Roof Truss And Overhangs

WNYcarpenter

We've started setting trusses on a 2nd floor porch roof that ties into the main roof. The main roof pitch is 11/12 that hips into a 6/12 over the porch on the gable end.

We have instructions from our truss company but there aren't any decent reference points on the drawings to locate the hip. The hip truss is pre-manufactured and is drawn to be offset from the corner of our beam (around 15") which it sets. I would assume the tail of the hip truss, even being offset for the change of pitch, would fall in the corner of the sub-facia.

Our approach has evolved into setting our common trusses and running our sub-facia in both directions until we're square and level, then setting the hip so it works...

The plumb cuts on all the trusses are 15 1/4" (11/12, and 6/12) from the side wall/beam. As far as I can tell, the sub-facia on the 6/12 @15 1/4" does not match the sub-facia on the 11/12 @15 1/4".

Is it possible to match sub-facias keeping the same soffit widths?

barreled

I have had that problem a couple time In remodels, I did not get them to match but I hope someone has a good answer for you cause I wanna see it.

slowsol

No.

I am slightly confused by the rest of your post.

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-John

We'll have to grab a longer board. I forgot to put the wood stretcher in the truck today.

RobertCDF

Not quite sure if I am picturing it right... But we always cut our tails to meet for our soffits and fascia... Hips almost always had more cut off it.

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Robert Shaw
Colorado Springs Custom Decks
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72chevy4x4

would setting an additional plate under the section raise enough to make the fascia's the same?

WNYcarpenter

I wish I could describe the situation more acurately.

The house we're building is 2 1/2 stories. The main roof system sits on the second floor wall plates. On the gable end there's a 3rd floor porch. On either side of the porch there is a hipped roof. The main section is 11/12, which turns the corner changes to a 6/12 and 90's into the 3rd floor porch.


I'm most certain I'm right...can you have a 6 pitch overhang meet an 11 pitch overhang level and keep the depth of your soffit the same......No....

The question is, how do you alter your trusses to do so? Shim the tops, cut back the tails???

Honestly, I don't see what the big deal is....we have a designer and his whole detail is based on the soffit detail, that's what's causing the controversy. If there is a way, I'd like to know so I can be the big hero

KentWhitten

From what you're describing...no. Sounds like a bastard hip you're describing. Do the bottom chords create your soffit, or do the top chords run over and you have to make your own soffit?

If the bottom chord is flat for your soffit, sounds like your truss designer may have screwed up big time. He should know better. If it was drawn that way on the plans, some people should have gotten together and said "hey we got a problem here"

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WNYcarpenter

It would come close, but the bottom chord is the ceiling joist for the 2nd flr porch.

Some more info....the facia detail on either end of this porch continues uninterupted across the entire gable end including the floor joists of the 3rd flr porch.

Pavola

Yes, its definately possible. The 11/12 heel heigth will higher than the 6/12. If you're shooting for a 12" OH, then the 11/12 heel heigth will be 5" taller than the 6/12. The hip rafter will bear on the 11/12 side of the outside corner with heel heigth matching the 11/12 trusses. Measure or check the truss spec. sheet for those trusses and if they're the same, the truss co. screwed up. You wouldn't beable to make it right unless you added plates under the 11/12 trusses. Otherwise you're left with creating a wall against the 11/12 gable truss with a shorter hip rafter.

Pavola

Wanted to add that you could scrap the 6/12 trusses and make your own rafters with the correct heel heigth, but that depends on if the 11/12 heel is high enough so you'll still have a tail on the rafters. Perhaps you could post the heel heigths of both trusses and the desired OH size.

constructionldr

I agree...if its possible to scrap the trusses...build ur own, over run ur finished facia and cut back in the end to match. Just a thought

A W Smith

Payola is correct. You will not match both soffit width and facia hight on two different pitches. You would need to plate up or pony wall under the low pitch trusses. But them if the truss manufacturer screwed up the ridge end of the lower pitch trusses will not intersect the top of the offset hip. Will need more information.


This mornings edit to yesterdays post:
My mistake, You have to plate up or pony wall under the HIGHER pitch trusses to match the facia and soffit. Sorry for the confusion.

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Al Smith
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WNYcarpenter

Thanks to all,

we scrapped the trusses and built it ourselves. This was my 1st experience with that hip. As I learned, the hip offset to the 11/12 side and we cut back the 6/12 tails to make our facias plane out...We ended with using constant 35* and 55* plumb, seat, and miter cuts. Was I close??

I'm not familiar with "pony walls" but after stick framing we did need to build a knee wall under the stick framing to match the trusses....

unfortunately I don't do this enough to be proficient, roof framing is fun!!

A W Smith

Ive always called them Knee walls but a lot of people I meet call them Pony walls,. Same thing.

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Al Smith
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Pavola

Sounds like the truss co. messed up the 6/12 trusses??
Explain the 35* and 55* some more. They aren't the plumb or seat cut angle for either 6/12 or 11/12.