Lamina Heat
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Wall and ceiling system · ComfortScrim

The most evenradiant heat we supply.

ComfortScrim goes behind the plaster on walls and ceilings alike, adding 2–3 mm to the build-up. It emits at 40–55 °C with 40–60% of its output arriving as infrared. That balance of a large surface at a moderate temperature is what makes it the most comfortable of the three systems.

Get a layout for your plan Technical downloads
A living room where the ceiling and the television wall glow as radiant heating surfaces
Element
ComfortScrim
Installed output
300–400 W/m²
Surface temperature
40–55 °C
Build-up
2–3 mm under plaster
Infrared proportion
40–60% of output
Time to felt warmth
10–30 min

How the system works

The same scrim, plastered into a wall or into a ceiling.

ComfortScrim is fitted behind plaster on walls and ceilings alike. It emits at 40–55 °C with 40–60% of its output delivered as infrared. That balance of a large surface at a moderate temperature is what makes it the most even and comfortable radiant heating we supply.

On the wall. A heated wall is something you can sit against. Fitted behind the plaster of the wall a sofa, a bed or a bench backs onto, it turns the coldest surface in the room into the most comfortable one, warm to lean on at a temperature you would never call hot. It is the usual answer for retrofit, heritage and protected structures, where there is nowhere to put a radiator and nothing may be seen.

On the ceiling. An unobstructed emitting plane with clear line of sight to everyone below, and no furniture, rug or cabinet standing in the way of it. Nothing on the floor or walls is disturbed, which makes it the least disruptive route into an occupied building.

Wall, with insulation

Where the fabric is being upgraded
Finishing paint Decoration as normal Plaster over the film 1–2 mm ComfortScrim Pressed into the base coat Plaster or gypsum base coat 1–2 mm Insulation board Where the construction calls for it Existing wall Made sound and primed Room side Structure

Wall, without insulation

Straight onto a sound existing wall
Finishing paint Decoration as normal Plaster over the film 1–2 mm ComfortScrim Pressed into the base coat Plaster or gypsum base coat 1–2 mm Existing wall Made sound and primed Room side Structure

Ceiling

On a plasterboard ceiling
Finishing paint Decoration as normal Plaster over the film 1–2 mm ComfortScrim Pressed into the base coat Plaster or gypsum base coat 1–2 mm Plasterboard Fixed to the ceiling grid Room side Above

The element is pressed into a wet 1–2 mm base coat and closed with a further 1–2 mm, so the two coats key through the perforations and bond to each other. Total added build-up: 2–3 mm.

The element unrolls straight onto the prepared wall. Copper bus bars along each edge, then plaster over the top, and from that moment it is completely invisible.
  1. Step 01

    Prepare the surface

    Substrate made sound and primed, insulation or backing board fixed where the construction calls for it.

  2. Step 02

    Lay the base coat

    A 1 to 2 mm base coat of plaster or gypsum goes on, ready to receive the element while it is still workable.

  3. Step 03

    Press in the scrim

    Pre-cut lengths pressed into the wet base coat to the layout drawing, bus bars aligned. The plaster keys through the perforations as it goes.

  4. Step 04

    Make the connections

    Bus bars connected to the zone wiring and back to the Multi Zone Power Supply, sensor set, resistance and insulation tests recorded.

  5. Step 05

    Plaster over the film

    A further 1 to 2 mm of plaster over the element, closing it into a single continuous coat.

  6. Step 06

    Paint the finish

    Finishing paint or decoration as normal. From here the wall or ceiling is just a wall or ceiling.

Why specify it

  • The most even heat

    40–60% of output arrives as infrared, from a large surface at a moderate temperature.

  • Adds 2–3 mm

    Behind the plaster on a wall or ceiling. The plaster keys straight through the perforated element.

  • 12–48 V DC

    Safe extra-low voltage. Runs from PV or battery on the same low-voltage bus.

  • Drill straight through it

    Because it is low voltage, holes up to 70 mm across can be made in the scrim without affecting how it works.

  • Wet rooms without a question

    Extra-low voltage makes bathrooms and wet rooms the normal case rather than the exception.

  • Fire resistant

    Tested as part of SafeTech. CE and TÜV certified, RoHS compliant.

  • Stops condensation

    Holding a cold external wall above dew point ends damp and mould at the source.

  • Fits the plastering sequence

    Pressed into the base coat by your plasterer, connected by your electrician. No special trade.

Buried and forgotten

A layer the building does not notice.

The element goes into the plaster and stays there for the life of the wall. Everything about how it is made is aimed at that: it should not change how the finish behaves, it should not make the wall fragile, and it should not stop anyone hanging a picture ten years later.

  • No shear plane, no cracking risk

    ComfortScrim is a webbed, perforated scrim rather than a solid sheet. The base coat and the top coat key through it and bond to each other, so the finish stays one continuous layer instead of two coats sandwiching a membrane.

  • Drill into it later

    Because the element runs at 12 to 48 V, holes up to 70 mm across can be made through the scrim without any danger to whoever is drilling and without stopping it working. Current routes around the opening through the surrounding web.

