How to Insulate a Shed for Free with 5 Material Options

Even if you are on a tight budget, there are numerous ways to insulate your shed using various types of insulation economically. Each type offers unique benefits and can be tailored to your specific needs. Some of the methods require the cheapest cost but can still offer great offers.

The following list shows you how to insulate a shed for free using easy-to-find and budget-friendly materials, along with each of their benefits and drawbacks.

5 Free Material For Shed Insulation

how to insulate a shed for free

Bubble Wrap

Not only is bubble wrap insulation the most basic and inexpensive option on this list, but it’s also surprisingly effective when used correctly. While it’s challenging to find a perfectly efficient way to insulate the shed for free, this material can be the best insulation for shed option you can get for free.

That being said, it doesn’t provide as effective insulation in isolation as other materials listed here. That being said, it’s still quite effective, especially if you use it conjointly with fabric with a harder texture like hardboard.

Polyisocyanurate (PIR) Board

The PIR board, a type of insulation board, is commonly known by brand names like Celotex and is highly effective for shed insulation. This material, a form of foam insulation, is made from closed-cell and rigid foam, making it an excellent choice for insulating flooring, roofs, and shed walls.

Polyisocyanurate (PIR) board

As it is a popular material, you won’t have a hard time to find a PIR board, but you still need to find one with a suitable size as the frame of your shed. It does carry advantages, but it falls into the more expensive side of this list.

Breathable Membranes

Also known as breather membranes, this material has water-resistant yet air-permeable qualities. This material is commonly used for roofs, external walls, and even around doors and windows, as it can prevent moisture from seeping in while improving ventilation, improving ventilation inside the building.

Breathable membranes for shed insulation

This characteristic makes breathable membranes a good DIY material option for you who want to know how to insulate a shed for free.

Fiberglass Roll

Fiberglass roll, typically crafted from repurposed glass, stands out as an environmentally friendly insulation material. Its ease of installation, coupled with its quick setup, makes it a popular choice for shed insulation. The structure of this material provides a lot of air pockets that make it unable to shrink or change form over time.

This means fiberglass roll is a cost-effective material investment. However, it has a drawback, where its ability to provide insulation is reduced when exposed to water. The micro-glass slivers it contains are also potentially damaging if inhaled.


For a small shed, plasterboard can be an ideal insulation material because it enhances the walls’ thermal performance without eliminating plenty of space inside. It can be installed by using simple materials and tools like glue, nails, and screws. Despite being practical and inexpensive, plasterboard offers aesthetic value to the shed because it provides the appearance of plywood.

If you ask what ideal insulation material to use on your shed, it depends mainly on which section of the shed you plan to insulate and your budget. It may also depend on the current insulated condition of the shed. However, in general, the material options provided in the list of how to insulate a shed for free above will suffice just well.

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RoofLast is an experienced author and roofing expert. With years of practical experience in the field authored several informative articles on various aspects of roofing, including installation, maintenance, and repair