Pier foundation: bottom framework 'suspended' with metal hooks/ add reinforcement gaps?:

[Plupp 290759]

I have taken a photo of a house with high posts/post foundation and floor joists against the ground. These supporting beams at the bottom of the floor against the ground have visibly no nail heads or screw heads indicating that the beams are fastened, but as in the photo, there is a metal hook embedded that holds up the supporting beam creating the floor joists.

See photo of supporting beam in the floor against the ground with metal fittings it's been hung in.

Question;
if the thin floorboards against the ground gap and sag and let mineral wool show through the gaps, -if I reinforce this so that the mineral wool does not show, where and how are the boards added to the floor joists? The only beams at the bottom of the floor appear unseen when looking up at the floor joists under the house, as they have never been visibly screwed or nailed. I can't add an identical super-heavy 3-meter-long supporting beam across as when the house was built. I can't nail into paper-thin boards to stop the mineral wool from falling out — use sticker boards.

How does one do this simply?

from an unknowledgeable and non-technical person — the veteran pool has
many bad reviews, and companies only take on big jobs.

 

[AndersS]

but has like in the photo a metal hook that is sort of embedded and this metal hook holds up a supporting beam that creates the bottom frame.

It's a joist hanger you see, you can google that.
Then I don't quite understand what you want to do/write.

 

[Plupp 290759]

It's a joist hanger you see, you should google it.
Then I don't quite understand what you want to do/write.

thanks. joist hanger. will google. if the thin sheets that serve as the bottom floor and hold in the mineral wool bulge and sag so the mineral wool is exposed, then I can't nail support boards that press the mineral wool into these thin sheets. If I nail into the load-bearing beam with the joist hanger, there will be a gap. where do I nail support boards or do I create double boards so there isn't a gap against the flimsy bulging thin sheets that make up the bottom floor against the ground?