Steel Joists

[Raywesebaum]

Can you drill through a steel joist for plumbing?

 

[Msradell]

Any steel joist I've ever seen already have a lot of open spaces, why would you need to drill through 1?

 

[Raywesebaum]

Any steel joist I've ever seen already have a lot of open spaces, why would you need to drill through 1?

It is an existing building that has 8" of spray insulation so if there are holes already no way to see them.

 

[patrickjames]

Floor , wall , or roof framing members? Residential or commercial?

 

[Raywesebaum]

Floor , wall , or roof framing members? Residential or commercial?

Roof and commercial

 

[patrickjames]

It kind of all depends , I would ask for a letter from someone smarter than me. The E word comes to mind.
2018 IBC Section 2207 Steel Joists

2207.1 General
2207.2 Design

The registered design professional shall indicate on the construction documents the steel joist and steel joist girder designations from the specifications listed in Section 2207.1; and shall indicate the requirements for joist and joist girder design, layout, end supports, anchorage, bridging design that differs from the SJI specifications listed in Section 2207.1, bridging termination connections and bearing connection design to resist uplift and lateral loads. These documents shall indicate special requirements as follows:

1. 
   Special loads including:
   1. 1.1. Concentrated loads.
   2. 1.2. Nonuniform loads.
   3. 1.3. Net uplift loads.
   4. 1.4. Axial loads.
   5. 1.5. End moments.
   6. 1.6. Connection forces.
2. 
   Special considerations including:
   1. 2.1. Profiles for joist and joist girder configurations that differ from those defined by the SJI specifications listed in Section 2207.1.
   2. 2.2. Oversized or other nonstandard web openings.
   3. 2.3. Extended ends.
3. Live and total load deflection criteria for joists and joist girder configurations that differ from those defined by the SJI specifications listed in Section 2207.1.

The design, manufacture and use of open-web steel joists and joist girders shall be in accordance with either SJI 200 or SJI 100, as applicable.
IBC 2018 Section 2211 Cold-Formed Steel Light-Frame Construction

2211.1 Structural Framing


For cold-formed steel light-frame construction, the design and installation of the following structural framing systems, including their members and connections, shall be in accordance with AISI S240, and Sections 2211.1.1 through 2211.1.3, as applicable:

1. Floor and roof systems.
2. Structural walls.
3. Shear walls, strap-braced walls and diaphragms that resist in-plane lateral loads.
4. Trusses.

 

[steveray]

Define joists?...For CFMF the AISI docs will have info, for PEMB, buried in the manufacturers info somewhere....But you can do whatever your engineer will sign off on basically...

 

[e hilton]

I think he is confusing bar joists with i-beams.

 

[Raywesebaum]

Thank you everyone.

 

[Paul Sweet]

You can't drill though an open web steel joist. You could try poking through the insulation, if it's thermal insulation and not spray-applied fireproofing, to locate openings between web members.

If it's a light gauge steel joist the manufacturer or AISI standard should have a table or diagram with allowable hole sizes and locations.