Intermediate joist 45x220 has shrunk

[HomeboY]

We built a 1.5-story house in January 2019, which was completely finished in June. I am now decorating the upper floor and have a small concern in connection with this. Since we are going to have a bathroom on the upper floor, I need to add new 45x220 C24 joists so I can achieve CC30 exactly where the bathroom will be. The problem is that the new 45x220 joists I have installed are higher than the existing ones that have been in place for almost a year. The existing ones are up to 10 mm lower (about 210 mm).
This poses a problem when I am going to lay chipboard on this; how should one best solve this? Should I plane down the new ones so they are at the same level, or what should be done? It's worth mentioning that it's the exact same timber (SCA 45x220 C24 G4-2).

 

[useless]

Planing them down is foolish because the new studs will also dry and shrink. You'll simply have to wait until they have dried. Luckily, the wood dries best in winter.

 

[HomeboY]

Planing them down is pointless since the new studs will also dry and shrink. You'll simply have to wait until they have dried. Fortunately, the wood dries best in winter.

That thought crossed my mind too... However, it feels tedious to wait for drying when we've already started the project. Ordered stairs, plumber, etc. How long might one need to wait, do you think? I want to be able to lay down the floorboards so we can put up a ladder and insulate up to the ridge. Might need to buy a moisture meter...

 

[sixten88]

Absolutely no problem planing them down as long as you glue and screw the floorboards well. The fact that they shrink later will not matter.

 

[HomeboY]

Absolutely no problem to plane them down as long as you glue and screw the floorboards well. The fact that they shrink later will not matter.

Thanks for your response. I am currently leaning towards planing some down. I've noticed that it's not just the newly inserted beams that are higher; the rafters also differ from other intermediate beams. Otherwise, I will have a nightmare with the floor installation.