MDF or wood door linings?

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Can I have some views please on using MDF for door linings and fire linings. Will pink 25mm fire linings be sufficient as I know wood linings needs to be around 30mm or 32mm.

Also is best to splash out and us moisture resistant ones everywhere despite it going to be painted white?

How do I go for stronger density ones, are they graded? I've got some large opening depths like 380mm in some places and have been quoted a few hundred pounds just for one door material in wood. So what to avoid using it but only if MDF is good.
 
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Can I have some views please on using MDF for door linings and fire linings
I have never used MDF for linings for fear of repeated door on - door off will leave the screw holes baggy. I'm a big fan of skirts, archies and window boards of the MDF flavour though.

I've got some large opening depths like 380mm in some places
Why do you need to line the full wall thickness?
 
I've never known the full wall thickness to not be lined. It would look odd wouldn't it any other way?
 
I’ve hardly ever seen the full width lined. Surely this is what’s normally done (pic)
 

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So, that wall is plaster skimmed for the most part and then lined for the smaller part? Or is it skimmed the entire length and then lining put on top?

Would MDF make for a good replacement for solid wood lining when it comes to installing 3 lever mortice dead locks etc or will it be easy to crow bar out (I know nothing is impossible but compared to normal wood linings)?

And how do I deal with fire rated doors and MDF linings, pink MDF 25mm?
 
So, that wall is plaster skimmed for the most part and then lined for the smaller part? Or is it skimmed the entire length and then lining put on top?
If you have the width tolerance, then it is better to dab boards onto the wall, get it nice and flat and upright, then fix the casing onto the boards. Skim it later.

Fire rated casings are fixed the same. You just need to ensure you have the correct door fitting gap (top sides etc) and all the smoke/fire seals in place.
 

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