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Loft Insulation

Check whether you have any insulation in your loft and its thickness. If it is less than 270mm, your savings can be increased by adding the missing thickness on top of the existing insulation. You maybe able to save up to £300 per year, if your loft or attic is correctly insulated. Lofts are usually cheaper and easier to insulate than roofs.

Installing insulation in your loft can cut your energy bills and help keep your home nice and cosy. There are several different types of loft insulation to choose from. It is possible to do it yourself, If your loft is easy to access and has no damp or condensation problems.

Before adding any insulation however, it is very important to understand the moisture and ventilation dynamics within the roof space to avoid the risk of condensation. Condensation occurs where warm moist air comes into contact with a cold surface. Build-up of condensation poses big threat to the integrity of a timber structure and may cause timber components to rot. Type of roof construction can be defined by the way moist air is handled within a roof structure.

In the majority of existing buildings the moist air is diffused through the ceiling into the roof void. Bituminous felt (as a roof underlay) - highly impermeable to air and water - traps moist air in the loft and is removed through cross ventilation. 

In case of the more modern ‘breathing roof’, vapour control layer (VCL) is placed below the ceiling insulation to prevent any moisture from passing through the ceiling. Any small quantity of moisture that does penetrate can be diffused through the ‘breathable’ roof underlay and then dispersed by ventilation through the slates or tiles.

Types of Loft Insulation
  • Batts and roll insulation,
  • Multi foil and reflective insulation,
  • Rigid sheet insulation,
  • Loose fill insulation,
  • Blown-fibre insulation.
Batts and roll insulation

This is the most common form of loft insulation. The loft insulation batts and rolls are made from rock, glass or mineral fibre and some of them are foil backed and the rigid batts can be bonded to floor board for easy installation.

Pros
  • Straightforward to install,
  • Easy to cut and fix,
  • Could be a DIY project,
  • Good for insulating accessible spaces,
  • Available eco products such as sheep's wool an recycled glass or bottles.

Cons
  • Some materials can irritate the skin,
  • May need protection wear,
  • Rolls can be too bulky,
  • May not fit in small spaces or around obstructions,
  • Sheep’s wool is more expensive.
Multi foil and reflective insulation

Multi-foil is an insulation material comprising outer layers of coated metallised film, laminated to a non-woven polypropylene fabric enclosing the core and welded along both long edges. The core of the products consists of five layers of polyester fibre wadding separated by four metallised film layers. This reduces the total thickness of insulation needed and to cut installation time. It also stops air leakage by providing an air-tight vapour barrier and restricting air movement.

Pros
  • Straightforward to install,
  • Easy to cut and fix,
  • Could be a DIY project,
  • Has reflective surface on both sides,
  • Can be between rafters to make the loft a living space.
Cons
  • Can be expensive.

Rigid sheet insulation

Rigid sheet insulation is used usually to insulate the walls and sloping sides of the roof, which in turn would allow the loft to be used as living space. These insulation boards are available with a fire-resistant, moisture-resistant additives. They also may have decorative front face.

Pros
  • EPS and XPS polystyrene,
  • PIR rigid boards,
  • Excellent for insulating loft conversions,
  • Can be covered with plasterboard for an attractive finish,
  • High R-value,
  • Easy to cut and install,
  • Greener insulation options - cork, wood, straw board.
Cons
  • Greener insulation options can be expensive.
R-value Comparison Chart for products available at Insulation Shop


