Cutting down internal doors

[Smk80]

Hi there I am replacing some internal doors, two of the openings are not your standard size and will need approx 35mm trimmed off the top and bottom (so 70mm total). Doors I am looking to purchase are Howdens shaker style with medium/semi solid core. The manufacturers recommendation is max 12mm trim from each side.

In others experience is this just a recommendation to cover their backs/guarantee? Looking at the current doors they are a cheap brand with hollow core and appear to have been trimmed more than 12mm and there is no core being exposed, it would appear the lip/frame is solid well beyond the recommended trim of 12mm.

Any advice appreciated

 

[Deleted member 174758]

A lot of 35mm doors are not solid core, so if you cut down by more than the manufacturer's recommended maximum you may find yourself witha hollow end or maybe chipboard or even cardboard "egg carton" infill. Even so, it is often possible to "de-skin" the offcut from the end of the door and to glue that in the open end to restore strength, although it should be noted that you may have to chisel out some of the infill if you have a chipboard core door.