A hospital never really closes. Rooms are occupied day and night, corridors stay lit, and the building is expected to work for decades with only partial shutdowns. The facade has to suit that life. It must keep out rain and uncontrolled air, admit useful daylight, resist the local wind and be cleaned, inspected and repaired while people inside carry on.
This guide looks only at the building envelope: walls, windows, glass and their joints. Clinical planning, internal finishes and building services are decided by other specialists. The aim here is to show which facade questions matter more on a healthcare project than on an ordinary office, so the brief and the review can address them early.
What makes a healthcare facade different
Three things stand out. Occupancy is continuous, so there is no weekend when a whole elevation can be emptied. Service life expectations are long, because rebuilding a wing is disruptive and expensive. And the people inside may be unwell, elderly or simply unable to move rooms easily, which raises the cost of any leak, draught or noisy repair.
These points do not call for exotic systems. They call for ordinary systems chosen and detailed with care: robust hardware, simple drainage paths, replaceable parts and a maintenance plan written before handover. A curtain wall at an entrance hall and punched casement windows in room blocks are common combinations, but the brief should explain why each zone gets the system it does.
Air and water tightness around the clock
Uncontrolled air infiltration through a facade makes rooms harder to keep comfortable and can carry dust and noise inside. On a healthcare project the building's indoor environment is designed by others, so the envelope's job is simple to state: be as tight as the specification requires and stay that way. Leakage usually happens at frame corners, opening sashes, perimeter gaps and poorly formed joints rather than through the glass.
Ask for evidence at two levels. Laboratory tests on a representative sample measure air leakage and water penetration under defined pressures; our testing page explains what each standard test measures. Site checks then confirm that installed work matches the tested sample. The article on air leakage in facades covers how those numbers are read.
Every sealant joint should be designed, not improvised. Joint width, backing and sealant type come from the movement expected and the substrates involved. A tidy bead applied over a dirty or wet surface can look correct on handover day and open within a few seasons, which on a ward block means a repair visit beside an occupied bed.
Windows people can and cannot open
Whether room windows open at all is a decision for the whole design team. The facade supplier's role is to deliver frames and hardware that do exactly what was agreed. Where windows open, many briefs ask for a limited opening for occupant safety, with a restrictor that cannot be released casually and a locking arrangement that staff can manage.
Casement windows are often chosen because a compression seal closes tightly and the opening can be controlled by hinges and stays. The weak point is usually the hardware rather than the frame. Specify stays, restrictors and handles for heavy daily use, confirm they are tested together with the sash weight, and ask how a worn part is replaced. The guide to window hardware lists the questions in more detail.
- Opening limit: agreed in writing and shown on the shop drawings for each window type.
- Restrictor: robust, tamper-resistant and released only by a deliberate action or tool.
- Seals: continuous around the sash, with mitred or moulded corners rather than gaps.
- Drainage: a clear path from the sill chamber to the outside that a cleaner cannot easily block.
Glass for rooms where people stay for long periods
Daylight and a view out are valued in rooms where people spend long hours, but so are privacy and control of glare and heat. Glass selection balances these. A tinted or reflective coating that solves heat gain on paper can make a room feel dim, while a clear unit on an exposed elevation may need external shading or a better coating to stay comfortable.
Safety glass is chosen by location and risk. Low-level panes, glazing beside doors and any glass that people might fall against are common places where the specification calls for toughened or laminated glass. Privacy at ground-floor rooms can be handled with patterned or treated glass, but check how it looks from outside at night and how it affects the room's daylight.
Think about replacement when choosing the glass, not only performance. An unusual coating, tint or size may be hard to match years later, leaving one odd pane in a uniform elevation. Keeping the number of glass types small across the building makes spares simpler to hold and repairs quicker to arrange. The guide on laminated or toughened glass explains how each behaves when it breaks.
Cleaning and inspection without disturbing occupants
If the only way to clean a window is from inside the room, every cleaning visit becomes an intrusion. Plan external access from the start: a building maintenance unit, roof anchors for rope access, a reachable podium, or windows designed to be cleaned safely from inside where external access is impractical. Each option affects the facade design, so it cannot be bolted on later.
Smooth, simple profiles collect less dirt than deep decorative grooves, and sills with a clear fall shed water and dust better than flat ledges. The article on designing a facade you can clean expands on this. Agree an inspection routine with the operator so that seals, drainage and fixings are checked on a cycle, not only after a complaint.
Replacing glass and seals in a live building
Sooner or later a pane will crack or a sealed unit will mist. In an office the room can be emptied for a day; in a ward block that may be difficult. Ask at design stage whether glass can be replaced from outside, how long one replacement takes, and whether temporary protection can keep the room usable while a unit is changed.
Keeping a small stock of spare glass for the most common sizes shortens the time a room stays boarded. Gaskets and hardware should be available from more than one source or recorded precisely enough to reorder. The guide on replacing damaged facade glass explains how to keep a replacement consistent with the original design.
Extensions and work next to occupied wings
Healthcare estates grow in phases, and new wings often join existing ones. The junction between an old facade and a new one deserves its own detail: different systems, different movement and sometimes different floor levels meet there. Survey the existing wall before designing the connection, and plan how the new work will be weathered at each stage so the occupied side stays dry.
Installation next to a live building needs extra care with noise, dust and site access. Sequence the work so that openings into occupied areas are closed quickly, temporary weather protection is ready before any existing panel is removed, and drilling into existing structure is agreed with the building's engineers. These are facade logistics, but they decide how disruptive the project feels to the people inside.
Consistency across phases also matters. A new wing built years after the first may use a newer profile range or a different glass supplier. Agree early whether it should match the existing elevation closely or read as a deliberate new layer, and record the original finishes so the comparison can be made on real samples rather than memory.
Mock-ups, tests and handover records
A mock-up of a typical room bay, including its opening window, sill and the wall around it, lets the team check restrictors, cleaning reach, drainage and appearance before production. Use it to agree finishes and to train the people who will install and maintain the work. Record what was approved so later batches can be compared with it.
At handover, the operator needs more than a warranty letter. Ask for as-built drawings, glass and gasket schedules, hardware data, cleaning instructions and an inspection plan. A hospital may outlive several maintenance contracts, and clear records are what let a future team repair a window without guessing what was installed.
General guidance for orientation, not a specification. Applicable standards, values and details are confirmed per project with the facade consultant.