  • Made for wet rooms

    Safety extra-low voltage is what lets a heated surface go into a bathroom, a wet room or a shower wall at all. The element is water-immersion tested, and in these rooms it is the system we specify by default rather than by exception.

  • 20–30% of the room surface

    A wall and ceiling system typically covers a fifth to a third of the room surface area. The rest of the wall stays ordinary wall, which is what keeps the build-up, the cost and the electrical load down.

The system, together

Four parts, and only one of them ends up inside the wall.

ComfortScrim is not sold as a roll of film on its own. What arrives is a system: the element cut to your rooms, the thermostats that run each zone, the power supply that feeds them at safe voltage, and the drawings that tie the three together.

Rolls of ComfortScrim beside a Lamina Heat power supply unit and installation accessories
What ships: element cut to the drawing, power supply, thermostats and terminations.
  1. Element

    ComfortScrim

    Perforated carbon-fibre scrim, 0.4 mm thick, pre-cut to the layout drawing with copper bus bars along each edge.

  2. Control

    Room thermostat

    One per zone, wired at extra-low voltage. Room sensor, floor sensor or both, with scheduling.

  3. Supply

    Multi Zone Power Supply

    Isolates the mains and steps it down to 12–48 V. Up to five independently controlled zones from one wall-mounted unit.

  4. Circuit

    Consumer unit

    A single dedicated mains circuit and breaker. Nothing else changes in the building electrics.

System diagram showing the heating element, thermostat, power supply and consumer unit with their wiring runs
How the four parts connect.

The element itself

Element thickness0.4 mm
Widths600 and 900 mm
Roll lengthUp to 100 m, cut to the layout drawing
Operating voltage12–48 V AC/DC, safety extra-low voltage
Electricity to heat99.7% conversion
CertificationCE · TÜV · RoHS compliant

Full ComfortScrim datasheet →

Powering a low-voltage system

Transparent render of the LaminaHeat Multi Zone Power Supply showing the toroidal transformer, control board and breaker
LaminaHeat Multi Zone Power Supply. Isolated toroidal core, MCU control board, output fuses and breaker in one wall-mounted enclosure.

The LaminaHeat Multi Zone Power Supply.

A wall or ceiling element runs at 12 to 48 volts. That is the reason it can be plastered into a bathroom wall and forgotten. The Multi Zone Power Supply is the unit that makes it possible: it takes ordinary mains, isolates it, steps it down to the element's voltage and runs each room as its own zone.

  • Up to five zones from one unit

    Each zone has its own thermostat and its own protected output. One unit heats several rooms, each on its own schedule.

  • Sized to the project, up to 6000 W

    Units are specified against the layout drawing, from a single room to a whole floor of an apartment or office.

  • 110 to 240 V in, 12 to 48 V out

    Universal mains input. Output voltage is chosen to suit the element and the run lengths, with 12, 24, 36 and 48 V all standard.

  • Safety extra-low voltage

    An isolated toroidal transformer keeps the heated surface at SELV. That is what makes an element you can plaster into a wall or a wet room.

  • Protection that resets itself

    Over-voltage, over-temperature and overload are each cut and shown on the panel. Every output carries its own fuse, and faults restart automatically once cleared.

  • Quiet, efficient, PV-ready

    Soft-start control, around 96% efficiency and no fan. A DC input from PV or battery is available for off-grid and solar-first buildings.

Zones
1–5 per unit
Output
Up to 6000 W
Input
110–240 V AC · PV / battery DC option
Output voltage
12 · 24 · 36 · 48 V
Certification
CE
Warranty
5 years
Power supply datasheet (PDF) Size one for my project

Reference pictures

Photographs from completed projects.
  • An installer unrolling a length of ComfortScrim down a wall
    Unrolled straight down the wall, office building
  • An installer smoothing a length of ComfortScrim onto a wall
    Smoothed into the base coat
  • Two installers fitting a length of ComfortScrim to a wall
    Two-hand work on a full-height wall
  • A plasterer skimming over ComfortScrim on a wall
    Plaster going over the element
  • A plasterer skimming over ComfortScrim on an old European wall
    Skimmed over on an old wall
  • An installer rolling out ComfortScrim across a ceiling
    Rolled out across a ceiling
  • Bays of ComfortScrim fitted across a ceiling before the finish
    Bays set out across the ceiling
  • A ceiling with ComfortScrim fitted around downlight positions
    Routed around the downlights
  • Three bays of ComfortScrim fitted to the old wall of a German winery
    Three bays fitted, old winery in Detzem, Germany
  • A plasterer skimming over ComfortScrim on the wall of a German house
    Plastered straight over by the painter, Detzem
  • ComfortScrim fitted to an old wall between exposed timber beams
    Fitted between exposed beams, heritage building
  • ComfortScrim on the walls of a heritage room before plastering
    Heritage room, walls covered before plaster
  • The wall-mounted power supply and OJ Electronics thermostat of a ComfortScrim system
    Power supply and thermostat, the only visible parts
  • FLIR thermal image of wall elements glowing evenly behind a finished wall
    Through the thermal camera: elements behind the finish
  • A finished living room with no visible heating
    Finished living room. Nothing to see.
  • The finished living and dining room of the German winery, with no visible heating
    Finished. 36 m² living and dining room, Detzem
  • A busy craft-beer bar heated by wall elements behind the plaster
    Craft-beer bar, Qingdao. Heated from the walls.

