How Thick is an Interior Door?

Interior doors come in a variety of sizes and materials, which affects the thickness. Factors such as intended use of the door, sound insulation needs and style preferences all affect the overall thickness. When considering the most common interior door size (80” x 36”), usually referred to in terms of rough opening size, most builders opt for 1 3/8th inch thick doors. This generally allows ample room for hinges and jamb depth requirements. This thinness provides enough strength for everyday use but is not sufficient for high traffic areas where sound insulation and extra security are needed. In this case, one may choose to go with thicker 1 3/4 inch or 2 inch doors instead. The added layers will provide extra density to help absorb soundwaves more effectively. In addition, heavier duty locksets and closer fixtures can be used on these thicker doors when increased security is desired. As a rule of thumb, 1 ⅜” doors are typically best suited for residential purposes while anything over 1 ¾” is typically better suited as an entrance door or commercial setting due to their higher degree of durability and strength. Achieving balance between aesthetics and functionality is fundamental in selecting the appropriate thickness for any door system which further emphasizes why it’s important to always consider all factors before making your selection!

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