Basement insulation offers an effective solution for minimising heat loss and reducing noise in below ground spaces.

Basement walls, floors and ceilings can be insulated to improve thermal performance, reduce noise transfer from the room, and ensure fire safety. 

This page covers everything from installing basement foundation insulation, to the benefits of insulating below ground.

Why do we need basement ceiling insulation?

Below ground insulation in a basement is ideal to reduce heat loss in a property, protect against damp1 and create a comfortable living space. 

Basements are normally the coldest areas of any property and at risk of damp. Effective insulation helps improve these conditions – and the overall energy efficiency of the building.

With existing basements, internal wall and floor insulation will significantly reduce heat loss. Basement ceiling and soffit insulation can create thermal improvements to the room above and enhance the acoustics of the room.   

 

Benefits of using ROCKWOOL insulation include2:

  • Reduced heat loss
  • Acoustic absorption
  • Fire resistance
  • Cost-effectiveness

Calculator and savings

The size of the basement and the areas you choose to insulate will determine any potential savings. Adding internal wall and ceiling insulation can further increase these savings.

Check your local building regulations – the recommended U-value for wall, floor or ceiling insulation varies depending on the location and whether it’s for a new build or extension. If there is already some level of insulation it may just need topping up to meet current building regulations.

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Our products have a direct impact on energy consumption, are aesthetically pleasing and absorb sound – reducing noise pollution inside the building and to the external environment.

Roger Peeters

ROCKWOOL Group Product Manager
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The ROCKWOOL Red Book

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3.3 MB

Why stone wool?

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Soffit Slab Datasheet

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1.8 MB

Sound Insulation Slab Datasheet

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1.2 MB

ROCKFLOOR Datasheet

Financial support

Financial support may be available for insulating your basement. Visit the Energy Saving Trust website for further information on floor and wall insulation grants for basements.

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FAQs

FAQs

Should I insulate my basement ceiling?

Insulating a basement ceiling helps improve energy and thermal efficiency. It can also reduce sound transfer and provide fire protection to rooms above.

Do basement walls need to breathe?

Basement walls need to be sealed to prevent moisture ingress from the external ground. Air tight constructions should be used to prevent moisture vapour entering the construction and condensing on cold surfaces. Trapped moisture can cause issues so it is important to ensure that surfaces to be insulated are clean and dry.

Do I need a vapour control layer for basement wall insulation?

Yes, for internal dry lining solutions you should ensure a vapour control layer is installed to the warm side of the construction prior to the application of the plasterboard lining. This ensures an airtight construction to prevent moisture vapour penetrating the construction.