I have a window header that has been compromised by water…

I did receive them. Sorry for the delay, I was driving.

Do you have an awl?

Have you checked how deteriorated the wood is? If you stick an awl into where it appears rotted you can get a sense of the resistance. Do that again where you know it to be sound. This will give you at least a qualitative sense of how rotted the wood is.

That will inform, to some degree, what we discuss here.

If you don't have an awl, try a fine tipped screwdriver

Ok. Then let's assume the header is completely shot and needs to be replaced.

You'll need to shore the joists that are supported by the beam from the roof down to the ground. Then you can remove the existing beam and replace it with a new one.

Is it supporting one floor or two? What about the roof and attic?

What is the joist length supported by the beam?

Will it support any ceramic tile?

The pictures are very close up of just the beam and doesn't show any dimensions or lengths of joists. Or the number of floors supported. Or if there is ceramic tile.

That attachment was some kind of invoice.

Are the joists parallel to the header in question or perpendicular?

One floor, the attic, and the roof?

Will it support any ceramic tile?

What is the city and state so I can look at snow loading?

A triple 2x12 is a little oversized, but not by that much.

That's an appropriate beam.

No. for a 7'-3" span.

You said earlier it is a 7'-3" span.

I would go with the assumption they're all perpendicular and use the triple 2x12.

The beam needs to be replaced

To replacing?

You can't repair a rotted wood beam. Once the cellulose is destroyed, it's destroyed.

But you're attaching it to a rotted beam.

The joists would have to transmit load through rotted wood into fasteners into the steel, back into rotted wood through other fasteners to bear on the supports and ultimately to the foundation. You're tracking load through fasteners in rotted wood twice.

The wood beam in question is rotted, correct?

Between the existing rotted beams?

Well, they're holding up under the current load. They are not being subject to a full design load.

The wood fibers are damaged from moisture. There are obviously varying degrees

That's a very bold assumption to make. If all you lost is 1/4" of depth, then you don't need to do anything.

Assuming the rot is completely arrested.

But you can't cover your ass with an assumption that has no rational basis.

I need a very detailed and reliable understanding of the level of rot and locations on the beam.

Thank you. I'll look for it.