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A Guide To Measuring A Hollow Metal Door Rough Opening

Hollow metal doors are on almost every commercial building. Whether they are used as a security door, fire door, or back entry door, hollow metal doors are everywhere. In this guide we explain how to measure a rough opening for a hollow metal door. This is very important if you are planning on installing a new hollow metal door or replacing an existing hollow metal door.

Two Types Of Door Frames

Before determining the rough opening for a hollow metal door, you have to understand that there are two types of hollow metal door frames.



Drywall Frames

There is a drywall frame which is always shipped disassembled or "knocked down" in three pieces. Drywall frames are interior door frames and designed with compression anchors. They work by wrapping around the building wall. The frame wraps around the drywall, and compression anchors are adjusted to hold the door frame in place. The most important factor to understand here, is that a drywall frame wraps the wall. This is important for determining the door's rough opening. The formula below shows how to calculate the rough opening for a drywall frame.

Rough Opening Formula For Drywall Frames That Wrap Around The Wall:


Rough Opening Width = Door & Frame Width + 2"
Rough Opening Height = Door & Frame Height +1"


For example, if your door package is a 3'0" x 6'8" package, then the rough opening would be 38" x 81"

Masonry Frames

The other type of door frame is known as a masonry frame. We call it a masonry because it is typically used for exterior door applications, so installation on block wall, brick, or concrete is common. Masonry frames are most commonly installed with punch and dimple anchors, however a variety of door frame anchors are available including metal stud and wood stud anchors. Masonry frames can be installed, wrapping the wall, or they can be installed butted up against the wall.

Rough Opening Formula For Masonry Frames That Wrap Around The Wall:


Rough Opening Width = Door & Frame Width + 2"
Rough Opening Height = Door & Frame Height +1"


For example, if your door package is a 3'0" x 6'8" package, then the rough opening would be 38" x 81"

Rough Opening Formula For Masonry Frames That Are Butted Up Against The Wall:


Rough Opening Width = Door & Frame Width + 4-1/2"
Rough Opening Height = Door & Frame Height + 2-1/4"


For example, if your door package is a 3'0" x 6'8" package, then the rough opening would be 38" x 82-1/4"

Use this page to quickly find what size hollow metal door and frame package you need for the rough opening in your building.


Rough Opening Chart For Common Metal Door Frame Sizes

Below are the most common hollow metal door sizes used in commercial buildings. Use this chart to quickly find the needed rough opening without having to do the calculation.

Rough Openings For Hollow Metal Door Frames That Wrap Around The Wall:

Door & Frame Size: 2’0” x 6’8” Rough Opening Size: 26“ x 81”
Door & Frame Size: 2’4” x 6’8” Rough Opening Size: 30“ x 81”
Door & Frame Size: 2’6” x 6’8” Rough Opening Size: 32“ x 81”
Door & Frame Size: 2’8” x 6’8” Rough Opening Size: 34“ x 81”
Door & Frame Size: 3’0” x 6’8” Rough Opening Size: 38“ x 81”
Door & Frame Size: 3’4” x 6’8” Rough Opening Size: 42“ x 81”
Door & Frame Size: 3’6” x 6’8” Rough Opening Size: 44“ x 81”
Door & Frame Size: 3’8” x 6’8” Rough Opening Size: 46“ x 81”
Door & Frame Size: 4’0” x 6’8” Rough Opening Size: 50“ x 81”
Door & Frame Size: 2’0” x 7’0” Rough Opening Size: 26“ x 85”
Door & Frame Size: 2’4” x 7’0” Rough Opening Size: 30“ x 85”
Door & Frame Size: 2’6” x 7’0” Rough Opening Size: 32“ x 85”
Door & Frame Size: 2’8” x 7’0” Rough Opening Size: 34“ x 85”
Door & Frame Size: 3’0” x 7’0” Rough Opening Size: 38“ x 85”
Door & Frame Size: 3’4” x 7’0” Rough Opening Size: 42“ x 85”
Door & Frame Size: 3’6” x 7’0” Rough Opening Size: 44“ x 85”
Door & Frame Size: 3’8” x 7’0” Rough Opening Size: 46“ x 85”
Door & Frame Size: 4’0” x 7’0” Rough Opening Size: 50“ x 85”
Door & Frame Size: 3’0” x 8’0” Rough Opening Size: 38” x 97”
Door & Frame Size: 4’0” x 8’0” Rough Opening Size: 50” x 97”
Door & Frame Size: 6’0” x 6’8” Rough Opening Size: (Double Doors) 74” x 81”
Door & Frame Size: 6’0” x 7’0” Rough Opening Size: (Double Doors) 74” x 85”

