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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: Rockwool Model and Size: 2750x1200mm - 6.60m2
Delivery Time: 2 - 3 working days
100mm Rockwool Twin Roll is a fire resistant, non-combustible, medium density mineral wool insulation with high acoustic properties. The roll is manufactured as one 200mm roll, and is pre-cut down the middle to create the option of two 100mm rolls as one package. Rockwool Twinroll is the insulation ..
Guide Price: £70.56
£84.67 inc VAT
Brand: YBS Insulation Model and Size: 1.2m x 10m - 12m2 - Free delivery
Delivery Time: 1-3 working days
15mm EcoQuilt Expert is a flexible, easy to install, 1.2m wide multi-layer insulation blanket for roofs, walls & floors that effectively deals with all forms of energy transfer, offering tremendous thermal benefits. It consists of 6 layers of material including reflective foil on both sides and ..
£95.68
£114.82 inc VAT
Brand: YBS Insulation Model and Size: 1.2m x 10m - 12m2 - Free delivery
Delivery Time: 3 - 5 days
40mm YBS BreatherQuilt is a flexible, easy to install, multi-layer breathable insulation that gives a high level of thermal performance, and also effectively deals with condensation and all forms of energy transfer. Consists of 11 layers. The YBS Breather Quilt is a thermal insulation in a 40mm thin..
£125.77
£150.92 inc VAT
Brand: YBS Insulation Model and Size: 1.2m x 10m - 12m2 - Free delivery
Delivery Time: 1-3 working days
40mm YBS SuperQuilt is a flexible, easy to install, 1.2m wide multi-layer insulation blanket for roofs, walls & floors that effectively deals with all forms of energy transfer, offering tremendous thermal benefits. It consists of 19 layers of material including reflective foil, expanded polyethy..
£129.52
£155.42 inc VAT
Brand: Actis Model and Size: 6.25x1.6m - 10.00m2
Delivery Time: 2 - 3 working days
45mm Actis HControl Hybrid is a thin multi-foil insulation that combines insulation, air tightness, moisture resistance and reflective properties. Actis HControl Hybrid blocks the water vapour diffusion through the fabric of the building, preventing the risk of condensation. As it is airtight, ..
£73.57
£88.28 inc VAT
Model and Size: 1.5m x 10m - 15m2 - Free delivery
Delivery Time: 1-3 working days
45mm EcoQuilt 45 is a flexible, easy to install, 1.5m wide multi-layer insulation blanket for roofs, walls & floors that effectively deals with all forms of energy transfer, offering tremendous thermal benefits. It consists of 11 layers of material including reflective foil on both sides and wil..
£123.58
£148.30 inc VAT
45mm SuperFOIL Multi-layer Foil Insulation SF19 Plus - 1.2m x 10m Roll
Guide Price
Brand: SuperFOIL Model and Size: 1.2m x 10m - 12m2
Delivery Time: 2 - 3 working days
45mm SuperFOIL Multi-layer Foil Insulation SF19+ is a multi layer air seal and radiant barrier that can be used over rafter or under rafter in roofs and also on walls. Superfoil SF19+ is manufactured with 40% recycled materials and is recyclable at the end of its useful life..
Guide Price: £97.20
£116.64 inc VAT
Brand: YBS Insulation Model and Size: 1.05m x 25m - 26.25m2 - Free delivery
Delivery Time: In Stock 1-2 working days
4mm YBS YBS Airtec Double is a flexible, easy to install, multi-layer reflective aluminium foil air bubble insulation membrane in between hat acts like airtight vapour control layer. The core bubble profile offers thermal benefits by trapping air within its bubble structure while creating low e..
£73.00
£87.60 inc VAT
Brand: Actis Model and Size: 1145mm x 1200mm - 5.5m2
Delivery Time: 2 - 3 working days
50mm Actis Hybris Panel is a multi-foil insulation featuring a unique and flexible honeycomb structure that combines insulation, air tightness, moisture resistance and reflective properties. The low-emmissivity honeycomb structure is protected from excessive dust and air movements. Actis Hybris..
Guide Price: £28.64
£34.37 inc VAT
Brand: Rockwool Model and Size: 1000mm x 610mm - 7.32m2
Delivery Time: 1 - 2 days
50mm Rockwool Rocton Slabs are a reliable and durable non-flammable insulation solution for universal use. These high density slabs can be used in partition walls, curtain walls, within steel and timber frame structures, over ceilings and between floor joists. Rockwool Rocton has the highest so..
