Surfaces & Finishes

A clinical surface has to satisfy three demands at once, and the interior designer's skill is meeting all three without surrendering warmth. The first is cleanability. A surface must be non-porous and smooth so that it can be wiped, washed and disinfected quickly and completely, and so that blood, body fluids and spills sit on top to be removed rather than soaking in. Porous, textured or absorbent materials - untreated timber, fabric, rough grout, worn or cracked surfaces - hold moisture and organic matter and become reservoirs for microorganisms. Cleanability also means the surface can survive the cleaning itself: hospitals disinfect constantly, often with harsh chemicals, so a finish that degrades, discolours or crazes under repeated disinfection has effectively failed.

The second demand is durability. A hospital is punishing: beds, trolleys, wheelchairs and equipment batter walls, doors, corners and floors around the clock, for decades. A damaged surface is not merely ugly - a gouge, crack, chip or worn patch creates exactly the crevice that defeats cleaning and harbours infection. So durability is not vanity; it is hygiene over time. This is why hospitals are full of impact protection: crash rails, corner guards, door and wall protection, kick plates - all placed where the daily collisions actually happen.

The third demand is seamlessness. Joints, seams, gaps and crevices are where dirt and pathogens hide from the cloth, so the governing instinct is to eliminate them wherever the risk is highest. Sheet flooring is welded into a continuous membrane rather than laid as tiles with grout lines; worktops are formed with integral, coved upstands so there is no joint between counter and wall; wall sheets are sealed; penetrations are minimised and sealed. In the most critical spaces - theatres, some isolation and clean rooms - the aim approaches the seamless, washable envelope of a cleanroom. Elsewhere the standard relaxes, because not every corridor needs theatre-grade surfaces. Matching the specification to the risk of each space - rather than over- or under-building everywhere - is the heart of good, economical finishes design.

In healthcare interiors, the infection-control performance lives in the junctions far more than in the flat middle of any surface, which is why detailing is where the interior designer earns their keep. Consider the most famous example: the floor-to-wall junction. A conventional square junction with a separate skirting board creates a right-angled crevice at floor level - precisely where mops push dirt and water - that cannot be cleaned in a single stroke and that traps moisture and grime. The healthcare answer is a coved (curved) junction: the flooring sweeps up the wall in a smooth concave curve, leaving no corner for dirt to lodge and letting a mop or machine clean floor and skirting in one continuous pass. One small section detail removes a whole category of reservoir.

The same thinking runs through every element. Floors in clinical areas are typically continuous welded sheet materials - so there are no grout lines - chosen also for slip resistance (falls are a major patient-safety issue) and comfort underfoot for staff who stand all day. Walls may carry sealed sheet finishes or durable coatings in wet and high-risk areas, with integral protection. Ceilings in critical spaces are sealed and washable rather than open tile grids that shed particles; elsewhere, accessible tiles are accepted where the hygiene demand is lower. Worktops get integral coved upstands and sealed sink junctions. Doors, frames, ironmongery and vision panels are detailed to be wiped down and to survive constant traffic. Everywhere, penetrations - for pipes, sockets, rails, medical-gas outlets - are minimised and sealed, because every hole is a potential crevice.

The lesson is that in a hospital you cannot separate the 'design' from the 'detail'. A beautiful material specified with a careless junction is an infection risk; a modest material detailed with coved junctions, welded seams and sealed penetrations performs. The interior designer's drawings - the section through a skirting, the junction at a worktop, the seal around an outlet - are clinical documents, and they are where infection control is either won or quietly lost.

A seductive idea in healthcare products is the antimicrobial surface - a finish, coating or additive marketed as killing or resisting microbes, so the surface 'helps' control infection on its own. It is worth being clear-eyed here, because this is where marketing most outruns evidence. Some materials do have genuine inherent antimicrobial properties - notably copper and certain copper alloys, which research has shown can reduce microbial contamination on frequently-touched surfaces. But many 'antimicrobial' coatings and additives have limited, contested or unproven benefit in real clinical use, and none of them remove the need for the basics.

The honest principle is this: an antimicrobial claim is never a substitute for a surface that is cleanable, intact and actually cleaned. The fundamentals - non-porous, seamless, durable, well-detailed surfaces plus rigorous routine cleaning and disinfection - do the real work of infection control. An antimicrobial property, where it is genuinely evidenced, may be a useful additional layer on high-touch items, but a surface that is hard to clean is dangerous no matter what it is coated with, and a cleanable surface that is diligently cleaned is safe whether or not it is 'antimicrobial'. Treat such products as claims to verify - against independent evidence, the manufacturer's tested data, and the infection-control team - not as a shortcut.

There is a practical design corollary. Rather than chasing a magic surface, reduce the number of things that must be touched and cleaned at all: specify hands-free fittings where they help (sensor taps, automatic or foot-operated doors and bins in the right places), minimise clutter and ledges that collect dust, and make high-touch points - handrails, door furniture, bed controls - easy to reach and easy to wipe. Good infection-control finishes design is less about a miraculous material and more about a disciplined, well-detailed, cleanable environment with fewer hiding places - the unglamorous fundamentals, done rigorously.

If the module stopped at cleanability it would produce safe hospitals that feel like laboratories - and that, as the whole course insists, is its own kind of failure. The hardest and most valuable skill of the healthcare interior designer is delivering all the clinical performance above while creating an environment that actually helps people heal. The evidence for healing environments (Module 6.2) is as real as the evidence for infection control: daylight, views, nature, calming colour, controlled noise and materials that feel humane rather than institutional measurably support recovery, reduce stress and improve the experience of patients, families and staff.

The false belief to reject is that hygiene and humanity are opposed - that a cleanable hospital must be a cold, hard, white one. They are not opposed; they are a design problem to be solved together. Warm colours can be delivered in wipeable, durable finishes. The feeling of natural materials can be achieved with high-quality, cleanable surfaces that evoke timber or stone without the porosity of the real thing in the wrong place. Soft, homely touches can be introduced where the infection risk allows - a family area, an outpatient waiting room, a paediatric ward - and kept clinical where it must be, such as a theatre or an ICU bed space. The craft is knowing the infection-control demand of each space precisely, and then spending every gram of design freedom that remains on warmth, dignity and calm.

This is why the interior designer's role in a hospital is a higher calling than decoration, and why it sits at the centre of this module. You hold two duties that look opposed and are not: to deny infection a single hiding place, and to give a frightened human being a place that feels cared-for. Do only the first and you build a safe, bleak machine; do only the second and you build a dangerous, pretty one. The best healthcare interiors do both at once - cleanable, durable, seamless and humane - and the patient, who may never notice a coved skirting or a welded seam, heals better for all of it.