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Old 02-08-2010, 12:57 PM   #1
ren
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ridge sag in 100+ year old home


I own a 100+ year old home that is in very good condition overall but has a sagging ridge. Though this is the case the walls do not seem to have moved out, nor do the rafters seem to have spread. The ridge sag is in the middle and appears to be due to the house having settled over the past 100 years. The sag is visible from the street and I would like to correct it, but am not sure how. The roof was newly shingled with cedar about 5 years ago.

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Old 02-08-2010, 01:09 PM   #2
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ridge sag in 100+ year old home


Roof sag is because of a variety of things that have been thrown off balance with settling and sagging over the years.
1/2" here, 3/4" there - a bow here, a warp there. . . and it's never simple to fix - every stud in every wall has something to do with it.

I wouldn't worry about *the* sag that's visible - you can't jack up the roof and slide in new beams, you know. If you're planning on a variety of DIY projects then, as you're doing them, that's a good time to examine studs and beams and fix ones that have cracked, etc.

But if you're roof is sagging and you're not planning on any other improvements there's really nothing that can be done without costing an arm and a leg - and another leg. Sure, it's possible - but it's not a DIY effort, honestly.

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Last edited by Snav; 02-08-2010 at 02:02 PM.
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Old 02-08-2010, 09:36 PM   #3
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ridge sag in 100+ year old home


agree... not a good DIY project.

The time to address these issues was 5 years ago, just before the new shingles.

100+ years... hmmm

Do you have a ridge board? Is it a 1x 8?

do you have collar ties? every four feet?

Full cut 2x? rafters? 16" oc? How long is the rafter span?

any knee walls?

Let us know!

Very common problem / Some of the oldtimers thought ridge boards and collar ties.. was a bunch of silly over kill... The two opposite rafters toe- nailed together will be just fine.
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Old 02-09-2010, 01:46 AM   #4
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ridge sag in 100+ year old home


do you have access to the main support system in the basement?

check the main beam that is oriented to carry the centre weight of the roof to see how level/straight it is.
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Old 02-09-2010, 08:15 PM   #5
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ridge sag in 100+ year old home


Ren,
If I were a hundred years old, I would have a sag in my ridge too. That's called character.
Mike Hawkins
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