Triple Hip?

dave owens

I have a hip roof with hips of 18 feet in length and at a 3 pitch. The structural engineer is insisting these need to triple 2x12. This seems excessive to me what do you guys out there think. Unfortunately its already built with double 2x12 hips.

genecarp

3 pitch, 18 ft, the engineer might be on to something, cutting back a sliding another in, major pita. You will lose your corner lines on the soffet. steel flitch plate, 1/4'', maybe, Joe Carola, where are you?

Whats the int detail? any way to reduce the 18ft run with support. header up cieling joist, knee wall in attic?

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curapa

18' hip with a 3 pitch definitely needs some beefing up. I would not want to go with a triple but rather find a way to support it from underneath. If there was nothing to install supports on I would insert a beam or two if needed.

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KentWhitten

depends on some load factors also. if it's an open room underneath, then I would almost say 3-2x12's aren't enough. If there's ways to post in the middle, I'd do that as a supplement. 3/12 pitch is almost like a floor. The opposing hip jacks aren't going to do much.

You put that up there just the way they say, then jump on that sucker and if it bounces or flexes, I'd still beef it up more. It should be rock solid.

Engineer is going to CHA

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joasis

Depending on the loads, isn't this where a microlam would be a plus? The 3 on pitch is the interesting factor, but I can't imagine on the triple out....must be one massive load.

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Cole

We need some more details man, to even begin to help you with an answer or suggestions.

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HallisseyDesign

I would love to see pics of this! Sounds like a PITA! Pics pls

FRAMERBEN

transfer , transfer, transfer........

Joe Carola

Why was it built with 2-2x12 hips first and now the Engineer is changing it? Engineer realize he screwed up, or did you not follow the plans?

Are there ceiling joists underneath, or is it cathedral ceiling?

Is it sheathed?

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Joe Carola

dave owens

Its not a cathedral ceiling. Its an addition, the rafters run to a ledger on the existing house as do the 2x8 collar ties/ceiling joists. The hip is irregular so there is a 5 pitch on the minor side. All common and jack rafters have hurricane clips and the addition is in massachusetts.

KentWhitten

You still need to address why there is a dbl now and not a triple. Is it a decision you made? If it is, then you're SOOL. If the engineer changed his mind after the fact, then it's on his tab and you need to make sure you get paid for it since it will be an extra.

We're not going to be able to give you any specific structural advice since no one here is an engineer, but certainly 18' is a big distance.

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Joe Carola

Why was it built with 2-2x12 hips first and now the Engineer is changing it? Engineer realize he screwed up, or did you not follow the plans?

Is it sheathed?

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Joe Carola

Gold Tie

Its attached to an existing house and no where to brace or install a beam?

Do you know how to weld? If you can you can make a c-channel that would hold the world up. Hell, just 1/4" flat stock bolted to the bastard would be easier than sliding a new 2x12 in!!

Ask about different options.

KentWhitten

The problem with that advice is that you STILL would need the engineers OK to do that. You just can't go working blindly around and assume that it's OK to do that. It may just well be fine and dandy, but unless you are an engineer, the job is to put things in the way the print says to.

Joe's question is still standing. Who made the mistake?

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If you correct your mind, the rest of your life will fall into place ~Lao Tzu

Custom Cabinetry - Portland, Cape Elizabeth, Scarborough, Kennebunkport, Yarmouth, Falmouth, Cumberland, Ogunquit, Maine

Salmon Falls Cabinetry

Gold Tie

Your right... That's why I said ASK about alternative options.

I think he already passed the bridge on who's at fault... It sounds like he is on the, "how do I fix it now" bridge!!

borat_borat1950

A 3/8 or1/2 x10, or even an 8" would send the pressure to the plate as long as you have the footing there? Called a flitch plate , very useful when you do something like this!

borat_borat1950

Sorry duke, but what you get out of the people here are bar napkins, and you have to build it for them, Cheap is good , but not to standards.So how long does it tatke to know the rules?

borat_borat1950

who is joe, and yes i am.3/8 flitch will put 70,000 pounds to th plate

borat_borat1950

Love your qoute! Agree or disagree, if we built it by the print it would fall down, almost always?