ICF Tied Into My Chimney

 
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Old 10-23-2017, 04:12 PM   #1
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ICF Tied Into My Chimney


In the photo there is the start of a 9' wide back to back fireplace chimney. It will be rolled into the gable so it is fluesh with the gable end.

ICF guy wants to tie into my chimney as his foam forms wont be connected.

I thought I could do the chimney out of 8" block and do a couple different heights of bond beams with corner steel sticking out.

MY question is are 2 spots on each side with a 24" bar sticking out enough? And should I run some vertical steel as well?

Vertical steel doesnt do anything in a chimney unless it makes its way into the foundation, so I would have to run it up from where I am, Its grouted in the foundation I built.
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Old 10-23-2017, 05:00 PM   #2
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Re: ICF Tied Into My Chimney


I assume he wants it to stabilize as he pours? I don't see why he just doesn't brace off better. I don't see much bracing at all in the picture. Maybe Joasis can comment, I thought ICF was heavily braced normally.

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Old 10-23-2017, 05:04 PM   #3
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Re: ICF Tied Into My Chimney


The inside is braced well and it’s poured I think to the top in most locations, or there abouts
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Old 10-23-2017, 05:06 PM   #4
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Re: ICF Tied Into My Chimney


The roof trusses are made from white oak on site and each truss will weigh 3000 pounds from what they tell me. I’ll grab some pics of this guy hand making them on site. Pretty cool.
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Old 10-23-2017, 05:08 PM   #5
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Re: ICF Tied Into My Chimney


I'm just a redneck engineer but I'd say bond beam at header level would do the most good. I'm sure he's got horizontal steel at that point.
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Old 10-23-2017, 05:09 PM   #6
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Re: ICF Tied Into My Chimney


Quote:
Originally Posted by JBM View Post
The roof trusses are made from white oak on site and each truss will weigh 3000 pounds from what they tell me. Iíll grab some pics of this guy hand making them on site. Pretty cool.
I'd like to see it. I love all that stuff.
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Old 10-23-2017, 06:05 PM   #7
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Re: ICF Tied Into My Chimney


I donít have anything constructive to add since I have never worked on a ICF but hopefully you will update us as the job progresses!


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Old 10-23-2017, 06:46 PM   #8
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Re: ICF Tied Into My Chimney


Just wondering,how are you guys going to address the need / code requirements to maintain the 2" space combustibles need to be from fireplaces and chimneys ?
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Old 10-23-2017, 08:26 PM   #9
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Re: ICF Tied Into My Chimney


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Just wondering,how are you guys going to address the need / code requirements to maintain the 2" space combustibles need to be from fireplaces and chimneys ?
2" on interior fireplaces...1" on exterior, if memory serves me well.
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Old 10-23-2017, 08:32 PM   #10
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Re: ICF Tied Into My Chimney


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2" on interior fireplaces...1" on exterior, if memory serves me well.


Yup.Forgot the outer ones were 1/2 the inner.
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Old 10-23-2017, 09:14 PM   #11
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Re: ICF Tied Into My Chimney


Simply cut 2” of foam out if need be. It’s only one side, other side is a wood box. I might get the insp. To pass on it if I grout with a vermiculite mix in the cells along the foam.

Small potatoes
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Old 10-24-2017, 06:01 AM   #12
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Re: ICF Tied Into My Chimney


An Engineer would want a continuous angle iron (2 x 2" x 1/4"- 3/8")
bolted 5-6 times (3/8-1/2" sleeve anchor bolts) vertically on both jambs...

Or 2 Tapcons @ 8" c-c vertical fastening 16-20 gauge Galvanized 1" x 7" Corrugated wall ties
Or drill a 1/4" to 5/8" holes in the concrete about 4" deep @ every bed joint and hammer in a short piece of rebar of the correct size, epoxy coated for our anal friends if wanted..

If you are worried about differential settlement, you could saw in slots for the rebar instead of drilled holes.
Or use slotted wall straps with wire Vee anchors...
Trim a little foam off the poured wall and build a "pocket"(about 3/4" deep)( widen the Chimney work to 9'- 1.5" at the wall line) around the poured wall jamb, using some sort of bond breaker between the Block work and concrete.

After relooking the photo, I see the concrete isn't poured yet above ~4'. Drill some stub rebar into the hard crete, either leave a keyway if you build ahead of the cement mason, or drill in more bars as needed. IMO.

Last edited by Fouthgeneration; 10-24-2017 at 06:27 AM. Reason: more info,
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Old 10-24-2017, 08:12 AM   #13
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Re: ICF Tied Into My Chimney


If it was my job, I would set #4 bars out to tie your work as high as the ICF goes, and that is it. Probably 3 levels. Diagonal from the wall into the opening where your blocks will be, and set as close as exact to your block courses for a solid wall connection.

I have done several where the fireplace was blocked out in the wall, and the chimney built as usual, and I always stubbed out rebar pins for tying the chimney to the wall, but....we always brick or stone the exteriors, so it wraps the chimney anyway.
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Old 10-24-2017, 12:39 PM   #14
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Re: ICF Tied Into My Chimney


Quote:
Originally Posted by superseal View Post
2" on interior fireplaces...1" on exterior, if memory serves me well.
I believe it's 2" except for between chimney and exterior sheathing when chimney runs up the wall exterior to the house then it's 1". Also 3" from back of fireplace to combustibles.

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