What do you want to hang? It sounds like you need to talk to an engineer.

A garage storage rack

Truss or an engineered I beam floor joist? How much weight? If more than a few pounds will be stored on it I would not as they are not engineered for "pulling" forces.

Put your baby elephant elsewhere.

I don't know if I'd hang a car engine for any length of time, but for anything less you probably don't need the opinion of an engineer.

Who wants to hang an engineer from a floor truss?!?!?

I have on occasion. Along with an architect or two. lol

Pictures please.

Here is an example. This is not my house and I would have doubled the rim. Still the example uses steel frame to hang some light weight.

The ceiling above frame with 11 7/8" but no livable space. The back is attached to the garage door header. Left side is hangs on the support wall. The right side is suspended. If you place like 300# [excessive], it is distributed as 150# to the garage header [back], 150# front. Split load is about 75# or 32# per I joist (2x). With no livable space above.... and with the oversized Ijoists, it is fine.

Was this before the truss collapse?

it's a joke'

While I wouldn't have any problem hanging that kind of weight from the structure, it helps to know what kind of joist you are attaching to. Many of the lighter I-joists don't give you much more than a 2x2 for a bottom member. Here is link to the Weyerhauser tech sheet for what you are planning to do. https://www.weyerhaeuser.com/application/files/5315/2952/6247/TB-808.pdf

We still don't even know for sure what the system is, trusses or I Joists............................

Without knowing your floor system, and what are you trying to achieve it will be hard to say. Looks like You have 16" (or 12" [11 7/8]) I joists supported by 3.5" beam supporting distributed load on both sides... I would not hang anything substantial on that beam... When in doubt $400 engineer opinion worth it's price...

You could hang just about anything you want from the side of the big girder with LedgerLok screws.

If you spread out the loading and were careful with the attachments, you might be able to hang from the bottom of the I-Joists but you should get some help with that.

Keep your car insurance up to date.

Hilarious

Not quite. It wouldn't void the entire house warranty; just the one year warranty for the structure and the much longer Weyerhaeuser warranty for delamination or manufacturing defects. Of all the possible dangers of home ownership, I find the failure of joists and beams to be far less likely than damage from fire, electrical wiring and falls for which most people take only minimal precautions.

The trick is to reduce the added load on the structure, especially on the I-Joists. I would put the rack against the center of the back wall of the garage resting on a horizontal cleat lag bolted to the back wall. I would hang the middle of the front of the rack from the sides of the main girder, then add some hangers at the front corners from the I-Joists. The connection points at the I-Joists should have full-height vertical web blocking and the hanger should be attached to the blocking and the top chord but not the bottom chord. A competent contractor should be able to install the rack so the additional loads are so small they would not increase the risk of structural failure. If you can't find a competent contractor, hire an engineer and build it yourself.

Don't conflate warranties with good design. One protects from a failure, the other reimburses you after a failure.

Very Helpful. Thank you so much RES 3d Sketches

If an I-Joist is going to deteriorate due to a manufacturing defect, its unlikely to occur within the one year builder's warranty period. That warranty would essentially only protect you for an installation that didn't comply with the engineer's design or the manufacturer's installation instructions and the warranty would only be voided for the joists to which you attached hangers. Voiding the warranty should be of no concern for this simple common garage modification. The sky is not going to fall.

RES, glad you are assuming the responsibility for the performance of the framing after the home owner installs who knows what in who knows how on the garage ceiling.

Let us know how it goes.

"Let us know how it goes."

Before it makes the news.

just talked with superintendent which is why we are going with shelving, as it would void 10 year structural warranty ~ Thanks for most everyone's input.✌

I have been designing, selling and installing over garage racks for 15 year. We manufacturer a wall mounted 4x8 rack. One side is supported by the wall studs with slotted beams. So half the load is not on the ceiling. The front side has 3 legs and each leg has a ceiling bracket that spans two of the pre fab I-joists. So if you put 600 lbs on the rack, that’s just 100 lbs per leg spread over 2 joists.... so it ends up 50 lbs per joist. That’s nothing! We have never had a single problem with ANY installation ever.

No, I wouldn’t install 2 - 4x8 racks in the CENTER of the garage. That would put too much load in the center of the room. And every homeowner insurance guy or superintendent

will say the racks are unsafe, basic CYA. And by the way, every garage with pre-fab I-joist have garage doors hung from them, and some wood door are hundreds of lbs. So how does hanging something from the ceiling void the warrant? that just doesn’t make sense to me.

But everyone needs to make the decision on their own. Im just say I have never had a single complaint from anyone about their structure years later. And company wide, through our independent dealers, we have installed over 50,000 racks since 2005.

SuperShelfStorage.com

Can I hang a heavy bag (punching bag, ~ 100 lbs with the chain) from the engineerd I - joists in the basement? I could be totally off base but how about a couple of 2x4s screwed across 2 or 3 I joists to share the load? The length of the I joists are about 17'.

No problem. And no engineer opinion needed.

S Pal, Weyerhauser has a document specifically discussing punching bags attached to engineered wood joists. You need to remember there are intense lateral and vertical dynamic loads from the movement of the bag, it's not just about the static weight. You will need to block between joists and along the web of the joist for extra stability.

https://www.weyerhaeuser.com/blog/supporting-exercise-equipment-with-tji-joists/