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Interior of a vehicle workshop: a pitched profiled steel roof on steel purlins, a roller-shutter door open to daylight, a vehicle lift and benches along the wall.

Building type

Workshops and garages: a cold roof over people who have to work under it.

A workshop is a small industrial building with a big door that opens all day. The roof drips in winter, the walls run cold, and the heating goes straight out through both. A sprayed layer on the roof underside and the inside of the walls stops the condensation and makes the space worth heating.

  • Steel, asbestos-cement or timber-framed roofs, clad walls
  • Roof and walls in one continuous layer
  • From £16/m² + VAT at 25 mm

Same-day estimator

About a minute · no obligation

Step 1 of 4: your building.

Which building is it?

Workshop is pre-selected. Change it if yours is different.

Takes about 30 seconds. No contact details yet.

01Why this building

Drips on the tools, cold walls at your back, heat out through everything.

Vehicles come in wet, engines run, people work, and the door opens for every job. All of that moisture rises to a steel or fibre-cement roof that is at outside temperature. It condenses, it drips onto bench tops and bonnets, and it rusts what it lands on. Meanwhile the heater you run all day is warming the car park through the sheet.

Looking up in an unheated workshop on a winter morning: condensation beading on the underside of a corrugated roof above a bench of tools and a car on a lift.
The roofBelow the dew point
  • Wet vehicles and running engines put a lot of moisture into a small volume.
  • The sheet and the walls are both at outside temperature.
  • Drips land on work, and rust what they land on.
Condensation, or a roof leak? Run the differential Three observations, about thirty seconds.

02Recent projects

Workshops HOLVEM has treated, roof and walls.

Photographs from HOLVEM's own workshop projects: roofs sprayed from beneath and walls sealed to bench height, with the workshop back in use afterwards. Every item carries the label it earns: Project record.

Inside a workshop after treatment: walls and roof sprayed in a continuous cream closed-cell layer, a timber floor and workbenches along the wall.
Project recordRoof and walls
Workshop, roof and walls sealedClosed cell, one continuous layer, benches back in place.
An MOT bay with its roof and upper walls sprayed in a cream closed-cell layer, vehicle lift and inspection equipment beneath.
Project recordMOT bay
MOT bay insulated from insideClosed cell above a working inspection bay.
Project recordWalls sealed
Walls sprayed in continuous passesClosed cell, from inside.
A steel portal-frame workshop interior with a pale lined roof and walls, a roller shutter and a scaffold tower during the works.
Project recordDuring the works
Portal-frame workshop during the worksAccess tower in, shutter side next.

All HOLVEM project records

03What is applied

Roof and walls as one continuous layer, meeting at the eaves.

The roof sheet stays as the weather line. The layer goes on from below in passes, then continues down the inside of the clad walls to the height agreed, so there is no cold gap at the eaves where warm air would find bare steel. Shutter surrounds, services and lights are masked and worked around. A small workshop is usually a few days' work.

Schematic / not to scaleKeyed 1 to 3 below

The same workshop after treatment: a continuous cream closed-cell layer on the roof underside running down the inside of the steel-clad wall to the bench height.
AppliedRoof into wall
The layer turns the corner at the eaves and runs down the wall. One continuous seal, not two products meeting.
1 / Roof underside

Profiled steel, corrugated, or asbestos-cement where it passes a condition survey. Sprayed from below, following the profile.

2 / Inside face of the walls

Steel cladding or blockwork, sprayed to the agreed height. Where the finish matters, a board lining can follow.

3 / The eaves junction

Roof and wall layers meet without a break. That junction is where a cold bridge would otherwise form.

Walls: metal-clad, stud and masonry

04Enverge NexSeal LE

The material we spray, and why it matters.

Enverge NexSeal LE is a two component closed cell polyurethane, spray applied directly onto the prepared substrate. As it cures, it expands and sets into one rigid, continuous layer, bonding into corrugations, laps, fixings and awkward junctions without being cut, jointed or mechanically fixed.

That matters because most insulation problems start at the gaps.

Board systems can leave voids at ribs, laps and junctions, and every gap is a potential cold bridge where warm internal air meets a cold surface and condensation forms, hidden behind the insulation. NexSeal LE is applied as one continuous bonded layer, so there is nowhere for that to start: a sealed, stable building envelope that controls condensation, reduces heat loss and protects the structure underneath.

0.027 W/mKThermal conductivity · aged · BS EN 14315-1
Class 1Surface spread of flame · BS 476-7 · uncoated
B-s2,d0Coated with DC315, as tested · BS EN 13501-1
25 yearsWorkmanship warranty, plus the manufacturer’s

HOLVEM also installs open-cell foam. It is a different product with its own data sheet, specified for different objectives: hybrid build-ups, sound, and where the layer has to breathe. Open-cell system data · Closed-cell system data

HOLVEM spray rig van with Enverge NexSeal LE A and B component drums plumbed into the proportioner.
HOLVEM rigA and B on board
The HOLVEM rig · Enverge NexSeal LE A and B components on board. HOLVEM's own photograph.

