CFS Material Spec 5

[dik]

What is the most common ASTM or CSA spec for CFS structural framing member steel and what are the strengths for the various grades, if it has these?

Thanks, Dik

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[jayrod12]

Dik,

I believe in Canada it's CSA S136-16 with a 2019 supplement. Regarding grades, I was always under the impression that Fy=240 MPa was fairly common and in necessary instances they could source Fy=350 MPa material however it was always classified as special order.

 

[dik]

Thanks, Jay... I thought it was S136, but wasn't sure. Trying to find it on the web, I encountered many ASTM specs, but couldn't find the 'correct' one. I also include the CSSBI references.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[milkshakelake]

You got the Canadian answer, this is the USA east coast one.

12, 14, 16 gage: ASTM A653 Grade D, fy=50 ksi
18, 20 gage: ASTM A653 Grade A, fy=36 ksi

Some companies also use Grade A 36 ksi for 16 gage. 50 ksi is not a special order here.

 

[dik]

Thanks for the US reference... I'll add it to my list of specs. For load bearing items, Grade 50 is recommended, even up here.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[jayrod12]

I'd expect that the actual material we get up here in the cold white north is the exact same as you are getting, they're just too cheap to pay for the full double certification. Although I may be out to lunch on that as well. I don't do enough CFS design to know for sure, and when I do some I figure out a way to make it work without going to thicker than 18 ga. It may be that our contractors don't use thicker than 18 Ga regularly and therefore call everything special order beyond what they're used to.

 

[Brad805]

Bailey Steel Stud
Bailey Structural Framing

 

[skeletron]

Yep. MSL has it. 50ksi for the heavier gauge.
CSA S136 is basically a copy of AISI100.

 

[Aesur]

On the US West Coast we typically see ASTM1003 Grade 33 Type H for 33 and 43 mil and ASTM1003 Grade 50, Type H for 54 mil and thicker.

 

[dik]

ASTM A1003 seems to be more specific to CFS than A653; is there a preference? Grade 33, type H for < 54mil and Grade 50 for >= 54mil (still type H)? Found this:

https://cfsei.memberclicks.net/assets/docs/technotes/tn-g800-12.pdf

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[Aesur]

This document talks about the differences in A653 and A1003.

[URL unfurl="true"]https://cfsei.memberclicks.net/assets/docs/technotes/tn-g801-13.pdf[/url]

 

[dik]

Thanks Aesur...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik