What to Order for Your Van: Insulation & Lining Calculator

If you are planning a campervan conversion, one of the first questions is usually:

How much insulation do I actually need for my van?

And shortly afterwards:

How much lining carpet should I order?

Getting the quantities right matters. Order too little and the project stops halfway through. Order too much and you are left with material you may never use.

The amount you need depends mainly on your van model, wheelbase, roof height, number of windows and how extensively you plan to insulate and line the interior.

A VW Caddy requires considerably less material than a Fiat Ducato L4H2, Mercedes-Benz Sprinter LWB or Ford Transit L4H3.

To make planning easier, we have put together practical material estimates for many of the most popular European vans.

A complete Eaglefelt campervan insulation and lining system can be divided into four main layers:

If you want to understand why these materials are used and how the different layers work together, read our Complete Camper Van Insulation Guide.

What to Order for Your Van: Insulation & Lining Calculator

Not sure how many metres of insulation or lining carpet to put in your basket?

The table below converts general coverage estimates into practical Eaglefelt order quantities for many popular campervan platforms.

The recommendations are based on a typical campervan conversion covering the main walls, roof, doors and cavities.

Every conversion is different, so use these quantities as a practical starting point rather than an exact vehicle specification.

Recommended Eaglefelt Materials by Van Model

Van model	Premium Sound Blocker 2.0 mm	Termoflex 10 mm	Termo Wool 50 mm	4-Way Stretch Lining Carpet	Trim Adhesive*
VW Caddy / Caddy Maxi	2–4 m	6–8 m	1 × 7 m roll / 5.25 m²	5–8 m	5–8 cans
Ford Transit Connect	2–4 m	6–8 m	1 × 7 m roll / 5.25 m²	5–8 m	5–8 cans
Citroën Berlingo / Peugeot Partner	2–4 m	6–8 m	1 × 7 m roll / 5.25 m²	5–8 m	5–8 cans
VW Transporter T5/T6/T6.1 SWB	4–6 m	10–12 m	1 × 14 m roll / 10.5 m²	10–12 m	10–12 cans
VW Transporter T5/T6/T6.1 LWB	4–6 m	14–16 m	1 × 14 m roll / 10.5 m²	12–15 m	12–15 cans
Ford Transit Custom SWB	4–6 m	10–12 m	1 × 14 m roll / 10.5 m²	10–12 m	10–12 cans
Ford Transit Custom LWB	4–6 m	14–16 m	1 × 14 m roll / 10.5 m²	12–15 m	12–15 cans
Renault Trafic / Opel Vivaro SWB	4–6 m	10–12 m	1 × 14 m roll / 10.5 m²	10–12 m	10–12 cans
Renault Trafic / Opel Vivaro LWB	4–6 m	14–16 m	1 × 14 m roll / 10.5 m²	12–15 m	12–15 cans
Mercedes-Benz Vito SWB / MWB	4–6 m	10–14 m	1 × 14 m roll / 10.5 m²	10–14 m	10–14 cans
Fiat Ducato / Peugeot Boxer / Citroën Jumper L2H2	6–8 m	16–20 m	1 × 14 m + 1 × 7 m roll / 15.75 m²	13–16 m	13–16 cans
Fiat Ducato / Peugeot Boxer / Citroën Jumper L3H2	6–8 m	20–24 m	1 × 14 m + 1 × 7 m roll / 15.75 m²	15–18 m	15–18 cans
Fiat Ducato / Peugeot Boxer / Citroën Jumper L4H2	8–10 m	24–28 m	2 × 14 m rolls / 21 m²	18–20 m	18–20 cans
Mercedes-Benz Sprinter MWB	6–8 m	16–20 m	1 × 14 m + 1 × 7 m roll / 15.75 m²	13–16 m	13–16 cans
Mercedes-Benz Sprinter LWB	6–8 m	20–24 m	1 × 14 m + 1 × 7 m roll / 15.75 m²	15–18 m	15–18 cans
Mercedes-Benz Sprinter XLWB	8–10 m	24–30 m	2 × 14 m rolls / 21 m²	18–22 m	18–22 cans
VW Crafter MWB	6–8 m	16–20 m	1 × 14 m + 1 × 7 m roll / 15.75 m²	13–16 m	13–16 cans
VW Crafter LWB / Maxi	8–10 m	22–28 m	2 × 14 m rolls / 21 m²	17–21 m	17–21 cans
Ford Transit L2H2	6–8 m	16–20 m	1 × 14 m + 1 × 7 m roll / 15.75 m²	13–16 m	13–16 cans
Ford Transit L3H2	6–8 m	20–24 m	1 × 14 m + 1 × 7 m roll / 15.75 m²	15–18 m	15–18 cans
Ford Transit L4H3	8–10 m	24–30 m	2 × 14 m rolls / 21 m²	18–22 m	18–22 cans
Renault Master L2H2	6–8 m	16–20 m	1 × 14 m + 1 × 7 m roll / 15.75 m²	13–16 m	13–16 cans
Renault Master L3H2	6–8 m	20–24 m	1 × 14 m + 1 × 7 m roll / 15.75 m²	15–18 m	15–18 cans
Renault Master L4H3	8–10 m	24–30 m	2 × 14 m rolls / 21 m²	18–22 m	18–22 cans

