Door adjustment issues
On the first door: If the door fits in the jamb correctly, then you need to lower the strike plate. Since you can get it to latch by pulling up, then it isn't far off. Remove the stike and file the bottom of the opening about 1/8" lower. Reinstall the strike plate and remove any wood that shows at the bottom of the latch reciever hole.
The second door: I'm assuming this is a wooden jamb. You'll need to move the strike plate closer to the stop. Measure how much free play you have betwen the door and the stop when the door is latched. Do this at the knob. That is the amount that you'll need to move the strike towards the stop. Remove the strike and move it that distance. You may have to enlarge the recess in the jamb that the strike sets into. Do that with either a wood chisel or utility knife. wood glue some toothpicks or wood slivers into the old screw holes. Make new screw holes in the correct place with an ice pick or an awl. Drill them if you have to, but be careful not to oversize them. Reattach the strike plate. Be careful not to move the strike too close to the stop or the door won't be able to latch at all.
One thing I forgot to mention. If these are key locked doors and have a deadlatch, you'll have a two piece spring loaded latchbolt sticking out of the door. The small "D" shaped plunger should never enter the hole in the strike plate when properly latched. The large plunger is the only one that should hold the door closed while the small one is held depressed by the strike plate.
Last edited by Maintenance 6; 09-05-2008 at 08:51 AM.