There are a number of ways you can insulate your shed floor, whether it’s before the shed has been constructed or afterwards.

Insulation will ensure your garden shed is a warm and comfortable haven to be used all year round. Varying in costs, you need to be aware your budget will reflect the quality of insulation and level of protection so be sure to have that in mind. 

There are specific areas of your shed you can focus on when it comes to insulation: the walls, the floor, windows and doors. This guide will focus on how to insulate your shed floor.

How to insulate an existing shed floor

If you’ve had your garden shed for some time, or you’ve only come to think of insulation after it’s been erected, not to worry. Insulation can be applied to the existing floor of a shed. 

Ways to insulate an existing shed floor:

1. Lay a water-resistant and breathable membrane directly on the floor

2. Lay a rug or a section on top of the membrane

This is your cheapest and quickest way to insulate your shed floor.


3. Install a false floor using non-flammable, expanded polystyrene (which will cause a reduction in height but will act as a floating floor) and then place a layer of plywood on top. 

How to insulate a new shed floor

If your new shed is yet to be installed you could think of a more effective option such as underfloor insulation albeit more costly.  

If you decide to take this approach, you will need to fit underfloor insulation to the grid of your shed base. This could include using insulation foam boards for sheds or sheets of polystyrene and ensure the insulation is sufficiently protected.

The bearers should be at least 25mm from the damp ground to offer sufficient ventilation space for the insulation to be effective.

An insulation board for sheds will be your most effective option to retain heat which is typically lost through the shed floor.

Need help?

If you need any guidance or advice when insulating your shed floor, please do not hesitate to get in touch on 01233 822042 or contact us online.