Entrance doors set the stage for what people think of your home. They are your vertical welcome mats. Some cultures consider the main entrance door the most important feature of the house.
The entrance doors sure do take a beating. These doors are heavily used and are exposed to the elements year round. This is particularly true when there is not a significant overhang or porch roof to protect them.
If you don't keep them well caulked you will regret it. Water will leak around them and the damage can be significant. Take a look at the MESS page to see what we mean.
Most doors on the interior of the home are hollow core doors. Hollow core doors are usually a honeycomb cardboard core with wood strips along the perimeter. The door slab surfaces are most often a decorative pressed board or wood veneer panel. They are lighter and much less costly than solid core doors.
Solid core doors are doors with a core of solid wood pieces glued together and covered with veneer. The veneer layer can be wood, fiberglass or steel. These doors are very stable and are used for entrance doors. They offer greater security than a hollow core door. They can also be fire rated. Solid core doors are used for interior doors in high end housing.
Pocket doors are doors that slide into a void in the wall adjacent to the door. They don't swing into the room and are used as space savers.
Bypass doors are named as such because the panels slide in front of or behind each other. They are usually found on closets with both panels being operational. Many patio doors are of the bypass variety but with only a single panel that slides. People usually call bypass doors sliding doors.
Bifold doors are usually installed as closet doors. There are hinges between two door slabs with a track along the top of the opening. These doors are opened by pulling a knob installed on the face of one of the panels. The door then flexes on the hinges and moves to the side of the opening. For wider openings there are usually two pairs of doors.
French doors are installed as either interior or exterior doors. There are two panels with the hinges at either side of the door opening. Most of the time both panels are operational. With both panels open the door opening can be quite large.