*Adhesive quantities are primarily a working guide for installing the lining carpet. If you also use adhesive to install non-self-adhesive Termoflex or other materials, allow additional adhesive.

Important: These quantities are approximate. Van dimensions vary between model years and specifications, while windows, doors, roof vents, furniture and your chosen installation method will affect the final requirement.

For most projects, allowing around 10% extra material for cutting, fitting and unavoidable waste is a sensible precaution.

Why Do I Need Different Types of Van Insulation?

One of the biggest mistakes in campervan insulation is expecting a single material to do everything.

Sound deadening, condensation control and thermal insulation perform different jobs.

A well-designed campervan insulation system uses several materials together:

Van body → Sound deadening → Closed-cell foam → Thermal insulation → Interior lining

At Eaglefelt, we recommend approaching the conversion as a complete system rather than simply filling every cavity with one type of insulation.

Step 1: Premium Sound Blocker – Control Panel Vibration

An empty van is essentially a large metal shell.

Large sheet-metal panels can vibrate and resonate as you drive, amplifying tyre noise, road vibration and the familiar hollow sound of an unconverted panel van.

The first layer is therefore sound deadening.

Eaglefelt Premium Sound Blocker is a butyl-based vibration damping material designed for vehicle body panels.

For most campervan conversions, Premium Sound Blocker 2.0 mm is an excellent starting point for:

large side panels
sliding doors
rear doors
bulkheads
other large resonant metal surfaces

How Much Sound Deadening Do I Need?

The important point is that sound deadening does not require the same coverage as thermal insulation.

You do not normally need to cover every square centimetre of the van with butyl.

Strategic placement on the large panels that actually resonate is much more efficient and avoids adding unnecessary weight.

For a medium-sized van such as a VW Transporter, Ford Transit Custom or Renault Trafic, approximately 2–3 m² is a useful planning figure.

Large panel vans will typically require around 3–5 m², depending on the level of sound treatment you want.

Premium Sound Blocker 2.0 mm is supplied from a 500 mm wide continuous roll and sold by the metre.

That means:

2 metres = 1 m²
4 metres = 2 m²
6 metres = 3 m²
8 metres = 4 m²
10 metres = 5 m²

Shop Premium Sound Blocker →

Step 2: Termoflex – Condensation Control and Thermal Break

Once the main resonant panels have been treated, the next challenge is condensation.

A campervan is a metal structure, and metal reacts quickly to changes in outside temperature.

When warm, moisture-laden interior air meets cold steel, condensation can form on the inside of the vehicle body.

Sleeping, breathing, cooking, drying wet clothes and simply spending time inside the van all increase humidity.

This makes the insulation layer directly against the vehicle body particularly important.

