What is Loft Roll?

Loft roll is an insulation material formed of mineral wool or fibreglass. The rolls are lightweight, easy to handle, non-combustible, and thermally efficient. Loft roll insulation is designed to be installed in lofts and pitched roof spaces. The rolls come in tightly compressed packaging, making delivery and moving them up into the loft easy. Standard Loft rolls have a thermal conductivity of 0.044W/mK.

To create a loft roll, recycled glass fibres are bonded together. During the manufacturing process, small pockets of air are trapped between the fibres. The still air makes excellent insulators and will improve the overall thermal value of the roll. Loft insulation rolls have been awarded a fire reaction A1 rating on the Euroclass scale.

What Are The Thicknesses Of Loft Roll

Loft roll should be installed with a combined thickness of over 270mm so for the top layer a minimum of 200mm thickness is recommended and 70mm thickness or above between the rafters. The thicker the better to provide the best insulation to the house/ commercial space, maximise savings and keep energy bills low.

You can buy glass mineral wool loft insulation rolls in different thicknesses. This includes 100mm, 150mm, 170mm, and 200mm.

The benefits of loft roll

  • Non-combustible
  • Creates a more comfortable living space where temperature levels are easily controlled.
  • 25% reduction in heat loss.
  • Saves money on your energy bills by reducing heat levels escaping through the loft / roof space.
  • Energy efficient and sustainable – reducing heat level effecting climate change and global warming.
  • Flexible, lightweight, and easy to install.
  • Improves thermal and acoustic quality of the property.
  • When installed correctly loft roll will have a lifespan that will last as long as the building does.
  • Once loft insulation is installed there should be a noticeable reduction in the noise caused from outside your house, especially when it comes to the upper floor of your house.
  • Loft insulation gives a higher rating for your home’s Energy Performance Certificate and having a higher rating will help improve your home’s value and its saleability.
  • In most cases installing loft insulation will disrupt your home or effect the rest of the property.
  • When properly researched standard loft insulation installation does not require a professional (if there are no complications such as tight hard to reach spaces, damp, mould, structural damage, etc).
How is loft roll installed?

Before installing loft roll the area is checked for wiring, cables, downlighters and hot flues and adjustments are made to cater to these factors such as being kept above the insulation material or leaving gaps. Protective clothing is recommended but not essential. Crawling boards are also recommended as most of the ceiling will not be supported.

Start at the furthest point of the loft hatch and lay 100mm thick insulation between the joists. Push the roll in at the edges to get a snug fit but don’t push down too much as you want as much air as possible to be trapped in the insulation. If you have any old insulation in place you can decide to either start fresh or to simply lay the new insulation on the top of the old insulation.

Start laying the roll at the eaves making sure you leave a slight gap for the air to circulate (25mm ventilation gap). Then roll out towards the centre of the loft. If you have difficulty reaching the corners of the room, a broom stick can be handy to help to press the loft roll down. When the roll runs out, start a new role, and put the 2 ends together. Once you have filled between the joists you now need to lay another layer across the top of the joists to avoid heat loss.

How to cut loft roll

When you need to cut the roll, mark the length where you need to cut. Grip the roll between 2 boards (one above and one below to hold the role in place) and cut with a Stanley knife.

Popular Loft Roll Products


Knauf Earthwool Loft Roll 44

Knauf Insulation is one of the most well-known manufacturers of loft rolls. Knauf Earthwool Loft Roll 44 products have partially cut perforations and can be used between joists at either 400mm or 600mm centres or used unsplit as a full-width roll

  • Thicknesses: 100mm (13.89m2), 150mm (9.18m2), 170mm (8.01m2), 200mm (6.84m2)
  • Width: 2×570mm / 3×380mm
  • Material: Glass mineral wool
  • Do not breed bacteria or fungi
  • Rated A1 on Euroclass scale – Non-combustible


Isover Spacesaver 44 Loft Roll

Isover Spacesaver is a very popular option of loft rolls. Isover loft rolls are pre-perforated to 3x386mm and 2x580mm widths. You can install them between and over joists in pitched roofs, and between joists in flat roofs and ground floor suspended timber, also suitable for cold roof applications.

  • Thicknesses: 100mm, 150mm, 170mm, 200mm
  • Width: 2×580mm / 3×386mm
  • Material: Glass fibre mineral wool
  • 80% recycled glass
  • Rated A1 on Euroclass scale – Non-combustible



Rockwool Roll, Twin roll, and Rollbatt

Rockwool Loft Insulation is a multi-functional, medium-density lightweight material. loft rolls are pre-perforated to 3x386mm and 2x580mm widths. Used for a wide range of applications including roof spaces in all types of building and as an overlay for ceiling tiles in suspended ceilings.

  • Thicknesses: 100mm, 150mm, 170mm
  • Width: 1200mm, 400mm (3 per pack) / 600mm (2 per pack)
  • Material: Stone wool
  • Improves acoustic performance
  • Rated A1 on Euroclass scale – Non-combustible



Superglass Multi Roll 44

Knauf Insulation is one of the most well-known manufacturers of loft rolls. Superglass Multi Roll 44 products have partially cut perforations and can be easily cut and used between joists. Superglass Multi roll will not degrade, sustain vermin, nor allow the growth of fungi, bacteria or mould.

  • Thicknesses: 100mm, 150mm, 170mm, 200mm
  • Width: 1200mm, 1160mm
  • Material: Mineral Wool
  • Easily split as per requirements
  • Rated A1 on Euroclass scale – Non-combustible


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