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Brand: Knauf Model and Size: 1200x5250mm - 151.20m2
Delivery Time: 3 - 5 days
75mm Knauf Earthwool Rafter Roll is an unfaced, semi-rigid roll of glass mineral wool with extra high thermal performance, designed for friction fitting between rafters. Friction fitting allows rafter spacing to be completely filled, thus eliminating air gap. It is specifically designed for ins..
£2,233.68
£2,680.42 inc VAT
Brand: Knauf Model and Size: 100mm - 13.89m2
Delivery Time: 1 - 2 days
100mm Earthwool Loft Roll 44 is a flexible low density glass mineral wool quilt which is lightweight, flexible, resilient and non-combustible. The rolls are 1140mm wide and partially perforated to produce either 2 rolls 570mm wide or 3 rolls 380mm wide.CHARACTERISTICSLightweight and economic insulat..
£32.08
£38.50 inc VAT
Brand: Knauf Model and Size: 2x11.1m x 1.2m - 26.64m2
Delivery Time: 1 - 2 days
25mm Knauf Earthwool Acoustic Roll is a flexible glass mineral wool quilt which is lightweight, flexible, resilient and non-combustible. The rolls are 1200mm wide and ready cut to produce 2 rolls in 600mm widths. Earthwool Acoustic Roll is manufactured to a minimum density of 10kg/m3. It is spe..
£39.85
£47.82 inc VAT
12 (0e 0s)
Brand: Isover Model and Size: 100mm - 14.13m2
Delivery Time: 1 - 2 days
100mm Isover Spacesaver is a glass mineral wool roll of high quality, perforated along the roll to allow the user the choice of full, half or third width options from a single roll. The strong, resilient and flexible rolls are pre-perforated to 3 x 386mm and 2 x 580mm widths to fit between comm..
£31.15
£37.38 inc VAT
100mm Superglass Multi Roll 44 Loft Insulation
Guide Price
Brand: Superglass Model and Size: 1.2m x 10.1m - 12.12m2
Delivery Time: 2 - 3 days
100mm Superglass Multi Roll 44 Loft Insulation is flexible and lightweight mineral wool product, specially designed for thermal and acoustic loft insulation. Its resilient and non-combustible structure makes it the perfect choice for not only loft insulation but also all other common applications wh..
Guide Price: £45.99
£55.19 inc VAT
100mm URSA 10 Diverso Loft Roll (split 2x570mm or 3x380mm)
Guide Price
Brand: URSA Model and Size: 9500x1140mm - 10.83m2
Delivery Time: 1 - 2 days
100mm URSA 10 Diverso Loft Roll is a lightweight, non-combustible, unfaced glass mineral wool products for use as loft insulation in cold pitched roofs. URSA 10 Diverso Loft roll is perforated to allow it to be split into 2x570mm or 3x380mm wide rolls to match the format for use between joists ..
Guide Price: £27.28
£32.74 inc VAT
100mm URSA 10 Loft Roll (split 2 x 570mm or 3 x 380mm)
Guide Price
Brand: URSA Model and Size: 9500x1140mm - 10.83m2
Delivery Time: 1 - 2 days
100mm URSA 10 Loft Roll is a lightweight, non-combustible, unfaced glass mineral wool products for use as loft insulation in cold pitched roofs. URSA 10 Loft roll is perforated to allow it to be split into 2 x 570mm  or 3 x 380mm wide rolls to match the format for use between joists at 600..
Guide Price: £32.00
£38.40 inc VAT
150mm Rockwool Roll Loft Insulation
Guide Price
Brand: Rockwool Model and Size: 3650x1200mm - 4.38m2
Delivery Time: 3 - 5 days
150mm Rockwool Roll Loft Insulation is a multi-functional medium-density insulation roll, especially designed for improving thermal performance in roofs and lofts, and acoustic performance and sound reduction in suspended ceilings. It can be used in number of different applications in commercial, in..
Guide Price: £77.61
£93.13 inc VAT
Brand: Rockwool Model and Size: 4800x1200mm - 5.76m2
Delivery Time: 3 - 5 weeks
100mm Rockwool RollBatt Loft Insulation is a multi-functional, medium-density lightweight insulation matt, especially designed for improving thermal and acoustic performance, thus reducing fuel consumption and utility bills, when used in roofs, partitions and suspended ceilings. It can be used in nu..
£64.30
£77.16 inc VAT
Brand: Thermafleece Model and Size: 13000x370 - 14.43m2 - Free Delivery
Delivery Time: 2 - 5 working days
Thermafleece CosyWool roll is a versatile low density insulation rich in British sheeps wool, which would give you all round performance and value for money. It contains 75% Sheeps wool, 15% recycled polyester and 10% polyester binder with a high recycled content making it highly environmentall..
