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Tool Talk Discussion Forum

OT: Help with Ridgeboard

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Slowpoke

10-22-2006 00:44:08

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I need to frame a 36' long roof with a 2x6 ridgeboard. The rafters are 2x4s on 24" centers. How and where is the right place to butt two 2x6s to make the 36'? Is it between two opposing rafters with toenailing or somewhere between the 24" spacing of the rafters using a plywood plate on either side of the 2x6s? Or some other way?
Thanks for your help.

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David - OR

10-22-2006 08:09:20

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Re: OT: Help with Ridgeboard in reply to Slowpoke, 10-22-2006 00:44:08

For an ordinary rafter and joist gable roof, the ridge board serves only as a thrust plate between opposing rafters. It has no load carrying requirement. So you can splice it anywhere you like -- personally, I'd join two sections with a plywood scab half-way between two sets of opposing rafters.

Structurally, this is better than trying to make the ridge board "break" right at a rafter pair. Having a joint right in between the two opposing rafters partially defeats the ridge board's thrust plate function.

From an ease-of-building point of view, sometimes the ridge board is used as a temporary support for rafters, until you get the opposing rafter and the ceiling joist in place. In this case, give consideration to whatever makes it easiest to support and brace the ridge board. Here again, halfway between two pairs probably works well.

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Ken Crisman

10-22-2006 00:49:32

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Re: OT: Help with Ridgeboard in reply to Slowpoke, 10-22-2006 00:44:08

To start with you screwed up using 2 ft centers on a roof . I did that & now have alot of wash board effects between centers . But since you already did ; to avoid wasteing the 2x6 material , I'd butt ends & scab 3/4 material on the backside .God bless, Ken

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Slowpoke

10-22-2006 01:38:53

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Re: OT: Help with Ridgeboard in reply to Ken Crisman, 10-22-2006 00:49:32

Thanks Ken, I may have screwed up the whole project because I removed a bad T&G shed roof that spans 16' with 2x8s plus a 4' overhang on the front. They are on 24" centers. So I turned them into the bottom chord of a truss with a 3/12 slope. That's why the new rafters are on 24" centers. I'll be using 1/2 plywood decking. The 2x8s sag so much in the center that the original slope of 3/8" per foot would no longer drain. That's 7-8 inches over the 20' span.... My home has 2x4 rafters with 1x8 boards since 1962 with no washboard effect.

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steve from mo - dangit!

10-22-2006 08:18:08

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What else is happening? in reply to Slowpoke, 10-22-2006 01:38:53

The ridgeboard is not the problem, since it only holds the raters apart and provides temporary support while you're putting up rafters. It can't hold the whole roof straight.

If you have a sag in the middle of the roof as compared to the ends, you also have a bulge (or less likely a sag) in one or both of the side walls. A chalk line will help you locate it. Then when you get the walls pulled in straight, and anchor the walls to the rafters properly, you will have a straight roofline.

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