where the guy is, could be stupid cold. No harm in leaving it til spring. Those possible bath and kitchen vents dumping in the attic are a bigger issue.

Last edited by roofermann; 11-25-2013 at 07:29 AM. Reason: spelling
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Old 11-25-2013, 03:46 AM   #10
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A tiny sag noticed on roof


When its time for a new roof. The whole roof is probably going to need new sheathing. Seeing how its 24 oc it has to be thick which isn't cheap. Stay off the roof. Do like joe said. Finally if those are exhaust vents from bathroom. Sure hope your not in a cold weather climate. The moisture from those vents could freeze on the sheathing.
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Old 11-29-2013, 12:23 PM   #11
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A tiny sag noticed on roof


Yeah, those are fan vents from bathroom. Talked about it in another post. Was going to run a flexible duct to current vent in roof, but was suggested I put new hole in roof over both fans with a new vent to outside. Waiting until spring.

Unfortunately, I am in cold area - suburbs of Chicago.

Last edited by kah5683; 11-29-2013 at 12:41 PM.
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Old 11-29-2013, 02:31 PM   #12
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A tiny sag noticed on roof


24" on center is common, but there should have been thicker sheathing and H clips in a snow area.
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Old 11-30-2013, 02:00 PM   #13
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A tiny sag noticed on roof


Take another picture of an ink stamp on one sheet for us, please. The plywood used may be code-approved for the application. H-clips may/not be required, depends on the rating given on the stamp; http://www.strongtie.com/products/co...pscl-psca.asp#

Code is similar; http://publicecodes.cyberregs.com/ic...?bu2=undefined

Center support on 24" is always good even on rated for the span applications. IMO, the one edge went opposite the other due to expansion from humidity and was not gaped 1/8" at edges at application. The fasteners hold the sheet stationary, the edges can't move toward each other so they move in elevation. If the sheathing is tight- no gaps- during the summer, the blocking may only even the two edges temporarily until humidity (seasons) changes again. Solution is to remove material from one sheet for a proper/required gap. (OR) The extra moisture from the fans is causing the buckling, fix that ASAP and the sheathing may shrink down flush alone (don't add a block until ply is dry). Next comes mildew (mold) after the ventilation can't keep up with moisture you are forcing against the wood sheathing. The 1/2" three-ply plywood looks similar to yours, though we can sit here and guess all day....... need a pic.

Gary

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