£100.84
£121.01 inc VAT
Cellecta FIBREfon Micro 50 roll (pack of 3)
Guide Price
Brand: Cellecta Model and Size: 1.2x7.2m - 8.64m2
Delivery Time: 3 - 5 days
Cellecta FIBREfon Micro 50 roll is sound absorbing wool roll made from a unique polyester fibre which provides very high sound absorption properties. Despite its slim design it provides the same acoustic performance as traditional mineral wool products that is twice as thick, which means t..
Guide Price: £68.05
£81.66 inc VAT
30mm Rockwool RW3 Slab (Prorox SL930) - pack of 15
Guide Price
Brand: Rockwool Model and Size: 1200x600mm - 10.8m2
Delivery Time: 1 - 2 days
30mm Rockwool RW3 Slab (Prorox SL 930) is a semi-rigid resin bonded slab, providing great thermal, acoustic and fire resistance, designed to be used in various applications in floors, walls and roofs, including special applications in industrial buildings for insulation of  ships, offshore plat..
Guide Price: £58.64
£70.37 inc VAT
50mm Rockwool RW5 Universal Insulation Slab (Prorox SL960) - pack of 4
Guide Price
Brand: Rockwool Model and Size: RW5 50mm - 2.88m2
Delivery Time: 2 - 3 days
50mm Rockwool RW5 (Prorox SL960) is a high quality resin bonded rigid slab for a wide range of thermal, acoustic and fire insulation requirements both within buildings and for industry. They are suitable for many applications including thermal insulation for floors, walls, roofs and boiler rooms. Th..
Guide Price: £42.82
£51.38 inc VAT
25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
Guide Price
Brand: Knauf Model and Size: 1200x600 - 14.4m2
Delivery Time: 2 - 3 days
25mm Rocksilk RS45 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foi..
Guide Price: £41.63
£49.96 inc VAT
25mm Rockwool RWA45 Slab (Prorox SL920) - pack of 16
Guide Price
Brand: Rockwool Model and Size: 600x1200mm - 11.52m2
Delivery Time: 3 - 5 weeks
25mm Rockwool RWA45 is a high quality resin bonded flexible slab for a wide range of thermal, acoustic and fire insulation requirements both within buildings and for industry. They are suitable for many applications including thermal insulation for floors, walls, roofs and boiler rooms. The str..
Guide Price: £28.50
£34.20 inc VAT
7 (0e 0s)
50mm Rockwool Flexi Insulation Slab 1200 x 400mm (pack of 12)
Guide Price
Brand: Rockwool Model and Size: 1200x400mm - 5.76m2
Delivery Time: 1 - 2 days
50mm x1200mm x 400mm Rockwool Flexi Insulation Slab is a unique semi-rigid thermal and acoustic insulation product made from volcanic rock. It has a flexible edge, specifically developed using patented technology for a fast and easy, perfect friction fit between timber and metal frame syst..
Guide Price: £30.15
£36.18 inc VAT
Brand: Rockwool Model and Size: 1200x600mm - 8.64m2
Delivery Time: 1 - 2 days
50mm x1200mm x 600mm Rockwool Flexi Insulation Slab is a unique semi-rigid thermal and acoustic insulation product made from volcanic rock. It has a flexible edge, specifically developed using patented technology for a fast and easy, perfect friction fit between timber and metal frame syst..
£42.50
£51.00 inc VAT
5 (11e 0s)
Brand: Knauf Model and Size: 1200x600 - 8.64m2
Delivery Time: 2 - 3 days
50mm Earthwool Flexible is a non-combustible, inorganic rock mineral wool slab, used for thermal and acoustic insulation and specifically designed for installation by friction fitting. Earthwool Flexible is odourless, non-hygroscopic, rot proof, does not sustain vermin and will not encourage th..
£45.31
£54.37 inc VAT
50mm Rocksilk RS100 Universal Insulation Slab Knauf (pack of 6)
Guide Price
Brand: Knauf Model and Size: 1200x600 - 4.32m2
Delivery Time: 2 - 3 days
50mm Rocksilk RS100 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory appli..
Guide Price: £35.43
£42.52 inc VAT
50mm Rocksilk RS60 Universal Insulation Slab Knauf (pack of 9)
Guide Price
Brand: Knauf Model and Size: 1200x600 - 6.48m2
Delivery Time: 1 - 2 days
50mm Rocksilk RS60 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applie..
Guide Price: £41.63
£49.96 inc VAT
Brand: Thermafleece Model and Size: 1200x390mm - 19.66m2- Free delivery
Delivery Time: 2 - 5 working days
