Edward Thompson
Hi James I am presuming you have a timber door which is probably in an exposed position so is subject to expansion and contraction depending on the weather. First of all check that there is a 3mm gap all around the door (check during dry weather) if not plane to suit, you also need to put a leading edge on the lock edge of the door ( a 2mm bevel that runs down from the face towards the back of the door ) this will provide additional clearance when opening and closing the door. Finally paint or stain the door with a good quality paint ensuring you do the top and bottom edges. Hopefully this will sort the problem out. Ed
