opening on non-loadbearing wall

[Bob1680]

Hello, Guys,
Does an 10ft opening on non-loadbearing ICF wall require a lintel with stirrup like a concrete beam or just a rebar ?
By the following Ontario building code, it seems just a rebar reinforcing. However, on ICF manufacture's manual, Lintel tables do not show that it is for loadbearing walls( See the Attachment.

9.20.17.3.  Openings in Non-Loadbearing
Flat Insulating Concrete Form Walls
(1) No openings shall occur within 1.2 m of interior and
exterior corners of exterior non-loadbearing flat insulating
concrete form walls.
(2) Portions of walls over openings in non-loadbearing
flat insulating concrete form walls shall have a minimum
depth of concrete of not less than 200 mm over the width of
the opening.
(3) Openings more than 600 mm but not more than 3 m
in width in non-loadbearing flat insulating concrete form
walls shall be reinforced at the top and bottom with one
10M bar.
(4) Openings more than 3 m in width in non-
loadbearing flat insulating concrete form walls shall be
reinforced on all four sides with two 10M bars.
(5) Reinforcing bars described in Sentences (3) and (4)
shall extend not less than 600 mm beyond the edges of the
opening.

Thanks,

 

[KootK]

What is your role in this ICF project Bob? Are you a practicing structural engineer?

 

[KootK]

Very good. Your original attachment didn't come through. Can you upload it again? Is this an exterior wall? How deep is your lintel? 8" wide?

 

[Bob1680]

Hi, KOOTK, my point is the ICF wall has 6" concrete core, and 15M@600mm rebar vert and horizontal already. Why does the non-loadbearing wall need a lintel with stirrup like the attachment?

 

[KootK]

Is this an exterior wall?

How deep is your lintel?

What is your floor/framing system?

 

[Bob1680]

Hi, KootK, IT IS an exterior wall. By the ontario building code in Canada, it seems there is no lintel, just 1 rebar over the top of opening.
9.20.17.3. Openings in Non-Loadbearing
Flat Insulating Concrete Form Walls
(1) No openings shall occur within 1.2 m of interior and
exterior corners of exterior non-loadbearing flat insulating
concrete form walls.
(2) Portions of walls over openings in non-loadbearing
flat insulating concrete form walls shall have a minimum
depth of concrete of not less than 200 mm over the width of
the opening.
(3) Openings more than 600 mm but not more than 3 m
in width in non-loadbearing flat insulating concrete form
walls shall be reinforced at the top and bottom with one
10M bar.
(4) Openings more than 3 m in width in non-
loadbearing flat insulating concrete form walls shall be
reinforced on all four sides with two 10M bars.
(5) Reinforcing bars described in Sentences (3) and (4)
shall extend not less than 600 mm beyond the edges of the
opening.

 

[TLHS]

For any non-Canadian readers, this is from Part 9 of our code, which is the prescriptive cookbook code portion used for small buildings.

I was going to say that it must be a minimum because otherwise point 4 seems worrying, because there must be an opening span where that stops working at some point.

I did some quick math, though, and if you're just taking the wall dead load, the span the one bar can carry is pretty long. I'd still personally have put a cap on clause 4, but it's not necessarily as terrifying as I had originally assumed.

 

[TLHS]

I'm assuming this is an infill wall or something if it's non-loadbearing?

 

[KootK]

A 10' exterior lintel will pick up some wind so the two bars each face seams reasonable. Stirrups would be ineffective for out of plane lad in a 6" wall.