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Insulation

Insulation is a great energy saver and comes in various materials. There are many types available including glass wool, fibreglass insulation, polystyrene, pipe and foil insulation. Insulation can and should be used in many areas in your property such as the loft, flooring, cavities and solid wall insulation. 

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  • Celotex XR4000 PIR Insulation Board 1200 x 2400mm Celotex XR4000 PIR Insulation Board 1200 x 2400mm

    Celotex XR4000 PIR Insulation Board 1200 x 2400mm

    £61.33 - £127.58 per sheet (Ex VAT)
    £73.60 - £153.10 per sheet (Inc VAT)
    Celotex XR4110 is a high performance rigid polyisocyanurate (PIR) insulation board that is extremely lightweight making it very easy to handle, transport and extremely easy to install due to its rigid nature. Being a high performance PIR insulation...
  • Polystyrene Flooring Sheets SDN 2400 x 1200mm

    Polystyrene Flooring Sheets SDN 2400 x 1200mm

    £6.00 - £35.96 per sheet (Ex VAT)
    £7.20 - £43.15 per sheet (Inc VAT)
    Expanded polystyrene comes in a wide variety of shapes and sizes. Within the construction industry, 2400 x 1200mm. EPS is a combustible material but providing it is installed correctly in accordance with the manufacturers' instructions, it will not...
  • Celotex CW4000 PIR Cavity Wall Insulation 1200 x 450mm Celotex CW4000 PIR Cavity Wall Insulation 1200 x 450mm

    Celotex CW4000 PIR Cavity Wall Insulation 1200 x 450mm

    £6.34 - £14.60 per sheet (Ex VAT)
    £7.61 - £17.52 per sheet (Inc VAT)
    The Celotex CW4000 range are high performance insulation boards for Cavity Walls. It features low emissivity foil facings giving improved thermal insulation performance within cavity air spaces, when compared to typical PIR products. This PIR insulation...
  • Unilin Thin-R Pitched Roof & Floor Insulation PIR Board 2400 x 1200mm

    Unilin Thin-R Pitched Roof & Floor Insulation PIR Board 2400 x 1200mm

    £18.56 - £101.61 per sheet (Ex VAT)
    £22.27 - £121.93 per sheet (Inc VAT)
    Unilin / Xtratherm XT Thermal Liner MF Insulation PIR Board is a composite insulated panel of Unilin / Xtratherm PIR insulation core with a composite foil facing bonded to 12.5mm tapered edge plasterboard for internal walls, sloped roofs and ceilings...
  • Rockwool Sound Insulation Slab 1200 x 400mm Rockwool Sound Insulation Slab 1200 x 400mm

    Rockwool Sound Insulation Slab 1200 x 400mm

    £37.96 - £40.21 per pack (Ex VAT)
    £45.55 - £48.25 per pack (Inc VAT)
    Rockwool Sound Insulation Slab 400 x 1200mm A1 Fire resilient stone wool insulation slabs optimised for sound proofing. ROCKWOOL Sound Slab is used to create quiet, peaceful and comfortable spaces in both residential and commercial environments. Being...
  • ISOVER Spacesaver Wool Insulation Loft Roll ISOVER Spacesaver Wool Insulation Loft Roll

    ISOVER Spacesaver Wool Insulation Loft Roll

    £48.92 - £58.05 per roll (Ex VAT)
    £58.70 - £69.66 per roll (Inc VAT)
    ISOVER Spacesaver is a glass mineral wool roll available in a range of thicknesses from 100-200mm, and supplied pre-perforated to 3 x 386mm and 2 x 580mm width to fit between common joists. The economical and easy-to-install glass mineral wool rolls are...
  • Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm

    Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm

    £29.34 - £39.32 per pack (Ex VAT)
    £35.21 - £47.18 per pack (Inc VAT)
    Rockwool RWA45 Insulation Slabs 600 x 1200mm is a A1 stone wool insulation for general building applications. ROCKWOOL RWA45 is a general building slab designed for use as acoustic, thermal and fire protection of walls, ceilings, floors and roofs. The...
  • Rockwool Thermal Insulation Roll 2750 x 1200 x 100mm

    Rockwool Thermal Insulation Roll 2750 x 1200 x 100mm

    The Rockwool Thermal Insulation Roll 100 x 1200 x 2750mm is a A1 fire rated mid-density insulation roll designed for use in lofts. ROCKWOOL Thermal Insulation Roll is designed to increase home comfort and save energy, by insulating one of the most...
  • ISOVER APR 1200 Acoustic Partition Insulation Loft Roll (2 x 600mm)

