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I've made sure that all the normals are facing the right way but when I tried re importing the model again back to unity some faces are still missing I tried doing this the other way around and it still doesnt work... I also tried doing this both with .blend and .fbx but to no avail

is there anyway to fix this?

here is the blender version:

enter image description here

and this is what it looks like when imported into unity:

enter image description here

Thank you in advance

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I have seen your question. The problem is with using normal maps. Normal Maps can have some errors. You should rather go with displacement maps, but I wouldn't recommend it because it eats up a lot of space. I would say you model each individual plank and then arrange them in your way and then join them. Or if you would like control over each individual plank in unity, then export it without joining. This may seem tedious but in the long run is more useful and gives you more control. I am guessing the normal maps are the planks itself, but if the normal maps are the texture and detail on the planks, then I would say go with displacement maps.

If it still doesn't work, then it's a problem with Unity. I would suggest you duplicate the model, rotate it on the X-axis and place it below the original planks. It would give it some depth and it will make your problem look better.

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