Door casing or lining?

R&C

I'm confused! Wht's the difference? We need to replace all the doorframes thoughout along with the doors but I've no idea what we should be ordering! I am mainly referring to the Howdens brochure, and they have...

Unassembled softwood door frames

Assemled door frames with hardwood sill

Door linings with untrenched head (?)

Door Linings including stops with untrenched head

Door casings

Rebated Door Casing sets untrenched head

I have figured out what the door stops are, but not sure what 'untrenched head' means and if I need it?

Sorry for what is quite possibly a very silly question!

leveller2911

R&C wrote: »

I'm confused! Wht's the difference? We need to replace all the doorframes thoughout along with the doors but I've no idea what we should be ordering! I am mainly referring to the Howdens brochure, and they have...

Unassembled softwood door frames

Assemled door frames with hardwood sill

Door linings with untrenched head (?)

Door Linings including stops with untrenched head

Door casings

Rebated Door Casing sets untrenched head

I have figured out what the door stops are, but not sure what 'untrenched head' means and if I need it?

Sorry for what is quite possibly a very silly question!

Hi R&C,
The trenching in the head of a door lining is a groove .There is a groove at each end of the head which will be generally 2'6" or 2'9" apart(one each side of the head,you fit the legs depending what sized width of door you need) between the groove. When each leg(upright) is screwed into the trenched head the "opening"(space between the legs) will fit a standard size door nicely.
If a lining is "untrenched" then you can scew the legs on to whichever width of door you need ,handy if your doors are not a standard size.Personally I would still "trench"(groove) the head as it makes a better job..

" Door frames" are for external doors and "door linings" are fro internal doors.The difference is the external ones are draught stripped and have sills that stick out like a window frame at the bottom of the frame.

I haven't got my Howdens catalogue here but traditionally a door "casing" is similar to a lining but with a lining the "door stops" are supplied loose which you then nail on the lining whereas a door casing the door rebate is rebated from one piece of timber and not nailed on..

Wherryman

Here is an example of a pre trenched top rail for a door lining (just one side), as you can see there is a trench on both sides, this is so the lining can be made up to fit either of two different door widths.
Normally you would buy pre-trenched linings for new doors as they are made to match the width of the door and use untrenched heads when you want to refit old doors as they can and usually are odd widths.

R&C

Thank you so much to both of you, i completely understand now!