Contact surface between subfloor and joists

[phloaw]

I had to remove portions of the existing subfloor chipboard panels (18mm depth), which now I need to replace (I already bought a new P5 panel).

The problem is that one edge of the hole is irregular, and I'm worried that parts of the new chipboard won't have sufficient resting contact with the joists to provide enough support.
Particularly around the lower-right corner in the pics, where the exposed joist surface is really thin.

What is a good strategy in these situations? I would really want to avoid removing the surrounding subfloor.
Thanks!

 

[bobasd]

why are you replacing the boards?

anyway, you dont have to land perfectly in the middle of the joists and noggins - after lifting the boards you can screw some ledgers/bearers to the joists and the noggins to pick up all the edges of the chipboards.
use screws for everything - dont use nails.

if you cut the c/boards accurately then possibly there will be no need for ledgers?

 

[phloaw]

why are you replacing the boards?

Two reasons:

1) I had to cut two planks to access the area I needed. By replacing the two original pieces with a single one, I hope to increase the strength of the subflooring. Does that make sense?

2) To remove them, I had to damage the two pieces of chipwood.

if you cut the c/boards accurately then possibly there will be no need for ledgers?

Yes, that's what I hope to achieve.

anyway, you dont have to land perfectly in the middle of the joists and noggins - after lifting the boards you can screw some ledgers/bearers to the joists and the noggins to pick up all the edges of the chipboards.
use screws for everything - dont use nails.

Definitely: I hate nails, especially after the trouble endured to remove the old ones

Can you recommend any particular type of screw for this job? Size? Style? Material?
Thanks!

 

[Deleted member 174758]

Chipboard screws. These have a countersink head and a deep full length thread.

 

[foxhole]

Just correct the cuts .