Level Subfloor Under Plywood Before Tiling?

[grubburg]

I'm off level 1/8'' over 2' and 1/4'' over 4', from left to right in picture.

Building recessed shower for schluter pan.

What can I use to shim between joists and plywood to level out? Roofing felt? Drywall shims? I need something I can screw through but which won't compress. Looking for ideas less messy/time consuming than self leveler.

Thanks!

 

[Tile life]

Why not plenty of the multicoloured packers that carpenters use. Then cuts of timber ( with the grain) where it gets too big for packers. Just use them every 6 inches or so for a solid base.

 

[grubburg]

multicoloured packers t

i goggled "multcoloured packers" and dind't find anything?

 

[Nixxxy]

i goggled "multcoloured packers" and dind't find

https://amzn.eu/d/5xpYqAN

Something like those.