Commercial wood doors are 1 3/4" thick and can be solid core or hollow core. If you are installing the door into a hollow metal frame,
it will always be 1 3/4" thick. 1 3/8" thick woood doors are usually used in residential prehung units
which consist of the door already installed in the wood frame with the
hinges. It will be prepped for a lock which will
be installed on the jobsite. Prehungs with 1 3/4" thick doors are very common in commercial
Hollow core wood doors are obviously never used at exterior openings and are usually used
at interior residential although they are also sometimes used on commercial buildings because
of their low price. The majority of prehung units we have supplied over the years have been
solid core since we deal in commercial doors. If the door is going into a hollow metal
frame, it will almost always be a solid core. This type of door is available in either stave
or particle core. Particle core is the most common as it is less expensive than the stave core
which is a solid lumber core door. There has been a lot of improvement with particle core
doors and that is generally what is called for now when solid doors are needed.
Although wood doors are available in many types of veneers, the most common are oak, birch,
hardboard, and medium density overlay (MDO). Oak is good if you are staining the door although
birch is available in a stain grade and is less expensive. Oak doors usually are not painted
as the grain will show through afterwards and if you are going to cover it up with paint, you
might as well go with a cheaper veneer.
Wood doors are available in fire rated (up to 90 minutes) and non fire rated. Keep in mind that the cores on fire rated wood doors are different than a non-fire rated wood door. In hollow metal doors, the core stays the same (except in temperature rise doors), with the only difference being the size of glass you are allowed for each different fire rating. All that said, fire rated wood doors can get a bit expensive due to the type of core required. If you are going to paint the doors in the end, you may want to consider hollow metal doors if you need fire rated doors and need some "value engineering".
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