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Newberg, OR
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Columbus, Mississippi
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 Gaps between rafter and ridge board/ beam
[#2] Posted: 06/26/2007 - 1:50:58 PM |  |  |
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I ran into that same thing a couple of weeks ago, with gaps ranging from 1/8 - 3/4 of an inch (of those that had gaps; not all did). I recommended fixing everything 1/4 inch and up by sistering on pieces at least 2 - 3 feet long (well secured), and ignoring the rest. I don't have a standard for that, just my experience in carpentry.
Once you get everything up and decked it's unlikely anything bad is ever going to happen, but come on; anything over 1/4 inch is a pretty good miss. I believe the builder's association has standards for that kind of thing, but they stink. 
The first contractor they called wanted to tear the whole roof off and do it over. Get real. It ain't THAT bad.
Brian G.
That's A Bad Scratch....We'll Have to Take the Arm Off at the Shoulder 
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Rochester, New York
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Gaston, Oregon
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Gaps between rafter and ridge board/ beam
[#4] Posted: 06/26/2007 - 9:56:09 PM | | |
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Quote: Originally posted by Chad FabryQuote: The house I inspected today was framed in the winter (corrosion on attic framing nails and stains on sheathing), and it appears that the rafters likely shrunk away from the ridge board once dry. Just so you now... lumber shrinks almost imperceptibly along its length. The directional instability is across the trunk of the tree not along the trunk. Sloppy framing is the problem. Wood's affinity to absorb and release moisture and Mother Nature have nothing to do with the condition.
What I typically see is that, as the rafter shrinks, the pointy end of the plumb cut remains in contact with the ridge board but the bottom end moves away from the ridge board. The shrinkage across the width of the rafter effectively causes the plumb cut to become more acute.
- Jim Katen, Oregon
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Jim Katen, Oregon
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Newberg, OR
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Gaps between rafter and ridge board/ beam
[#5] Posted: 06/26/2007 - 10:03:29 PM | | |
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Brian,
I am glad I am not the only one making this call-- I'm still hoping to find documentation somewhere to back it up.
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Columbus, Mississippi
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Gaps between rafter and ridge board/ beam
[#6] Posted: 06/26/2007 - 10:08:45 PM | | |
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I think they must've had a cross-eyed guy on the crew the day they did the one I looked at. This wasn't shrinkage, the gaps were even up and down the plumb cut. Somebody just kept missing the measurement every other rafter or so, which they decided to hide at the ridge. Pitiful. 
Brian G.
Job Security Forever 
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Newberg, OR
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Gaston, Oregon
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Columbus, Mississippi
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Gaps between rafter and ridge board/ beam
[#9] Posted: 06/27/2007 - 08:37:35 AM | | |
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Originally posted by Jim Katen
How about 802.6. The ends of each rafter or ceiling joist shall have not less than 1-1/2 inches of bearing on wood or metal and not less than 3 inches on masonry or concrete.
That's not bad. The ones I saw had zero bearing.
Brandon, I don't have time to dig around right now, but I'll bet if you could find some spec & tech stuff from nail manufacturers they make it clear their nails aren't designed to bear loads across big gaps between framing members. An email to one of those engineering departments might get you something.
Nobody argued with me when I called for repairs. I'd have trouble hiding my irritation if some jerk called me up to insist that 3/4 inch gaps in framing was fine. I see little misses all the time and I don't say anything, but jeez...learn to read a frickin' tape.
Brian G.
Okay Bob, Make It 188 and 7 of Those Little Marks
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Kenmore, WA
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Gaps between rafter and ridge board/ beam
[#10] Posted: 06/27/2007 - 09:43:35 AM | | |
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I've never looked myself but read a lot about the standards put out by N.A.H.B.- National Association of Home Builders.
Maybe their standards are online for free?
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Randy Navarro
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Newberg, OR
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Gaps between rafter and ridge board/ beam
[#11] Posted: 06/27/2007 - 3:23:11 PM | | |
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Brian and Jim.
I will use the code referenced and also contact a nail manufacturer for a back up as well.
Brian-- they left your framing gap in that pic on purpose to allow for proper airflow at the ridge vent
Randy- thanks for the reference on the NAHB. I have their book and tried that prior to posting-- no such luck.
Thanks everyone.
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Georgetown, KY
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Lexington, KY
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Gaps between rafter and ridge board/ beam
[#13] Posted: 06/29/2007 - 5:35:11 PM | | |
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Our state code requires roof framing to comply with the standards of the AFPA. When I catch flak from a builder, I have him check out their framing guide. There's a diagram and language that says the rafter end has to rest flush against the ridge board to avoid horizontal shear in the rafter.
If Mike will tell me how to zap a .pdf of the guide to him, he can post it in the library.
John
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Kenmore, WA
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Gaps between rafter and ridge board/ beam
[#14] Posted: 06/29/2007 - 6:17:09 PM | | |
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That's easy,
Send it as an attachment to hausdok@inspectorsjournal.com ; or, if it's reachable through a url, just add it to the library yourself by posting the URL into the file directory under the appropriate category.
ONE TEAM - ONE FIGHT!!!
Mike
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Taunton, MA
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Gaps between rafter and ridge board/ beam
[#15] Posted: 07/03/2007 - 05:36:44 AM | | |
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Erby,
What would you report about the splice in the ridge board? It may be acting as a mechanical connection between the opposing rafters, but it will also be transferring some load to it's endbearing - right?. Not to mention the less than ideal placement of the splice.
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