How Does Shed Insulation Work?

Have you ever gone into your shed in the summer and felt stifled because of the scorching heat? Perhaps you’ve seen icicles forming on the rafters during the winter months. Thankfully, there is a way to eliminate these problems for good, so you can comfortably use your shed/outbuilding all year round. All you need is to have high-quality shed insulation installed.

If you are planning to use your shed regularly, then investing in shed wall insulation is essential. Insulating this area helps keep the interior temperature constant and unaffected by any extreme weather conditions outside.

Of course, you wouldn’t typically be considering this sort of project if you only intended to use your shed as storage space for your garden tools. Nowadays, though, an increasing number of people are opting to turn sheds into unique, useable areas that are separate from their main properties.

It therefore makes a lot of sense to have an insulation system installed in your shed, especially if you’re going to spend time in there quite often. From man caves to home offices and garden bars, insulation is sure to make your shed a cosier, more enjoyable place to be.

why you need shed insulation

What To Consider Prior To Getting Shed Insulation Installed

  • 1. The Basics Of Heat Transfer

  • First, it’s essential to understand that heat always gravitates towards colder areas in an attempt to make the temperature more consistent. That’s why sheds easily heat up from the outside during summer and turn frigid from the cold in winter. There are three concepts that are in play here, namely:

    • Conduction
    This refers to how heat moves through solid objects. Through conduction, your shed will either gain or lose heat through its ceiling or walls. The walls, together with studs, create a continuous transfer of heat, both in and out.

    • Convection
    Heat moves through the air around us in a process called convection. Heat will move in and out of the shed through ceilings and walls this way, and any cracks or holes in the structure will tend to speed up this process.

    • Radiation
    Heat waves can transfer from one object to another – this process is referred to as radiation. This happens every day, from the sun shining through your window to the warmth of a fire making its way across the room. You can feel it when you sit on a rock that has been warmed by the sun. When you sit on a cold chair, your body warms it up, and it will stay that way until its temperature has equalised with the temperature of the air around it.

  • 2. Meeting Your Climate Requirements

  • You’ll no doubt be aware of the difference between the temperature outside and the temperature in your shed. Usually, freezing temperatures outside will affect the environment in your interiors much faster than hot, summer temperatures. Either way, if you feel uncomfortable extremes of heat or cold in your garden shed, you’ll want to have more insulation installed in your walls and ceiling.

  • 3. Additional Installation Or Start From Scratch?

  • It’s entirely possible that some form of insulation is already installed in your shed. Your first decision should be whether you want to leave the existing system in place and simply add an additional layer of insulation, or have it removed entirely and start again from scratch. Once you add spray foam insulation to the shed, the fresh layer provides additional U-value.

The U-Value Of Insulation

The U-Value is a term that is common in the construction and renovation industries. Essentially, it’s an indicator of how good a material is at preventing conducive airflow or heat/thermal transmittance.

Working out the U-Value of a given area is relatively simple – you need to take into consideration the thermal resistance of each material making up the building application in question. The thermal resistance is the thickness of a building element ÷ conductivity (k-value) – this is the R-Value. In order to find the overall U-value, you must add the R-Value of each element together and divide this number by 1, and this will equal the U-Value.

The recommended U-Value of the materials that you should use depends on the climate that you live in. You can also refer to local building regulations or ask your local buildings inspector about the minimum values that are needed for your location.

There are different shed insulation options to choose from on the market, and they all differ in terms of form and composition. Here, we’re going to focus on spray foam, which is one of the latest insulation solutions on the market today.

which shed insulation should I use

• Roofs - Flat & Pitched

• Cavity Walls

• Underfloor on a suspended timber floor

• Warehouse – Roof/Walls

• Many more...

Spray Foam

Spray foam insulation is excellent for concrete and frame walls, and can also be applied to tight, odd-shaped spaces. Spray foam can be used in the following areas:

• Roofs - Flat & Pitched
• Cavity Walls
• Underfloor on a suspended timber floor
• Warehouse – Roof/Walls
• Many more...

Spray foam is arguably the best insulation for sheds that you can use because it has one of the highest insulating factor per inch of all insulation materials.

who is the best shed insulation company

Where To Get The Best Spray Foam For Your Shed Insulation

If you’re looking to invest in insulation, get in touch with Eco Spray Foam today. We are an Icynene-accredited quality insulation provider that offers bespoke insulation services across the entire United Kingdom.

For over two decades, Eco Spray Foam has been delivering premium quality products and expert services across the whole of the UK. We have the latest technological insulation solutions for modern-day applications and are certified users of the Icynene spray foam product, which is one of the newest insulating technologies on the market today.

To find out more about shed insulation in the UK or to get a free insulation survey for your residential or commercial property, get in touch with us by ringing 0203 411 5188 or by using our online contact form at

Our friendly team of experts here at Eco Spray Foam are ready to provide advice and guidance on the best insulation solutions for your home and garden buildings.

Frequently Asked Questions

  • Can you insulate a plastic shed?

  • Our closed cell insulation will adhere to most surfaces, including plastic and metal, acting as a garden house shield. This allows us to insulate most sheds regardless of build materials.
  • Do I need a vapour barrier under my shed?

  • The need of a vapour barrier depends on the materials involved and the build-up of the area to be insulated. Here at Eco Spray Foam we can complete a condensation risk analysis to give you a definitive answer to if a vapour barrier is needed or not.
  • Will insulating my shed keep it cooler?

  • Yes, it will. Installing a shed insulations solution is an excellent idea, not just to keep the structure warmer during winter, but also to keep the summer heat out. With insulation, temperature regulation becomes much easier and more effective.
  • Can I insulate my shed with polystyrene?

  • If you intend to set up electrics in your shed (which is often the case, as it’s a major reason why people consider insulating their sheds), be aware that using polystyrene for insulation is dangerous. This is because polystyrene is combustible, making it a serious fire hazard to your building.
  • Is it worth insulating a shed?

  • Getting various forms of insulation, such as underfloor insulation, for your shed is highly cost-effective since you end up saving money on heating costs in the winter. Also, when you are paying for heating, insulation will reduce the amount of heat that escapes, especially in the winter months.
  • Can you insulate a steel shed?

  • It's an excellent idea to install roof, wall, or shed floor insulation in your metal shed to keep it in the best shape possible. By doing this, you'll not only protect the items stored inside but also prolong the lifespan of the shed too.
  • What is the best way to insulate a summerhouse?

  • The logical way to proceed with your garden building insulation is to place the insulation material within the timber frame. This may be within the walls and the roof. Dependant on the build material we would recommend open or closed cell spray foam insulation.
  • What is the best insulation for a shed?

  • Spray foam insulation for sheds is practical, easy to install, and can be retrofitted if you didn't have it installed when your shed was being built. For the best property insulation solutions, feel free to get in touch with our experts now!

A Guide To Shed Insulation

It is useful to know that not all sheds can be insulated. However, insulation can be installed in the majority of garden sheds.

To start, you’ll need to thoroughly inspect your shed to make sure that it’s dry and waterproof. If any portion of your shed is leaking before you install insulation, then you can expect mould and decay to occur, which defeats the point of insulating it in the first place.

Shed Insulation Guide

How To Insulate A Shed For Use All Year

If you’re looking to use your shed all year round, you’ll probably want to consider having spray foam shed insulation installed to ensure a warm and comfortable workspace. An ordinary garden shed is often made entirely from timber and a felt roof, which doesn’t offer much protection from the cold, damp or draughts. The process of installing rafter thermal protection isn’t as daunting as you may think and is relatively affordable too.