Trenched or Non Trenched Door Lining

[colin7777]

Need to now order door linings and can see there are trenched and untrenched, I can see the difference between the two types.  The trenched linings are quoted as 838mm, the doors we are looking at are as 838mm 2ft 9in.

 

How safe is it to guarantee that doors and linings will be actuate enough to fit correctly. I don't want to trim the door as they are prefinished

 

If I bought untrenched will they have to be trenched or can the uprights be butted against the top lining.

 

Looking at primed linings.

[nod]

I’ve always used Trenched 

But I’m on a job of 200 homes at the moment All are untrenched They simple have three battens tacked to the casing

[SimonD]

Easy enough to trench with a trim router - it does look and finish nicer, that's how I did all mine as nobody sold liners for my size doors and wall thicknesses.