Pivot Door Design: Hardware, Sizing and Installation

A pivot door rotates about a vertical axis set into the floor and head of the opening, rather than swinging on hinges fixed to the side of the frame. That small change in where the door is held has large consequences. It allows doors that are much taller, wider and heavier than a hinged leaf could carry, it removes visible hinges from the edge, and it produces the slow, balanced swing that has made pivot doors a fixture of contemporary entrances.

This guide explains how the mechanism works, the main types of pivot, the hardware that does the work, the design and structural points that decide whether a pivot door performs well for years, and how the type fits a humid climate such as Singapore’s.

How a pivot door works

A conventional hinged door hangs from its jamb. Every kilogram of the leaf is cantilevered off a few hinge knuckles and screws into the frame, which is why heavy hinged doors sag and why there are practical limits to their size. A pivot set works differently. A bottom pivot fixed into or onto the floor carries the weight of the door, and a top pivot at the head of the frame holds the leaf upright and in alignment. Taller or heavier doors may add an intermediate pivot.

Because the floor carries the load, the frame no longer has to. That is the fundamental advantage. It is also the fundamental responsibility: the floor, the head of the opening and the fixings into both have to be designed for what they are now carrying.

A short history

The principle is ancient. Before metal hinges were common, many doors turned on pins or projecting stiles seated in sockets cut into a stone threshold and a lintel above; pivot stones and door sockets survive from many early civilisations. The hinge displaced the pivot for most ordinary doors because it is simpler to fit into a frame. The modern revival came with engineered pivot hardware and floor springs, which made it possible to hang large, heavy and frameless leaves, including glass doors in commercial buildings, and later the oversized timber and metal entrance doors now common in high-end residential work.

Centre-hung and offset pivots

Centre-hung pivot

The pivot axis is set some distance in from the edge of the door, within the centre of the leaf’s thickness. When the door opens, part of the leaf swings into the room and part swings outward, leaving two openings either side of the turned leaf. With the right hardware a centre-hung door can be double-acting, swinging both ways. The further the axis is set from the edge, the more the door behaves like a rotating panel or wall, which is the look many architects want for a main entrance.

Offset pivot

The axis is set close to the edge and to one face, so the door swings much like a hinged door, in one direction only. Offset pivots are handed and single-acting. They give a cleaner edge than hinges and carry weight through the floor, but they do not produce the dramatic rotating-panel effect. They are often used where a pivot door has to meet a conventional frame, a seal on one side, or a code requirement that the door open in a particular direction.

Pivot door hardware

Floor spring — a sealed unit recessed into the floor slab that combines the bottom pivot with a closing mechanism and hydraulic damping, controlling the speed of swing and often allowing the door to hold open at set angles. It needs a recess of adequate depth, which has to be planned into the slab and screed.
Surface or concealed bottom pivot — a simpler bearing without a closer, used where self-closing is not required.
Top pivot and top patch — the upper bearing, fixed into the head of the frame or a concealed steel section above the ceiling line.
Stops, seals and latches — pivot doors need purpose-made perimeter seals and stops; a standard rebated frame does not suit a centre-hung leaf.
Locks — multipoint locks, or locks into the floor and head, are common on large entrance doors because a single lock in the stile cannot hold a tall leaf flat against its seals.

Hardware is rated for a maximum leaf weight and size. Specifying within the manufacturer’s rating, with a margin, is more important for a pivot door than for almost any other door type, because the consequences of an overloaded bearing are a door that drops, drags and becomes hard to close.

Design guidance

Size and proportion

Pivot doors are often chosen precisely because they can be large, but a very tall, slender leaf is prone to twist and bow, particularly in timber. The leaf needs a stable core, often an engineered timber, aluminium or steel frame with facing panels, and a thickness appropriate to its height. Ask the door maker what dimensional tolerance the leaf will hold over its life, not just when it leaves the workshop.

Weather and climate

The gaps around a centre-hung leaf are harder to seal than a rebated hinged door. On an external entrance in Singapore, where rain is frequently wind-driven, the door is much better placed under a deep canopy or recessed into a porch than flush with an exposed facade. The threshold should be detailed with a fall away from the door and, where possible, a drainage channel. Timber leaves need a finish system suited to high humidity and strong sun, and regular maintenance; aluminium and coated steel are more stable but conduct heat, so consider thermal breaks if the door sits between an air-conditioned interior and the outside.

Interior use

Inside the home, pivot doors are used as concealed doors flush with wall panelling, as rotating screens between living and dining areas, and in glass for studies and wardrobes. Here the weather issues disappear but acoustic and privacy performance matter. For openings where swing space is tight, a pocket door or barn door may be a better fit; our guide to the types of doors compares the options.

Structural and installation considerations

A large pivot door can weigh several times as much as a standard door, and all of that weight bears on a small area of floor. The floor spring or bottom pivot needs a sound, level substrate, typically the structural slab rather than a deep bed of screed, and its recess must not cut reinforcement or conceal services in a way that compromises the slab. In an existing building, coring or chasing a slab for a floor spring should be checked before it is done; in an HDB flat or condominium, works that affect the structural slab are subject to approval. The head fixing is equally important: if the top pivot is anchored into a lightweight partition or a plasterboard bulkhead, the door will rack. A concealed steel or timber header, tied back to structure, is the usual answer.

Glass pivot doors add their own requirements. The glass must be toughened or laminated safety glass of appropriate thickness for its size, with edge clearances and patch fittings matched to the glass specification. Our article on structural glass covers the principles.

Installation order matters. The floor spring is set before the finished floor goes down and must be accurately aligned with the top pivot; errors of a few millimetres show up as a door that will not sit flat or close evenly. Most problems we see with pivot doors trace back to the substrate or the alignment rather than the hardware itself.

Frequently asked questions

Are pivot doors suitable as main entrance doors?

Yes, provided the hardware is rated for the leaf, the door is protected from direct weather, and the perimeter seals and locks are designed for a pivoting leaf. In apartment buildings, entrance doors may also need to meet fire-rating requirements, which will restrict the choice of door and hardware.

Can a pivot door be installed in an HDB flat?

It can be used for internal doors where space allows, but works that involve the floor slab, such as recessing a floor spring, and any change to the main entrance door are controlled. Where the main door is required to be fire-rated it must be replaced with an approved fire-rated door assembly, so check HDB’s renovation rules before planning one.

What is the difference between a centre-hung and an offset pivot door?

A centre-hung pivot door turns about an axis set in from the edge, so part of the leaf swings each way and the door can be double-acting. An offset pivot door turns about an axis near one edge and face, so it opens in one direction like a hinged door, but with its weight carried by the floor.

Why do pivot doors sag or drag over time?

The usual causes are hardware loaded beyond its rating, a bottom pivot set into a weak or uneven substrate, a top pivot fixed into a structure that flexes, or a leaf that has warped in humidity. Sizing the hardware with a margin and fixing it into sound structure prevents most of these problems.

Specifying a large pivot door and need the slab, header or fixings checked? Talk to our consultancy or get in touch.