05Applications and problems

The elements a workshop puts in front of us, and the problems they bring.

Workshops are the most varied small buildings we treat: steel, corrugated or asbestos-cement roofs, clad or blockwork walls, timber-framed interiors. Each element has its own application page. The problems below are the ones workshop owners ring about.

The elements

The problems

06Depth

Four objectives. Each one sets the depth.

Start with what the building has to do; that decides the depth. Below is what each depth is for on this building. The survey confirms the right one, and the price follows from your area and access, never the other way round.

ObjectiveDepthWhat that depth is for here
Control condensation25 mmStops the drips onto benches and vehicles; the roof stays dry.
Retain heat50 mmMakes the workshop hold heat, so the heater is not warming the yard.
Reach a calculated U-value75 mm and aboveA figure to meet where the workshop is being brought up to a calculated standard.
Achieve Euroclass BDepth to suit + DC315 coatingWhere the fire strategy or insurer asks for a reaction-to-fire classification on the exposed face.

Prices are in the cost guide. A firm figure needs your building, and a coated system is always priced for the project. · Thickness and objective

Want a figure for your building? It takes about a minute.Building, structure, reading, details. A real figure for your building the same working day; nothing sent to anyone else.

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07The survey

Five things we check before anyone talks about depth.

A survey is one visit, from the workshop floor, fitted around the vehicles and the hours. Nothing comes off the roof and nothing stops. It gives us the five things a specification for this building has to stand on.

  1. Condensation, or a leak

    Where the water shows, when it shows and what your photographs say. Condensation and ingress look alike from the floor and need different answers.

  2. The roof sheet

    Profile, condition, fixings and coating, from below. Asbestos-cement passes a condition gate first.

  3. The walls

    Cladding or blockwork, the height to treat, and what is fixed to them.

  4. How the workshop runs

    Vehicles, hot work, heating and hours. They set the moisture load and the fire question.

  5. Access

    What can be moved, what is sheeted, and whether the work is a weekend or a closed bay.

What you get after the survey

Five things in writing, whether or not you go ahead.

  • A specificationWritten for this building, from what we found, with its assumptions named.
  • The depth, and whySet by the objective and confirmed by calculation for the element as built, bridges included.
  • The condensation-risk positionWhether anything will condense inside the build-up, to BS EN ISO 13788 with the BS 5250 climate.
  • The fire positionWhether your fire strategy calls for a classified surface, and the coated or uncoated build-up that answers it. Confirmed against the strategy, never assumed.
  • A firm priceFor your building, in writing. What moves it is explained in the cost guide.

Survey, or photographs?Send photographs of the roof

A firm figure starts with the building. Yours takes a minute to describe.Building, roof, what you are seeing, and how to reach you. A real figure for your building the same working day; nothing sent to anyone else.

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Project records

Work we have done on buildings like this.

All project records
Project recordTJW Grab Hire, BournemouthA 505 m² box-profile roof at 50 mm. The drips onto the lorries stopped.Read the record Project recordNuneaton Signs2924 m² encapsulated at 25 mm over weekends, with production untouched.Read the record

08Straight answers

Ask us the hard ones.

The questions workshop owners and garage operators actually ask on the call, answered the way the specialist answers them. A question we have not answered? Ask it on the call. No obligation.

How much does workshop insulation cost?
It depends on the depth, and the depth depends on what you are trying to fix. 25 mm is the condensation control specification and 50 mm retains useful heat as well. A small workshop costs more per square metre than a large shed because the area is small; walls are priced by area too. Send the building and we ring you the same working day with a real figure.
Can you do the walls as well as the roof?
Yes, and in a workshop we usually recommend it. The roof and wall layers meet at the eaves so there is no cold strip where condensation would otherwise start. Where you want a finished surface, a board lining can go over the wall layer.
Do we have to close the workshop?
Usually for the days the work takes, or bay by bay where the layout allows. Vehicles, tools and benches under the work are moved or sheeted. We agree the sequence with you before anyone arrives.
Our roof is asbestos-cement. Can you still do it?
Often, yes. The sheet passes a condition survey gate first. Where it passes, 50 mm closed-cell encapsulates it in place from below and the roof is retained. Where it fails, we tell you before anything is priced.
How do you prove it was installed correctly?
Applied thickness checked and recorded, coverage logged, all compiled into a QA evidence pack handed over at completion. You hold the evidence, not our word.

The next step

Your building.
Your brief.
A specialist.

If you already know the thickness or U-value you need, we price to it and confirm it is right; if not, we work it out with you. Tell us the workshop, the roof and what the drips land on; the estimator takes about a minute. “Not sure” is a useful starting point.

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Or call . Enquiries received before 3pm on a working day are contacted the same day. After 3pm, the next working day. A commitment to contact, not a quotation, a survey or a price.

Rather write it all down first? Start a project brief · about five minutes, photographs welcome.

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