From the people who live with it

“We do not need hot air to feel comfortable.”
Reiner Duchene · Old winery, Detzem, Germany

Specification

ElementComfortScrim
SurfacesWall and ceiling
Voltage12–48 V DC
Build-up2–3 mm under plaster
Installed output300–400 W/m²
Surface temperature40–55 °C
Infrared proportion40–60% of output
Time to felt warmth10–30 min
Surface coverageTypically 20–30% of the room surface area
CertificationCE, TÜV, RoHS compliant
Warranty10 years product · 20-year tested life

Technical downloads

Need a document that is not listed? Ask usand we will send it directly.

Questions we get asked

Can I hang things on a heated wall?

Yes. Because the system runs at safety extra-low voltage, holes up to 70 mm across can be made through the scrim without affecting how it works and without any danger to whoever is drilling. Fix where you need to.

What happens if someone drills into the film years later?

Nothing dramatic. A drill through a 12–48 V element does not present a shock hazard, and a hole up to 70 mm across does not stop the element working: current simply routes around it through the surrounding web. If a larger opening is cut, or an element is severed edge to edge, that zone is repaired with a splice kit and re-tested.

Is the electrical side safe in a wall I cannot see into?

The element never carries mains. The LaminaHeat Multi Zone Power Supply isolates the mains supply through a toroidal transformer and feeds the wall at 12 to 48 V, which is safety extra-low voltage. Every zone is protected and fused at the supply, and resistance and insulation tests are recorded before anything is covered.

Is there any harm from the radiation the elements give off?

No. The elements emit far-infrared at 6 to 15 µm, the same band your own body radiates at. It is absorbed in the outermost fraction of a millimetre of skin rather than passing into the body, it is not ionising, and it is not visible. It is the same mechanism as warmth from a stone wall that has been in the sun.

Wall or ceiling, which should I choose?

The ceiling if the room has furniture against most of its walls, or if the walls cannot be disturbed. The wall where you want a warm surface people can sit or lean against. In many projects we specify both.

Does a plaster finish affect the output?

The finish thickness is part of the calculation. Tell us the plaster system at design stage and the layout is sized against it. Gypsum, lime and render all behave differently and all of them work.

Energy use, estimated

How much energy this surface actually uses.

A radiant surface does not run continuously. It cycles under the thermostat, and the share of time it is on is set by how well the building holds heat. Tell us the standard the building was built or renovated to and how big the space is.

Building standard
Days per year the heating is in use. Shorter in mild coastal climates, longer inland and at altitude.
24/7 temperature control kWh per season kWh per day Held at temperature around the clock, cycling under the thermostat
Smart use, 10 h/day kWh per season kWh per day Heated only through the hours the rooms are occupied
Installed power
W/m² of room · kW
On, cycling
of the time
Element on the surface
W/m² over of the
Per m² per season
kWh/m² at 24/7 · kWh/m² at 10 h/day

±10% tolerance. Climate, exposure, glazing, ventilation rate and how the building is actually used all move the number.

How this is calculated

Energy = area × installed W/m² × hours per day × duty cycle × days in the season. The only difference between the two figures is the hours: 24 for continuous temperature control, 10 for smart use through the occupied hours.

  • Passive or near-passive (Passivhaus · KfW 40 · EPC A · very high performance): 30 W/m² installed, on 15% of the time.
  • New build to current standard (GEG · KfW 55 · Part L 2021 · EPC B): 50 W/m² installed, on 20% of the time.
  • Modernised (EnEV 2002–2016 · EPC C · insulated retrofit): 75 W/m² installed, on 25% of the time.
  • Partly modernised (WSchV 1984–1995 · EPC D · some insulation): 100 W/m² installed, on 30% of the time.
  • Unmodernised (Pre-1978, before WSchV 1977 · EPC E–G · solid wall): 120 W/m² installed, on 35% of the time.

Element density = installed W/m² ÷ coverage. Wall and ceiling (ComfortScrim): 15–30% of the surface, 22% assumed.

Indicative only. Your project's figures come out of the heat-loss calculation and the layout drawing.

Get a layout with these figures

The other surfaces

Floor heating system

Floor heating

Large open spaces where warm feet are wanted, rooms with ceilings above three metres, and buildings heated around the clock. The largest emitting area at the lowest surface temperature.

See the system Ceiling panel system · PowerBoard

Ceiling panels

PowerBoard 250 where a suspended plasterboard ceiling is going in. PowerBoard 500 and 750 for open offices and home renovations that need fast mounting with no construction work.

See the system

Send us a floor plan.We will send back a heating system.

Project data, drawings or CAD files in. A room-by-room heat loss, element layout and priced proposal out. No obligation.

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