Introduction to Metal Doors: Residential & Commercial

There was once a time when people could leave their front doors open and not worry about anything untoward happening. Unfortunately, those days are long gone, and home invasions – with their attendant implications on so many innocent lives – have become an unpleasant, but very real, daily occurrence. Today, simply locking the door may not be enough to ensure your security, which is why more and more people are looking for impenetrable doors.

Metal doors are without a doubt the toughest there are in the market. Any place that needs to be secured should definitely have one or more metal doors. If you’re looking for added security for your home or place of business, then you’ll certainly need metal doors.

However, with so many different types and designs available, how would you know which ones would be right for your application? To figure this out, you’ll need to know the basic characteristics of metal doors.

Metal doors are classified according to their cores. The most common cores that you’ll encounter are:

  • Honeycomb – ideal for areas that do not require high thermal insulation
  • Polyurethane – best for cold climates since these provide superior insulation
  • Polystyrene – these also have an insulated core, but are best for areas that require a specific insulation factor (R-value or U-value)
  • Steel Stiffened – these doors are normally used for high traffic areas, but usually lack aesthetic properties
  • Temperature Rise – these are fire resistant doors that prevent heat from transferring from one area to another

Other than selecting the core, you’ll also need to select the doorframe. Your choices in door frames are cold rolled steel, galvanized steel, and galvanneal steel. Frames made from cold rolled steel are best for interior applications. Meanwhile, galvanized steel frames offer more protection against corrosion, making them ideal for areas that are exposed to the elements. Galvanneal steel frames, on the other hand, have rust-resistant properties; however, primer and paint do not adhere to this type of material well, limiting aesthetic benefits.

Whether you’re selecting a metal door for a business location or for residential use, it’s imperative that you choose the right type of core and doorframe. In Part II, we’ll go deeper into the pros and cons of metal doors so you’ll be able to gauge whether you need to focus more on the strength of the door or its aesthetic properties.