Doors should be fitted square, true and plumb and fixed in accordance with the manufacturer’s instructions. Three hinges should be fitted to all external doors, doors weighing more than 20 Kilograms and internal doors where large differences of temperature or humidity on opposing faces can be expected (e.g. bathrooms and airing cupboards).
Mortices for locks must not be cut through joints in the door framing as this will impair performance of the rail joint. If any part of a external door or door frame is cut or drilled, swab the newly exposed timber with a suitable preservative material and re-coat with primer or stain.
Fire resisting doors should not be altered on site. Cutting of glazing apertures on site must not be carried out without the approval of the door manufacturer and local fire officer. Ideally, the door frame should be set well back from the outer face of the wall or else be protected by a canopy. If not, the head of the frame should be provided with a protecting head drip. External doors opening outward should be particularly well protected.
Glazing panels in doors must satisfy the requirements in respect of safety glass. Bead glazing must be correctly fitted using compound or glazing tapes to both sides of the glass.
Always seek the advice of a qualified joiner / carpenter for further installation guidelines.