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Old 12-20-2006, 01:47 AM   #1
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My 1918 home has 2x4 rafters which appear to be sagging. This is happening only on the east side of the home (house faces North) which I would assume would be due to snow taking longer to melt on that side. West side of the roof looks good. I'm wondering if it would be acceptable to simply add a 2x4 spaning rafter to rafter in the attic, kind of like a celing joist midway between the peak and current celing joists. What would be an acceptable way to fix this?

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Mdog

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Old 12-20-2006, 02:30 PM   #2
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Mdog,

2x4's make fine rafters but they require internal bracing. See pages 7, 8, and 11 of the following document:

http://www.acrooftrusses.co.uk/downl...Technology.pdf

...Christopher

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Old 12-21-2006, 01:34 PM   #3
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Adding diagonal bracing is an OK idea as long as you transfer the load to, preferably, an interior wall or bearing wall (of top plate in attic). The deflection of the roof will be transfered to wherever you brace to.

Check with your local Building Dept for code requirements. This is a pretty simple project once you know your limitations
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Old 12-21-2006, 06:15 PM   #4
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How many layers of roofing do you have?

Your roof structure may be marginal and any extra load could be the cause.
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Old 12-24-2006, 08:27 AM   #5
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Thank-You all for the reply's and help. I do have a load bearing wall, unfortunally it's on the west side (sagging part on the east). Judging by the rooftruss.pdf file it appears bracing usally connects directly below the side of the roof that it's supporting. Darcarcr mentioned diagonal bracing would be OK to use, but just to be sure we are on the same page this would end up looking like this " \ " in the attic, correct? I do have another wall under the roof in question, however the only additional bracing in the basement is the doubled up 2x8's. Would this be considered a load bearing wall? That section of the attic also has live "nob and tube" wiring I'd like to try and miss. One last question, should/can the roof be straightened out b/4 bracing? I will of coarse check with local codes once I have a game plan going.

concretemasonary, I do not know for sure how many layers I have, however the house was reshingled approx. 5yr ago and I do believe the old layers were removed.
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Old 12-24-2006, 12:39 PM   #6
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Mdog,
Quote:
That section of the attic also has live "nob and tube" wiring I'd like to try and miss.
Yes, you definitely do not want to disturb the old wiring. The issue with the wiring is the insulation which has dried out decades ago, and become somewhat brittle. Put replacing the old wiring on your to-do list. If it looks good with a bright flashlight then it is probably ok, but once again, don't touch it as it may fall apart.

As for the rafters, improving rafters in-place is a bit tricky. Load transfer is one of a few issues. I gather that you would have to apply a jack within the rafter to measure and set the length of any brace. Also, since it has been sagging for so long, it is unlikely that you will be able to completely remove the sag. This is not an area that I specialize in so get more educated opinions.

...Christopher

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