Eaglefelt Termoflex Thermo-Acoustic Foam is a flexible closed-cell insulation designed for thermal and acoustic insulation in campervans and panel vans.

Its closed-cell structure resists moisture and helps:

reduce cold bridging
reduce heat transfer through the vehicle body
reduce the risk of condensation on cold metal surfaces
improve acoustic comfort
create a continuous insulation layer before the cavities are filled

Why Termoflex 10 mm?

For many conversions, Termoflex 10 mm provides a good balance between insulation performance and installation thickness.

Termoflex is approximately 1 metre wide, which makes calculating the required quantity straightforward.

As a simple guide:

10 metres ≈ 10 m²
15 metres ≈ 15 m²
20 metres ≈ 20 m²
25 metres ≈ 25 m²

This is why a medium SWB van may require around 10–12 metres while a large LWB panel van can easily require 20–24 metres.

Shop Termoflex Closed-Cell Insulation →

Prefer Self-Adhesive Insulation?

For faster installation, Eaglefelt also offers the self-adhesive Termoflex XF range.

Termoflex XF 6 mm is particularly useful for pillars, ribs, doors and areas where installation space is restricted.

Termoflex XF 13 mm is an excellent all-round option for walls, roofs and larger body panels.

Termoflex XF 19 mm provides a thicker insulation layer where maximum thermal performance is the priority and sufficient installation depth is available.

You do not necessarily need to use the same thickness throughout the van.

For example, a conversion can use 13 or 19 mm on large open wall and roof areas, with 6 mm over ribs, pillars and tighter sections.

Compare all Termoflex insulation options →

Step 3: Termo Wool 50 mm – Fill the Cavities

After creating the closed-cell insulation layer, the larger wall and roof cavities can be filled with thermal insulation.

Eaglefelt Termo Wool is a flexible polyester thermal insulation designed for campervans, cargo vans and motorhome conversions.

It is lightweight, flexible and easy to cut, making it particularly useful for the irregular cavities found inside vans.

Typical applications include:

wall cavities
roof cavities
rear quarter panels
larger door cavities
structural voids
other spaces behind interior panels

Why We Recommend Termo Wool 50 mm

For the main thermal fill layer, we recommend 50 mm Termo Wool wherever the available cavity depth allows it.

The thicker material fills deeper wall and roof cavities effectively without requiring multiple thin layers.

Eaglefelt offers two useful 50 mm roll sizes:

Termo Wool 50 mm – 7 m roll
Coverage: 5.25 m²

Termo Wool 50 mm – 14 m roll
Coverage: 10.5 m²

For many medium vans, one 14 m roll provides a practical starting point.

For large panel vans such as a Ducato, Boxer, Relay, Sprinter, Crafter, Transit or Master, combining a 14 m roll and 7 m roll provides 15.75 m².

For XL conversions, two 14 m rolls provide 21 m².

When Should I Use Termo Wool 30 mm?

Not every part of a van has enough space for 50 mm insulation.

This is where Termo Wool 30 mm becomes useful.

Use the 30 mm version in:

shallower doors
narrow cavities
areas behind trim panels
restricted spaces where 50 mm would need to be excessively compressed

In many conversions, using both 50 mm and 30 mm Termo Wool is better than trying to use one thickness everywhere.

Avoid unnecessarily compressing polyester insulation. Its thermal performance relies partly on the air trapped within the fibre structure.

Shop Termo Wool Thermal Insulation →

Step 4: Finish with Eaglefelt 4-Way Stretch Lining Carpet

Once the insulation is complete and the interior panels are ready, the final stage is the visible finish.

Eaglefelt 4-Way Stretch Lining Carpet is designed specifically for campervan and vehicle interiors.

Its ability to stretch in four directions makes a significant difference when working around:

wheel arches
window recesses
pillars
door frames
roof panels
curved plywood panels
complex corners

Instead of fighting against the material, it can be stretched and shaped around the contours of the vehicle.

This makes 4-way stretch lining suitable for both first-time DIY builders and professional converters looking for a clean, professional finish.

