I'm working on furnishing the attic of our "1.5-story" house. The house was purchased as prepared for an upper floor. I've installed joists under the future bathroom to achieve cc30. I bought c24 220x45, which according to the plans, was already there. After placing them loosely to facilitate the plumber who is coming on Wednesday, I notice that there's a 4-5 mm height difference between the existing joists and the ones I've put in place.

The new ones measure slightly over 220mm, the existing ones just under 220mm.

Any tips on how to resolve this before installing the upcoming floor panels?
 
Strips with masonite, tar paper or something else that builds enough to achieve the same level?
 
I just noticed that the new ones were taller... Cut a little off! If you don't have a table saw, it's well-invested money, a table in the 1000-krona class is good enough if you're not going to work with fine carpentry...
 
They will probably be 5mm lower after half a year indoors, especially during winter and spring when the indoor humidity is quite low, causing "brädgårdstorrt" timber to shrink.
 
It's a bit annoying that they shrink (because they do). The problem is that they also shrink a bit differently. The best thing to do is to install them now, let them dry for a few months, and then, before you screw down the floor chipboard, plane down those that stick up.

I understand if you can't wait that long.
 
M
It's just like with the decking on the terrace, it swells at least 5mm on a 120mm board when it gets humid outside.... Bring the wood inside and let it dry for a week and see what happens to it.
 
Mikael_L
Well, let it dry and then plane off the remaining difference.

A cheap electric planer will probably do the job brilliantly, practice on some other scrap pieces first if you haven’t used an electric planer before.
http://www.jula.se/elhyvel-600w-030002

If it ends up poorly/unevenly planed, can’t you just place the planed side downwards instead?
 
The beams will have to stay for about 2 more weeks before the floor chipboard needs to be laid, then the carpenters will insulate the pitched roof.

I called the carpenter today and he talked about moisture in the wood. The question is what consequences this might have in the future. Anyone dare to make guesses?
 
If by consequences you mean the moisture itself, then there are no problems at all, it will dry out. The consequences come when you lay the chipboard, it will only rest against the new studs and then they're pointless.

Let them dry as long as you can and cut them down to the right height before installing them. There's not much else to do as I see it. I don't think you can get hold of furniture-dried 2"x9".
 
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