Un level ceiling

[chriselevate]

I've had a nightmare in my lounge so I'm reaching out for some advice before possibly going down a wrong route again. To cut a long story short... I've had to remove the 4.4 x 4.6m lounge ceiling in order to get rid of an uneven boarded and plastered ceiling.

Now it's all out I can see that some of the joists are not level and some are twisted. I'm not talking a lot but I know that 2-5mm out will create a un level ceiling when the new boards are up.

How would you suggest getting the ceiling level now the ceiling is down please?

I am looking at having furring bars/genie clips fitted followed by 2 sheets of 15mm acoustic board with a layer of tecsound SY70 in between.

Thanks for your help and advice. I'd like to get a joiner round to have a look and have an idea of what options you guys suggest so I know if what he suggests is good.

 

[23vc]

Pack the firrings to get them all level and then you’re good?

 

[roy c]

You could "cross batten" it with2"x1" treated batten and find the lowest joist and make that your datum to work to. Get some thin wooden packers and pack the battens so they are level..

 

[23vc]

I thought exactly that Roy but then noticed he was using firrings / resilient bars so may as well pack them unless I’m missing something

 

[TicTac]

Sister 2x1s alongside the current joists, working from the lowest one, as Roy C suggested; but untreated is fine.

 

[roy c]

At least you get peace of mind when you use tanalised timber...