Shop Eaglefelt 4-Way Stretch Lining Carpet →

How Much Lining Carpet Do I Need for My Van?

This is one of the easiest materials to underestimate.

You cannot simply calculate the visible surface area of the van.

Lining carpet also requires material for:

wrapping edges
stretching around curves
window apertures
wheel arches
pillars
door openings
panel edges
cutting and trimming

For Eaglefelt’s 2 metre wide lining carpet, use the following as a practical guide:

Small vans: 5–8 linear metres
Medium SWB vans: 10–12 linear metres
Medium LWB vans: 12–15 linear metres
Large panel vans: 13–18 linear metres
XL vans: 18–22 linear metres

For example:

VW Transporter T5/T6/T6.1 SWB: approximately 10–12 linear metres

VW Transporter LWB: approximately 12–15 linear metres

Fiat Ducato / Peugeot Boxer / Citroën Relay L3H2: approximately 15–18 linear metres

Mercedes-Benz Sprinter LWB: approximately 15–18 linear metres

Linear Metres vs Square Metres

This causes a surprising amount of confusion when ordering van lining carpet.

Insulation is normally calculated in square metres (m²).

Lining carpet is commonly ordered in linear metres (lm).

Because Eaglefelt lining carpet is 2 metres wide:

Linear metres	Material area
5 lm	10 m²
8 lm	16 m²
10 lm	20 m²
12 lm	24 m²
15 lm	30 m²
18 lm	36 m²
20 lm	40 m²

So 10 linear metres gives you 20 m² of material, while 15 linear metres gives you 30 m².

However, 30 m² of carpet does not necessarily mean exactly 30 m² of finished interior coverage.

Cutting direction, stretching, wrapping and offcuts all affect the usable area.

Don’t Forget the Adhesive

A good lining material still needs the right adhesive.

Vehicle interiors can become extremely hot in direct sunlight, particularly around the roof and upper body panels. A suitable high-temperature adhesive is therefore important.

A practical working guide for lining carpet is approximately:

1 can of Eaglefelt Trim Spray Adhesive per 1 linear metre of lining carpet.

Lining carpet	Approx. adhesive
5 m	5 cans
8 m	8 cans
10 m	10 cans
12 m	12 cans
15 m	15 cans
18 m	18 cans
20 m	20 cans

For complete conversions, the Eaglefelt Trim Spray Adhesive 12-Pack can be more convenient than ordering individual cans.

For larger vans, combine a 12-pack with additional Eaglefelt Trim Spray Adhesive as required.

If you are also installing non-self-adhesive Termoflex with spray adhesive, remember to allow additional adhesive for the insulation.

Example Shopping List: VW Transporter T5/T6/T6.1 SWB

For a typical VW Transporter SWB camper conversion, a practical Eaglefelt shopping list would be:

4–6 metres of Premium Sound Blocker 2.0 mm

10–12 metres of Termoflex 10 mm

1 × 14 metre roll of Termo Wool 50 mm, providing 10.5 m²

10–12 metres of Eaglefelt 4-Way Stretch Lining Carpet

Approximately 10–12 cans of Eaglefelt Trim Spray Adhesive

Where the full 50 mm depth is not available, use Termo Wool 30 mm in the shallower areas instead of compressing the 50 mm material excessively.

Example Shopping List: VW Transporter T5/T6/T6.1 LWB

For a LWB Transporter, start with approximately:

4–6 metres of Premium Sound Blocker 2.0 mm

14–16 metres of Termoflex 10 mm

1 × 14 metre roll of Termo Wool 50 mm

12–15 metres of Eaglefelt 4-Way Stretch Lining Carpet

Approximately 12–15 cans of Trim Spray Adhesive

This also provides a useful reference point for similarly sized medium LWB vans such as the Ford Transit Custom, Renault Trafic and Vauxhall Vivaro.