Brand: Thermafleece Model and Size: 390mm x 10m - 11.7m2
Delivery Time: 2 - 3 working days
Thermafleece SupaSoft offers a safe, sustainable and cost effective way to insulate your loft. It contains 100% recycled polyester and is made almost entirely from recycled plastic bottles. SupaSoft contains no harmful chemicals or binders and is completely safe to handle. It can be used to ins..
Guide Price: £50.04
£60.05 inc VAT
90mm Actis Hybris Panel - Reflective Multifoil Insulation - 1145mm x 1200mm - pack of 4 90mm Actis Hybris Panel - Reflective Multifoil Insulation - 1145mm x 1200mm - pack of 4
Guide Price
Brand: Actis Model and Size: 1145mm x 1200mm - 5.5m2
Delivery Time: 2 - 3 working days
90mm Actis Hybris Panel is a multi-foil insulation featuring a unique and flexible honeycomb structure that combines insulation, air tightness, moisture resistance and reflective properties. The low-emmissivity honeycomb structure is protected from excessive dust and air movements. Actis Hybris..
Guide Price: £42.50
£51.00 inc VAT
Brand: Knauf Model and Size: 4.5m x 1.4m - 123.2m2
Delivery Time: 2 - 3 weeks
90mm Knauf Earthwool FrameTherm Roll is a lightweight, flexible, resilient and non-combustible glass mineral wool quilt, used for friction fitting between timber studs and rafters. The rolls are 1140mm wide and ready cut to produce 3 rolls in 380mm widths. It is specifically designed for friction fi..
Brand: DuPont Tyvek Model and Size: 1.5x50m - 75m2
Delivery Time: 1 - 2 days
DuPont AirGuard Reflective is an air and vapour control layer that is 100% air tight. It has a metallised surface with a very low emissivity internal vapour barrier that can enhance thermal comfort by reflecting up to 95% of radiant heat back into the building. It is usually installed with an air ga..
Brand: Low-E Model and Size: 1.25m x 24m - 30m2 - Free Delivery
Delivery Time: 1-3 working days
Low-E Micro-E Perforated gives you all the benefits of a reflective foil insulation, but the perforations are designed to allow moisture to pass through the product while limiting air movement. Low-E Perforated is recommended for use on the external sides of an insulati..
£160.79
£192.95 inc VAT
Brand: Low-E Model and Size: 1.25m x 24m - 30m2 - Free Delivery
Delivery Time: 2 - 3 working days
30m2 Low-E Micro-E 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. Micro-E Reflective Foil Insulati..
£160.79
£192.95 inc VAT
Brand: Low-E Model and Size: 1.25m x 4m - 5m2 - Free Delivery
Delivery Time: 1-3 working days
Low-E Perforated Reflective Foil Insulation gives you all the benefits of a reflective foil insulation, but the perforations are designed to allow moisture to pass through the product while limiting air movement. Low-E Perforated is recommended for use on the external sides of an insulation system a..
£44.69
£53.63 inc VAT
Brand: Low-E Model and Size: 416mm x 24m - 10m2 - Free Delivery
Delivery Time: 1-3 working days
10m2 Low-E Tab 16 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 Tab Reflective Foil Insulation&n..
£69.37
£83.24 inc VAT
Brand: Low-E Model and Size: 1.25m x 12m - 15m2 - Free Delivery
Delivery Time: 1-3 working days
15m2 Low-E Ultra-E Reflective Foil Insulation Roll is a 11mm thick superior vapour control barrier that greatly reduces noise transmission, while the pure aluminium facings still reflect up to 97% of radiant heat. Low-E Ultra-E Reflective Foil Insulation is totally non-toxic and with no fibres,..
£151.88
£182.26 inc VAT
Thermafleece Breather Membrane - 25m2 roll - length 16.7m.
Guide Price
Brand: Thermafleece Model and Size: 16.7m x 1.5m - 25m2 - Free Delivery
Delivery Time: 3 - 5 days
Thermafleece Breather Membrane  is a light weight vapour permeable underlay for use in floors and walls or on top of insulation as a protective layer. Thermafleece Breather Membrane is lightweight and easy to handle membrane comprises of 3 layers; two outer layers made from a non..
