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Inswing Width Measurements

The width of an exterior door unit is dependent on three things: configuration, unit construction, and door swing

The configuration of the unit corresponds to pieces and parts of the unit. If a unit is a single door only, the width will be much smaller than a triple patio door. The more components used to create a unit will result in a wider unit.

Construction relates to a continuous or boxed unit. Most units are continuous, meaning they utilize a single head jamb and a single sill. A boxed until will be constructed of separate units coming together. One of the benefits of a boxed unit is the ability to include mull pockets which makes the unit even wider in the scenario that a standard unit will not fit in the rough opening of the building.

The swing of the unit is the final factor of the unit width as the brickmould sits different on an outswing unit than it does on a inswing unit, resulting in different dimensions.


Component Sizes

While every unit type needs different components, the size of the components are typically the same.

  • An exterior jamb measure 3/4″.
  • An astragal measures 7/8″.
  • A standard mullpost measueres 1″.
  • A fat boy mullpost which is used in venting sidelite units measures 1-1/2″.
  • Standard brickmould is 2″.
  • Most units also require clearance on the hinge and strike side of a door and this will range by construction type.

Measurement Types

There are four measurement types associated with units.

Unit Dimension (UD) is the measurement of the unit from the outside of the left jamb to the outside of the right jamb.

Brickmould Dimension (BD) is the measurement of the unit including the brickmould from the outside of the left brickmould to the outside of the right brickmould.

Rough Opening (RO) is the unit width dimension plus 3/4″ to account for installation of a unit into a building’s rough opening.

Masonry Opening (MO) is the brickmould width dimensions plus 1/2″ to account for the installation of a unit into a building’s masonry opening.


Continuous Unit Measurementss

Below are the components used in each unit configuration as well as the UD, RO, BD, MO.

Single Door

Components: 2 jambs, door, clearance.

Based on a 36” Door slab, the width measurements are as follows:

UD RO BD MO
37-5/8″ 38-3/8″ 40-1/8″ 40-5/8″

Single Door, One Sidelite with Standard Mullpost

Components: 2 jambs, sidelite, mullpost, door, clearance.

Based on a 36” Door slab and a 12” sidelite, the width measurements are as follows:

UD RO BD MO
50-5/8″ 51-3/8″ 53-1/8″ 53-5/8″

Single Door, One Sidelite with Fat Boy Mullpost

Components: 2 jamb, sidelite, fat boy mullpost, door, clearance.

Based on a 36” Door slab and a 12” sidelite, the width measurements are as follows:

UD RO BD MO
51-1/8″ 51-7/8″ 53-5/8″ 54-1/8″

Single Door, Two Sidelites with Standard Mullposts

Components: 2 jambs, 2 sidelites, 2 mullposts, door, clearance.

Based on a 36” Door slab and 2-12” sidelites, the width measurements are as follows:

UD RO BD MO
63-5/8″ 64-3/8″ 66-1/8″ 66-5/8″

Single Door, Two Sidelites with Fat Boy Mullposts

Components: 2 jamb, 2 sidelites, 2 fat boy mullposts, door, clearance.

Based on a 36” Door slab and 2-12” sidelites, the width measurements are as follows:

UD RO BD MO
64-5/8″ 65-3/8″ 67-1/8″ 67-5/8″

Double Door with Astragal

Components: 2 jambs, astragal, 2 doors, clearance.

Based on a 2-36” Door slab, the width measurements are as follows:

UD RO BD MO
74-9/16″ 75-5/16″ 77-1/16″ 77-9/16″

Double Door with Astragal, Two Sidelites with Fat Boy Mullposts

Components: 2 jambs, 2 sidelites, 2 fat boy mullposts, 2 doors, astragal, clearance.

Based on a 2-36” Door slab and 2-12” sidelites, the width measurements are as follows:

UD RO BD MO
101-9/16″ 102-5/16″ 104-1/16″ 104-9/16″

Double Door with Standard Mullpost

This type of unit is often referred to as a patio unit as one fo the doors is stationary.

Components: 2 jambs, mullpost, 2 doors, clearance.

Based on a 2-36” Door slab, the width measurements are as follows:

UD RO BD MO
74-11/16″ 75-7/16″ 77-3/16″ 77-11/16″

Triple Door with Standard Mullposts

Components: 2 jambs, 2 mullposts, 3 doors, clearance.

Based on a 3-36” Door slab, the width measurements are as follows:

UD RO BD MO
111-11/16″ 112-7/16″ 114-3/16″ 114-11/16″

Boxed Units

Below are the components used in each unit configuration as well as the UD, RO, BD, MO.

Single Door, One Sidelite

Components: 4 jambs, sidelite, door, clearance.

Based on a 36” Door slab and a 12” sidelite, the width measurements are as follows:

UD RO BD MO
51-1/8″ 51-7/8″ 53-5/8″ 54-1/8″

Single Door, One Sidelite, Mull Pocket

Components: 4 jambs, sidelite, door, mull pocket, clearance.

The mull pockets can range from 1/4″ to 3″ or larger depending on the pocket covering material.

Based on a 36” Door slab, a 12” sidelite, and a 1-1/2” mull pocket, the width measurements are as follows:

UD RO BD MO
52-5/8″ 53-3/8″ 55-1/8″ 55-5/8″

Single Door, Two Sidelites

Components: 6 jambs, 2 sidelites, door, clearance.

Based on a 36” Door slab and a 2-12” sidelite, the width measurements are as follows:

UD RO BD MO
64-5/8″ 65-3/8″ 67-1/8″ 67-5/8″

Single Door, Two Sidelites, Mull Pockets

Components: 6 jambs, 2 sidelites, door, 2 mull pockets, clearance.

The mull pockets can rangs from 1/4″ to 3″ or larger depending on the pocket covering material.

Based on a 36” Door slab, 2-12” sidelite, and 2 1-1/2” mull pockets, the width measurements are as follows:

UD RO BD MO
66-1/8″ 66-7/8″ 68-5/8″ 69-1/8″

Double Door with Astragal, Two Sidelites

Components: 6 jambs, 2 sidelites, 2 doors, astragal, clearance.

Based on a 36” Door slab and a 12” sidelite, the width measurements are as follows:

UD RO BD MO
101-1/2″ 102-1/4″ 104″ 104-1/2″

Updated on May 9, 2019

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