Can I insulate my shed with Styrofoam?

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Most people are familiar with insulation for their home, but they do not always consider insulating their shed. Insulating your shed with foam is a smart way to keep the contents of your shed safe from extreme temperatures and weather.

Why Use Foam for Insulation?

Very Effective Insulator

Closed-cell foams, such as polystyrene (EPS) and polyethylene, are fantastic insulators with high thermal resistance. Thermal resistance is calculated through a material’s R-value. A higher R-value means the material is better at resisting the flow of heat between two areas. R-values are defined based on the thickness of the tested sample; layering two identical sheets of foam will provide double the thermal resistance.

Durable and Long-Lasting

Thanks to the structure of foam, it is one of the most durable and long-lasting materials on the market. In addition to the thermal qualities, closed-cell foams are resistant to moisture and water vapor, rot, mold, and mildew.

Easy to Apply in Any Condition

Compared to spray foam insulation, using sheets of foam requires less tools and involves less cleanup. Additionally, spray foams usually require certain air and surface conditions to be applied appropriately. Sheets of foam, on the other hand, do not have those restrictions and can be safely installed year-round.

Before You Begin

Before you dive into your insulation project, there are a few things you should take care of:

Inspect for Leaks and Cracks

The best insulation in the world will not do much if there are holes in your shed! Before insulating your shed with foam, it is a good idea to fix and seal windows, repair siding, and patch rooftop leaks. Keep in mind that a wood or vinyl shed exterior has a lower R-value than closed-cell foam insulation, but it still contributes to the overall thermal resistance of the enclosed area.

Take Care of Other Renovations

If you plan on converting your shed into a small home or barn, you’re going to want to do more than add insulation and call it a day. Depending on the climate, you may want to add heating and air conditioning to ensure the comfort of your shed’s inhabitants throughout the year. This is also a good time to take care of any other electrical upgrades. Extra lighting and electrical outlets can go a long way towards transforming a shed from a simple storage area to a cozy home or productive workspace. Unless you have experience, it is best to hire an electrician to take care of any electrical renovations.

Insulating Your Shed With Foam

Rigid Polystyrene for Flat Walls and Ceilings

Much like insulating your home, the primary way to insulate your shed is to apply sheets of foam to the walls and ceiling. Using an electric knife, sheets of polystyrene foam can be easily cut to specific sizes to cover your shed fully. The recommended method for affixing the insulation to the walls and ceiling is with a non-solvent spray adhesive, such as Camie 373.

Pliable Polyethylene for Everything Else!

If your shed has a curved roof, the rigidity of polystyrene may not be ideal for the job. Similar to polystyrene, polyethylene can be cut using an electric knife. It can also be adhered to the wall or ceiling using spray adhesive. If your shed contains pipes, they can also be insulated to prevent energy loss. This can be accomplished by wrapping the pipe in polyethylene roll, and using spray adhesive, adhesive tape, or rope/twine to hold the foam in place.

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