Underground spaces with a soil-facing wall require basement wall insulation to protect the room from heat loss and moisture build-up.

ROCKWOOL solutions can be applied to these kinds of walls in domestic housing – and are ideal for underground flats, cellars and conversions below street level.

Discover our range of stone wool batts – as well as our system solutions. Our products and solutions are adaptable, robust and can help transform an unwelcoming basement into a comfortable living space.

Why do we need basement wall insulation?

More and more homeowners are choosing to renovate their basements and cellars. Indeed, statistics suggest this can add nearly seven percent to the overall value of a property1.

However, these areas need insulation to improve temperature regulation and tackle damp and mould.

This is particularly important for soil-facing walls, which block natural ventilation through the wall itself, causing moisture to build up if not properly insulated.

While dry lining solutions are useful for protecting against cold intrusion from air-facing walls – basement wall insulation is perfect for soil-facing walls.

Benefits include:

  • Water repellent properties – preventing water seeping in.
  • Temperature regulation – acting as a buffer against heat loss.
  • Breathability – helping air flow through, without losing excess heat.

Calculator and savings

To determine how much insulation you’ll need, you must first measure the wall you’re insulating.

If you’re installing in-between wall studs, you need to choose a product that has a specific width. This will allow it to fit snugly, with no gaps. Factor this into your calculations.

Once it has been installed, occupants can enjoy greater energy savings, as less heat is escaping through wall spaces.

The basement should also be properly ventilated. That way you prevent it being a damp, musty space and you can use it as a living area, adding additional value to a home – as well as the potential to rent it out to tenants as an extra income source.

REDDry System installation step by step 03
Insulating basement walls brings direct energy savings. With proper ventilation, ROCKWOOL solutions can even create additional living space – such as a game room for kids.

Roger Peeters

ROCKWOOL Group Product Manager

Sustainability and energy efficiency

ROCKWOOL products are circular in a way that’s kind to the environment.

We create them using one of the world’s most abundant natural resources: stone9. Our resulting stone wool is also fully recyclable.

This means our solutions can be re-used again and again – without degrading in quality10.


Construction Site: Neat Clean Crawlspace, Floor Joists, and Pony Wall - crawl space design and installation process


What type of insulation is best for basement walls?
Do you need a vapour barrier in basement walls?
Should you insulate basement walls on the inside?

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