Insulation Information for Home owners

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We manufacture loft insulation products designed for homeowners and simple DIY installation with an immediate impact on energy consumption. For more information visit our Space Insulation product website and our YouTube channel.

Space Insulation

Space Insulation is our specialist range of loft insulation products designed for simple DIY installation available at a number of UK retailers


Browse our YouTube channel to find videos related to DIY and energy efficiency

Homeowner FAQs

What are the benefits of loft insulation?

  1. In the winter, loft insulation will keep your home warmer, for longer.
  2. It can contribute to savings on your heating bills and making your home more energy efficient.
  3. During hot weather, it also helps to keep your home cooler.

How much loft insulation do I need?

To meet current Building Regulations you need a minimum depth of 270mm of Glass Mineral Wool insulation. This is achieved by laying 100mm between the ceiling joists and 170mm cross-laid over the joists.

You will need to measure the area of your loft to calculate how many rolls of loft insulation you will need to buy, as well as understanding how much loft insulation you already have.

To give an indication of how many rolls you may need, please see the table below:




Average Terraced House 40m2

Average Semi-Detached House 50m2

Average Detached House 60m2

Large Detached House 80m2



M2 per pack

No. of packs

No. of packs

No. of packs

No. of packs

Base Layer

Space Loft Roll 100mm






Top Layer

Space Loft Roll 170mm






Top Layer

Space Loft Roll 200mm






Top Layer

Space Blanket King Size 200mm






Top Layer

Space Blanket 200mm (370mm wide)






How do I find out how much loft insulation I already have?

Simply push a tape measure or ruler down the side of a piece of loft insulation until it hits the plasterboard ceiling to measure the depth. If the insulation comes up to the top of the joists only, it is likely that you have a depth of 100mm.   

Can I use my loft for storage once it's insulated?

If insulating your loft to 270mm, you will need to use loft legs to support decking boards. This will ensure your loft insulation is not compressed, which would reduce its performance. You must also ensure you leave an air gap of 50mm between the underside of the loft boards and the top of the insulation to prevent condensation.

How long does it take to insulate my loft?

Allow about half a day once you have cleared the loft of its contents. You will need one layer of 100mm between your roof joists, then a second layer of 170mm on top (cross-laid) to comply with current Building Regulations.

What tools will I need to use?

You will need gloves, a face mask and goggles to protect against dust whilst in the loft. You will also need a crawl board long enough to span three joists, to provide a safe working area. In addition, a retractable knife will be needed to carefully open the packs.

Will I need to cut rolls to size?

If you are laying insulation between the joists, you will need to separate the pack according to your joists widths. All thicknesses of Space Loft Roll are pre-perforated to suit both 400mm and 600mm joist widths. Whilst the insulation is still in the pack, cut through the roll at the desired width (indentation marks on the pack will provide a guide). For ease of carrying in to the loft, keep the insulation in the packaging until you are in the loft space.

If over-laying across existing insulation, rolls can be used full width. However, you may need to trim to length.

Do I need space between the loft insulation and the eaves?

Yes, retain a 50mm air gap between the loft insulation and the eaves. This will help prevent condensation.

Should I insulate underneath the water tank in my loft?

No, do not insulate directly below your water tank. The warm air from the room below will help prevent your water tank from freezing in cold weather. Do insulate around and above the tank to prevent warm air from escaping.

Can I insulate over the top of downlights?

It is recommended to use downlight covers to prevent downlights from overheating and causing a fire risk. Once covers are installed, insulation can be laid around the cover and over the top.

Can I insulate over the top of electric cables?

A cable feeding an electric shower SHOULD NOT be covered as this risks overheating. Instead the cable should be laid on top of the insulation.

If electric cables are low-voltage, they can be covered with insulation. This tends to be the case in newer homes where cables are often clipped to the joists. However, if in doubt, ALWAYS ensure cables rest on top of the insulation.

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