Example Shopping List: Fiat Ducato L3H2 / Peugeot Boxer / Citroën Relay

For a typical full-size Fiat Ducato L3H2, Peugeot Boxer or Citroën Relay camper conversion, start with approximately:

6–8 metres of Premium Sound Blocker 2.0 mm

20–24 metres of Termoflex 10 mm

1 × 14 metre + 1 × 7 metre roll of Termo Wool 50 mm, providing approximately 15.75 m²

15–18 metres of 4-Way Stretch Lining Carpet

Approximately 15–18 cans of Eaglefelt Trim Spray Adhesive

For a conversion intended for colder conditions or year-round use, you can also consider upgrading suitable wall and roof areas to Termoflex XF 13 mm or Termoflex XF 19 mm, depending on the available space.

Example Shopping List: Mercedes-Benz Sprinter LWB

For a typical Mercedes-Benz Sprinter LWB campervan conversion, start with approximately:

6–8 metres of Premium Sound Blocker 2.0 mm

20–24 metres of Termoflex 10 mm

1 × 14 metre + 1 × 7 metre roll of Termo Wool 50 mm, providing approximately 15.75 m²

15–18 metres of Eaglefelt 4-Way Stretch Lining Carpet

Approximately 15–18 cans of Trim Spray Adhesive

For an XLWB Sprinter or similarly large VW Crafter, Ford Transit or Renault Master, increase Termoflex towards 24–30 metres, lining carpet towards 18–22 metres, and consider two 14 m rolls of Termo Wool 50 mm for up to 21 m² of thermal fill.

Does a Van with Windows Need Less Insulation?

Usually, yes.

A fully glazed passenger van has less exposed metal wall area than an equivalent panel van.

However, the difference is not always as large as expected.

Windows create additional edges, recesses and trim areas, and you still need insulation and lining around them.

Unless your van has extensive factory glazing, we recommend using the figures in the table as a planning guide rather than trying to deduct the exact area of every window.

Do I Need to Insulate the Roof?

Yes, particularly if you are building a campervan for overnight or year-round use.

The roof is one of the most important areas to insulate.

During summer, direct sunlight can heat a metal van roof dramatically. In colder conditions, warm air inside the vehicle rises towards the ceiling, making an inadequately insulated roof an obvious source of heat loss.

The roof can also be an important area for condensation control.

For a full campervan conversion, include the roof when calculating both Termoflex closed-cell insulation and Termo Wool thermal insulation.

Should I Add Extra Material for Waste?

Yes.

For most DIY campervan conversions, allowing approximately 10% extra material is a sensible approach.

Vans contain a lot of awkward shapes. Wheel arches, door frames, roof transitions, ribs, pillars and corners all produce offcuts.

This is especially important with lining carpet.

Having enough material to position, stretch and trim a section correctly is much easier than trying to make an undersized offcut fit.

It is usually better to finish the conversion with a small amount left over than to discover you are one metre short halfway through the final panel.

What Is the Best Insulation System for a Campervan?

There is no single insulation material that performs every job equally well.

The most effective approach is a layered system where each material has a clear purpose.

Layer 1 – Sound Control

Use Eaglefelt Premium Sound Blocker strategically on resonant sheet-metal panels.

Layer 2 – Condensation Control and Thermal Break

Use Eaglefelt Termoflex closed-cell foam against the vehicle body to reduce cold bridging and create the first thermal layer.

Layer 3 – Thermal Insulation

Fill the main wall and roof cavities with Eaglefelt Termo Wool 50 mm wherever the available depth allows it.

Use Termo Wool 30 mm in shallower cavities and restricted spaces.

Layer 4 – Interior Finish

Complete the interior with Eaglefelt 4-Way Stretch Lining Carpet for a flexible and professional finish.

Each layer solves a different problem.

Adding more of one material does not necessarily replace the function of another.

Frequently Asked Questions

How many square metres of insulation do I need for a campervan?

A small van may require around 6–8 m² of closed-cell insulation, while a medium campervan commonly requires around 10–16 m². Large panel vans can require approximately 20–30 m² depending on wheelbase, roof height and how extensively the vehicle is insulated.

How much insulation do I need for a VW Transporter?

For a VW Transporter T5, T6 or T6.1 SWB, approximately 10–12 m² of Termoflex and one 10.5 m² roll of Termo Wool 50 mm provide a useful starting point.

