Isover Spacesaver - Glass Mineral Wool Loft Insulation Roll

Special Price £49.92 PRICE PER ITEM Regular Price £62.40
Estimated Delivery: 2-5 Days
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Product Description

Overview of the Isover Spacesaver Glass Mineral Wool Loft Insulation Roll 

  • Specialised design – maintains high insulation levels in your cold roof 
  • Maintains a consistent performance – thermal conductivity of 0.044 W/mK 
  • Innovative design – made from highly effective glass mineral wool 
  • Minimal impact on the environment – zero ODP levels and low GWP levels 
  • For older and newer buildings – great for both refurbishments and brand-new builds 
  • Straightforward installation – simple handling, straightforward application 
  • Extremely resistant to fire – non-combustible material with Euroclass A1 fire rating 
  • Designed to last – resistant to the damage caused by water vapour and mould 

Introducing Spacesaver – a unique loft insulation roll product specially created for use at the joist level of cold roofs. Designed to maintain a comfortable temperature within your property, it is perfect for both new builds and renovations. 

What is Isover Spacesaver Made From? 

This product has been produced primarily using glass mineral wool. Isowool insulation not only performs well, but ensures that the structure of the roll itself retains high levels of strength, durability and flexibility throughout its lengthy lifespan. 

What Thicknesses and Sizes are Available? 

Thickness (mm) 

Length (mm) 

Width (mm) 

Coverage (m2) 














Is Isover Spacesaver Resistant to Moisture?  

One of the benefits of glass mineral wool is that the properties it possesses are extremely resistant to moisture damage. This is ideal for the its use in cold roof applications where moisture ingress could prove to be more common. 

What Level of Thermal Conductivity Does This Insulation Offer? 

This roll has a thermal conductivity rating of 0.044 W/mK, and thanks to the high-quality materials used in its production, it can maintain this performance level throughout the year. The wool also absorbs noise, making it ideal for residential buildings. 

Is Isover Spacesaver Environmentally Friendly?  

This roll has been manufactured using up to 86% recycled glass, significantly reducing waste, size and design reduce the amount of onsite waste too. On top of this, the slab has achieved a remarkably Global Warming Potential level (less than 5) and also zero Ozone Depletion Potential levels (ODP). 

How Does This Insulation Perform When Exposed to Fire? 

The fire risks of a building product are always something to consider whether building a new property or renovating an older one, and this glass wool roll excels. As a non-combustible product it boasts an A1 rating in the Euroclass Fire Rating set of requirements – one of the highest grades available. 

Where Can Isover Spacesaver Be Used?  

This roll has been specially designed as a space saving cold roof application option. After a straightforward installation process, it will perform outstandingly and consistently over the course of its long lifespan. It is installed in at least two layers – one between the joists and one over the top of them. 

Have a Question About the Isover Spacesaver Glass Mineral Wool Loft Insulation Roll? 

If you have any questions, whether it be about this product or another in our extensive range, please contact our dedicated customer care team on 01295 565 565 or use our online chat. We’ll help you pick the ideal solution for your project!  


Click Here to View All Insulation 

Product Specifications

View as Feet & Inch
More Information
Lead Time2-5 Days


Delivery Information

We understand that ordering products online can be daunting, especially when ordering roofing materials. It is for this reason that we make our delivery processes as simple as possible for you. However, there are a few things to know about our delivery processes. These include:

  • When placing an order, you’ll see a breakdown of your delivery charge in your shopping cart. These charges are for the UK mainland only, and additional charges may apply for Northern Ireland, the Scottish Highlands and other regions.

  • Deliveries only take place on working days (Mon - Fri) and do not take place on Bank Holidays. 

  • You’ll find an estimated delivery on the majority of product pages below the 'Add to Basket' button. Whilst we aim to deliver your items within the estimated delivery, it is only an estimate. 

  • You're able to select a preferred delivery date in your shopping basket. Whilst we aim to deliver your items on this date, it is not guaranteed.
  • Orders placed after 12pm, during the weekend, and on a bank holiday will not be processed until the next working day. Please consider this when placing your order as it may impact your delivery date.

  • After you’ve placed your order, you’ll receive an order confirmation by email outlining the details of your order. Please check your order confirmation email and inform us of any mistakes or errors immediately.

  • Shortly after receiving your order confirmation you’ll receive a separate email confirming the planned delivery date.

  • We can only provide a delivery date and are not able to confirm the time delivery will be attempted. Therefore, we ask that somebody is able to accept and sign for your items throughout the started delivery date.

  • If you are unable to accept and sign for an order, it can be left in a safe location in most circumstances. Please email [email protected] if you would like an item to be left without a signature. 

  • Whilst we aim to hold the majority of our products in stock, due to the vast number of products we offer this is not always possible. Because of this we are required to send your items directly from the manufacturer on a small number of occasions, at which point a different delivery charge may apply as standard.  

  • On occasions the items ordered may be shipped from different depots, which could result in seperate deliveries taking place.

If you have more questions about our products or delivery, please contact our team online or by telephone.

Refund Information

We understand mistakes can be made and we therefore keep our cancellation and returns policy as simple as possible. However, there are a few things to know about cancelling an order or returning an item. These include:

Items Not Required

Should you no longer require an item, you have the right to cancel within 14 days of delivery unless the items are custom made. You needn’t give us reason for cancelling your order but will be required to notify us by email. Once notified we will provide an address for the items to be returned to and arrange the necessary refund.

Faulty or Damaged Items

On the rare occasion that an item is delivered faulty or damaged, we will exchange it or provide a refund. We must be notified by email as soon as possible and may require images. To avoid such an issue, we ask that customers do not sign for damaged goods.

Custom Made Items

A handful of items are ‘Custom Made’. This means they are typically manufactured to the specifications provided by you and are therefore non-refundable. This is unless they are deemed to be faulty or damaged at the time of delivery, at which point you should notify us by email as soon as possible.

Further Information

For further information on cancellations, returns and refunds please read our full policy by clicking here. This confirms any other requirements to consider (i.e. packaging), fees that may be charged (i.e. admin charges) and our policy for businesses.