Guide Price: £50.50
£60.60 inc VAT
Model and Size: 100L
Delivery Time: 1 - 2 days
Vermiculite Micafil is as an excellent thermal insulating material capable of withstanding temperatures in excess of 1000C. Its nominal particle size is between 2 -15mm. Vermiculite Micafil with its free flowing properties of loose-fill, make it an excellent insulation for lofts. Micafil significant..
Guide Price: £25.50
£30.60 inc VAT
Brand: Isomass Model and Size: 2400mm x 1200mm - 2.88m2
Delivery Time: 3 - 5 days
37.5mm Isocheck Isoliner Thermal Laminate Board comprise a 25mm rigid PIR foam insulation board bonded to a 12.5mm tapered edge Gyproc SoundBloc. On the reverse face, the insulation has a multi-layer kraft paper and aluminium facing. This board can be used to line walls and ceilings. It can be ..
Brand: Unilin Insulation (formerly known as Xtratherm) Model and Size: 1200mm x 2400mm - 2.88m2
Delivery Time: 1-3 working days
37.5mm Unilin XT/TL Thermal Liner Dot and Dab Insulated Plasterboard is a high performance rigid insulation board made from 25mm Unilin PIR core faced with composite kraft paper bonded to 12.5mm plasterboard, specially designed for internal walls dry lining and insulation, due to its close..
Guide Price: £57.10
£68.52 inc VAT
50mm Knauf Omnifit 35 - Multipurpose Glass Wool Insulation Slab - 1200mm x 400mm (pack of 12)
Guide Price
Brand: Knauf Model and Size: 1200mm x 400mm - 5.76m2
Delivery Time: 2 - 5 working days
50mm Knauf Omnifit 35 Glass Wool Slabs are rigid multipurpose, flexible, non-combustible glass mineral wool slab that is designed for friction fitting installation at 400mm spacings. It has excellent thermal, acoustic, and fire resistance. The sound absorption qualities of Knauf Omnifit slabs are re..
Brand: Knauf Model and Size: 1200mm x 600mm - 8.64m2
Delivery Time: 2 - 5 working days
50mm Knauf Omnifit 35 Glass Wool Slabs are rigid multipurpose, flexible, non-combustible glass mineral wool slab that is designed for friction fitting installation at 600mm spacings. It has excellent thermal, acoustic, and fire resistance. The sound absorption qualities of Knauf Omnifit slabs are re..
Brand: Rockwool Model and Size: 1200mm x 600mm - 4.80m2
Delivery Time: 1 - 2 weeks
50mm Rockwool Ventirock F Plus Rainscreen Slab is a dual-density rigid insulation, used where façade safety is important. As it has a higher density, it can be used for walls with increased fire requirements. Thanks to high resistance to water absorption, the problems of wetting during wor..
50mm Rockwool Ventirock F Super Dual-Density Rainscreen Slab - 1000mm x 600mm - pack of 4
Guide Price
Brand: Rockwool Model and Size: 1000mm x 600mm - 2.40m2
Delivery Time: 1 - 2 weeks
50mm Rockwool Ventirock F Super Rainscreen Slab is a dual-density rigid insulation, used where façade safety is important. As it has a higher density, it can be used for walls with increased fire requirements. Thanks to high resistance to water absorption, the problems of wetting during wo..
Brand: Rockwool Model and Size: 1000mm x 600mm - 2.40m2
Delivery Time: 1 - 2 weeks
50mm Rockwool Ventirock Super Rainscreen Slab is a dual-density rigid insulation, used where façade safety is important. As it has a higher density, it can be used for walls with increased fire requirements. Thanks to high resistance to water absorption, the problems of wetting during work..
Model and Size: 55cm x 55 cm
Delivery Time: In Stock 1-2 working days
55cm x 55cm HatchThatch is an innovative product that seals around your loft hatch to prevent draughts that save on your energy bill by keeping heat in. Simple to install on the loft hatch and fits snugly to stop warm air from leaving and cold air from coming in. The hollow fibres in HatchThatch tra..
£45.50
£54.60 inc VAT
Brand: Ramco Industries Limited Model and Size: 2440x1220mm - 2.98m2
Delivery Time: 3 - 5 days
6mm Ramco HiCem is a high performance multipurpose fibre cement building board used internally and externally and also on floors and under the soffits. This rigid fibre cement board has high flexural strength, impact strength and durability. Ramco HiCem is non-combustible, water resistant and a..
Guide Price: £23.60
£28.32 inc VAT
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