Recommended Space Between Bottom Of Interior Door And Floor

Also referred to as net door size.

Recommended space between bottom of interior door and floor.

Each room except for bathrooms and kitchens should be equipped with its own cold air return duct for proper heating and cooling distribution. The largest measured width by height of the door leaf as manufactured. Check to see if your door will close over it by placing a small piece of it on the floor under the. If you are hanging a pre hung door on a bare subfloor you put the door right on the floor and install it.

If a room is not equipped with a cold air return it should then have a transfer air grill installed between the room and adjacent hallway which may already have a cold air return. I have never seen a door set with that big of a gap unless it was to get past floors that were not level. Allowing a gap at the bottom of a door cannot support proper airflow. The standard i use is 1 2 over finish floors 3 4 is acceptable.

To determine actual door size the following values are subtracted from nominal door size frame opening order size. Between a leaf of interior doors and the floor it is required to leave a gap of at least 2 2 5 cm to provide natural ventilation. That is a lot of room for unlevel you have there. If you are hanging a door on a finished floor you cut 3 4 off the bottom of the jamb then install.

Unlike interior doors gaps between a front door and a frame must go with the standards not so much due to the possible expansion of a leaf but because of the danger of penetration of cold air and extraneous. Either way it gives you about 3 4 clearance over the finished floor.