Hollow Metal Door Frames That Are Butted Against The Wall:

Door & Frame Size: 2’0” x 6’8” Rough Opening Size: 28-1/2“ x 82-1/4”
Door & Frame Size: 2’4” x 6’8” Rough Opening Size: 32-1/2“ x 82-1/4”
Door & Frame Size: 2’6” x 6’8” Rough Opening Size: 34-1/2“ x 82-1/4”
Door & Frame Size: 2’8” x 6’8” Rough Opening Size: 36-1/2“ x 82-1/4”
Door & Frame Size: 2’10“ x 6’8” Rough Opening Size: 38-1/2“ x 82-1/4”
Door & Frame Size: 3’0” x 6’8” Rough Opening Size: 40-1/2“ x 82-1/4”
Door & Frame Size: 3’4” x 6’8” Rough Opening Size: 44-1/2“ x 82-1/4”
Door & Frame Size: 3’6” x 6’8” Rough Opening Size: 46-1/2“ x 82-1/4”
Door & Frame Size: 3’8” x 6’8” Rough Opening Size: 48-1/2“ x 82-1/4”
Door & Frame Size: 4’0” x 6’8” Rough Opening Size: 52-1/2“ x 82-1/4”
Door & Frame Size: 2’0” x 7’0” Rough Opening Size: 28-1/2“ x 86-1/4”
Door & Frame Size: 2’4” x 7’0” Rough Opening Size: 32-1/2“ x 86-1/4”
Door & Frame Size: 2’6” x 7’0” Rough Opening Size: 34-1/2“ x 86-1/4”
Door & Frame Size: 2’8” x 7’0” Rough Opening Size: 36-1/2“ x 86-1/4”
Door & Frame Size: 2’10“ x 7’0” Rough Opening Size: 38-1/2“ x 86-1/4”
Door & Frame Size: 3’0” x 7’0” Rough Opening Size: 40-1/2” x 86-1/4”
Door & Frame Size: 3’4” x 7’0” Rough Opening Size: 44-1/2“ x 86-1/4”
Door & Frame Size: 3’6” x 7’0” Rough Opening Size: 46-1/2“ x 86-1/4”
Door & Frame Size: 3’8” x 7’0” Rough Opening Size: 48-1/2“ x 86-1/4”
Door & Frame Size: 4’0” x 7’0” Rough Opening Size: 52-1/2“ x 86-1/4”
Door & Frame Size: 3’0” x 8’0” Rough Opening Size: 40-1/2” x 98-1/4”
Door & Frame Size: 4’0” x 8’0” Rough Opening Size: 52-1/2” x 98-1/4”
Door & Frame Size: 6’0” x 6’8” Rough Opening Size: (Double Doors) 76-1/2” x 82-1/4”
Door & Frame Size: 6’0” x 7’0” Rough Opening Size: (Double Doors) 76-1/2” x 86-1/4”

Conclusion

The first step to any hollow metal door installation is verifying the rough opening. This article will help guide you for any hollow metal door size. When you need hollow metal doors, shop Patriot hollow metal doors. Unlike other door brands, Patriot hollow metal doors are manufactured in the USA and provide a level of quality and craftsmanship unrivaled by anyone. Order today and receive FAST, FREE shipping.




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