Thermafleece CosyWool Flexible Slab is a versatile low density insulation rich in British sheeps wool, which would give you all round performance and value for money. It contains 75% Sheeps wool, 15% recycled polyester and 10% polyester binder with a high recycled content making it highly envir..
£184.90
£221.88 inc VAT
50mm ThermaFleece NatraHemp Flexible Slab 370mm x 1200mm (pack of 48)
Guide Price
Brand: Thermafleece Model and Size: 1200x370mm - 21.31m2
Delivery Time: 2 - 3 days
Thermafleece NatraHemp Flexible Slab is a medium density insulation rich in home-grown hemp fibres and is a safe, efficient and durable alternative when plant fibre is the preferred choice. Hemp is a fast-growing, low-impact plant crop that produces fine fibres suitable for insulation. Hemp fibres a..
Guide Price: £191.08
£229.30 inc VAT
Brand: Thermafleece Model and Size: 1200x390mm - 14.04m2 - Free Delivery
Delivery Time: 2 - 3 days
Thermafleece UltraWool Flexible Slab is a versatile high density insulation rich in British sheeps wool, which would give you all round performance and value for money. It contains 75% Sheeps wool, 15% recycled polyester and 10% polyester binder with a high recycled content making it highly environm..
£174.32
£209.18 inc VAT
Cellecta Fibrefon Micro Slab 15 (pack of 25)
Guide Price
Brand: Cellecta Model and Size: 600x1200mm - 18m2
Delivery Time: 3 - 5 days
Cellecta Fibrefon Micro Slab 15 is composed from a unique polyester fibre material, giving the slab substantial acoustic characteristics and performance, due to significant sound absorption. All these characteristics make them especially applicable to narrow spaces such as between joists in ceiling ..
35mm Actis Triso Super 10+ Multi-Foil Insulation
Guide Price
Brand: Actis Model and Size: 1.6x10m - 16m2
Delivery Time: 2 - 3 days
Actis Triso Super 10+ is a thin multi-foil insulation, comprising of even 19 separate layers, including two metallic films with reinforcing mesh, three wadding layers, eight foam layers and six internal reflective films. It has very wide application, but is most suitable for roof and loft insulation..
Guide Price: £188.20
£225.84 inc VAT
Brand: Low-E Model and Size: 1.25m x 4m - 5m2 - Free Delivery
Delivery Time: 2 - 3 days
5m2 Low-E EZY-Seal Reflective Foil Insulation Roll gives a superior air infiltration barrier that reduces draughts and uncontrolled air movement and also increases thermal performance by blocking up to 97% of radiant heat. It is also a vapour control layer. Low-E EZY-Seal Reflective Foil I..
£45.54
£54.65 inc VAT
Brand: IPP Model and Size: 1.2m x 10m (12m2)
Delivery Time: 2 - 3 days
30mm Alumaflex Multifoil insulation is a sophisticated multi layer radiant barrier of low emissivity. This product comprises 14 layers where the outer layer is a PET (polyethylene terephthalate) fused to a PE (polyethylene) bubble layer which is then fused to a non-woven polypropylene backing. The c..
£92.45
£110.94 inc VAT
Brand: TLX Insulation Model and Size: 1.2m x 10m - 12m2
Delivery Time: 2 - 3 days
30mm TLX Silver Multi-foil is an insulation material comprising outer layers of coated metallised film, laminated to a non-woven polypropylene fabric enclosing the core and welded along both long edges. The core of the products consists of five layers of polyester fibre wadding separated by four met..
£99.89
£119.87 inc VAT
Thinsulex TLX Gold Multifoil Insulation
Guide Price
Brand: TLX Insulation Model and Size: 1.2m x 10m - 12m2
Delivery Time: 2 - 3 days
TLX Gold Thinsulex Multifoil Insulation is a 2 in 1 insulating breather membrane, venting moisture like a breather membrane, whilst insulating like non-breathable PIR board. The key benefit of the product is to improve the thermal performance of a roof without concern of condensation or having to ad..
Guide Price: £182.85
£219.42 inc VAT
Brand: Low-E Model and Size: 65mm x 45m - Free Delivery
Delivery Time: 2 - 3 days
Low-E Seam Tape is a pure aluminium foil tape and has a Class 1 Fire Rating. This tape has a reinforced scrim mesh under the surface of the tape and increases its tensile strength. This tape is manufactured using the highest quality foil and high strength adhesive. Once applied, it will not de-lamin..
£28.76
£34.51 inc VAT
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