For a LWB Transporter, allow approximately 14–16 m² of Termoflex, with a 10.5 m² Termo Wool 50 mm roll as a practical starting quantity for the main cavities.

How much carpet do I need to line a VW Transporter?

For Eaglefelt 2 m wide 4-way stretch lining carpet, allow approximately 10–12 linear metres for a Transporter SWBand 12–15 linear metres for a Transporter LWB.

How much insulation do I need for a Fiat Ducato L3H2?

For a typical Fiat Ducato L3H2 camper conversion, approximately 20–24 m² of Termoflex is a useful planning estimate.

For the main thermal cavities, one 14 m and one 7 m roll of Termo Wool 50 mm provide approximately 15.75 m² of thermal fill insulation.

Peugeot Boxer and Citroën Relay vans of comparable body size have broadly similar requirements.

How much insulation do I need for a Mercedes Sprinter?

A MWB Sprinter may require approximately 16–20 m² of closed-cell insulation, while a LWB model may require around 20–24 m².

An XLWB conversion can approach 24–30 m², depending on how extensively the vehicle is insulated.

How much sound deadening do I need for a van?

You normally need considerably less butyl sound deadening than thermal insulation because butyl does not need to cover every metal surface.

Around 2–3 m² is a useful starting point for a medium van, while larger panel vans may require around 3–5 m².

Should I cover my entire van with butyl sound deadening?

No.

Butyl sound deadening works by adding mass and reducing resonance in sheet-metal panels. Strategic placement on large resonant areas is normally more efficient than automatically covering every available surface.

What is the best insulation for campervan condensation?

Closed-cell foam is an excellent first insulation layer against the metal vehicle body because it resists moisture and creates a thermal break.

Eaglefelt Termoflex is designed for this part of the insulation system.

Ventilation remains essential: insulation can help manage condensation risk, but it cannot remove the moisture generated inside an occupied campervan.

Is 50 mm insulation suitable for a campervan?

Yes, where the cavity is deep enough.

We recommend Termo Wool 50 mm as the main thermal fill insulation in deeper wall and roof cavities. Use 30 mm insulation where space is restricted rather than heavily compressing the 50 mm material.

Is lining carpet the same as insulation?

No.

Lining carpet provides the finished interior surface and can contribute to acoustic comfort, but it is not a replacement for proper thermal insulation or condensation control.

How much extra van insulation should I order?

Around 10% extra is a sensible allowance for many DIY conversions. Complex layouts, unusual body shapes and first-time installations may justify a little more.

Plan the Complete Van Insulation System Before You Start

Ordering van insulation becomes much easier when you stop thinking about insulation as a single product and start thinking about the complete build.

Control vibration with Premium Sound Blocker.

Create a thermal break with Termoflex.

Fill the main cavities with Termo Wool 50 mm.

Use Termo Wool 30 mm where the available depth is limited.

Finish the interior with Eaglefelt 4-Way Stretch Lining Carpet.

This gives every layer a clear job and makes calculating your material requirements much easier.

Whether you are converting a compact VW Caddy, a VW Transporter, Ford Transit Custom, Renault Trafic, Fiat Ducato, Peugeot Boxer, Citroën Relay, Mercedes-Benz Sprinter, VW Crafter, Ford Transit or Renault Master, the calculator above provides a practical starting point for planning your project.

Shop the Eaglefelt Van Conversion Range

Premium Sound Blocker – Van Sound Deadening

Termoflex – Closed-Cell Campervan Insulation

Termo Wool – Thermal Fill Insulation

4-Way Stretch Campervan Lining Carpet

High Temperature Trim Spray Adhesive

Read the Complete Camper Van Insulation Guide

Please note: All quantities in this guide are approximate planning recommendations, not vehicle manufacturer specifications. Actual material requirements vary according to vehicle generation, model year, wheelbase, roof height, glazing, interior layout, roof vents, doors and installation method. Always consider the details of your individual conversion before placing your final order.