    ISOVER APR 1200 Acoustic Partition Insulation Loft Roll (2 x 600mm)

    £62.04 - £84.98 per roll (Ex VAT)
    £74.45 - £101.98 per roll (Inc VAT)
    Isover Acoustic Partition Roll (APR 1200) provides high levels of acoustic insulation in partitions, walls and floors to meet requirements in domestic and non-residential buildings. A glass mineral wool roll providing high levels of acoustic insulation...
  • Rockwool Sound Insulation Slab 1200 x 600mm Rockwool Sound Insulation Slab 1200 x 600mm

    Rockwool Sound Insulation Slab 1200 x 600mm

    £57.27 - £62.87 per pack (Ex VAT)
    £68.72 - £75.44 per pack (Inc VAT)
    Nuisance noise doesn’t always come from external sources. Whether in a living or working environment, controlling the passage of sound between internal spaces can make the difference between a peaceful experience… or a much more stressful one. The...
  • Celotex PL4000 Thermal PIR Insulation Board 1200 x 2400mm Celotex PL4000 Thermal PIR Insulation Board 1200 x 2400mm

    Celotex PL4000 Thermal PIR Insulation Board 1200 x 2400mm

    £57.60 - £74.66 per sheet (Ex VAT)
    £69.12 - £89.59 per sheet (Inc VAT)
    Celotex PL4000 range is an easy to install rigid polyisocyanurate (PIR) insulation board with a paper facing, laminated to a sheet of 12.5mm plasterboard with a tapered edge. This combination board of plasterboard and insulation saves time and hassle on...
  • Unilin XT Thermal Liner DD Insulation PIR Board 2400 x 1200mm

    Unilin XT Thermal Liner DD Insulation PIR Board 2400 x 1200mm

    £44.79 - £67.61 per sheet (Ex VAT)
    £53.75 - £81.13 per sheet (Inc VAT)
    Unilin / Xtratherm XT Thermal Liner is specifically designed to create a thermal break in the building envelope and provide a maximum level of insulation with minimal acoustic impact. It is perfectly suited to modern constructions projects where high...
  • Celotex GA4000 PIR Insulation Board 1200 x 2400mm Celotex GA4000 PIR Insulation Board 1200 x 2400mm

    Celotex GA4000 PIR Insulation Board 1200 x 2400mm

    £28.21 - £60.53 per sheet (Ex VAT)
    £33.85 - £72.64 per sheet (Inc VAT)
    Celotex GA4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 50mm to 100mm, it can be considered for roof, wall and floor...
  • Celotex TB4030 PIR Insulation Board Celotex TB4030 PIR Insulation Board

    Celotex TB4030 PIR Insulation Board

    £18.79 - £30.42 (Ex VAT)
    £22.55 - £36.50 (Inc VAT)
    Celotex TB4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 20mm to 40mm, it can be considered for floor, wall and roof...
  • Celotex Thermaclass Cavity Wall 21 Insulation 1190 x 450mm

    £16.09 - £25.02 per sheet (Ex VAT)
    £19.31 - £30.02 per sheet (Inc VAT)
    Thermaclass Cavity Wall 21 is an easy to install, polyisocyanurate (PIR) insulation board for full fill cavity wall applications, with excellent thermal performance (0.021 W/m.K). Featuring a low emissivity foil facing, it can be installed with up to a...
  • ISOVER Cavity Wall Slab 34 ISOVER Cavity Wall Slab 34

    ISOVER Cavity Wall Slab 34

    £156.12 - £156.64 per pack (Ex VAT)
    £187.34 - £187.97 per pack (Inc VAT)
    ISOVER Cavity Wall Slab (CWS) 34 is a BBA certified glass mineral wool slab, made from 75% recycled glass. Cavity Slab 34 offers exceptional thermal performance in external masonry cavity walls and with thermal conductivity of 0.034 W/m.K. it can reduce...
  • ISOVER Cavity Wall Slab 36 455 x 1200mm (Various Thickness)

    ISOVER Cavity Wall Slab 36 455 x 1200mm (Various Thickness)

    £42.66 - £57.34 per pack (Ex VAT)
    £51.19 - £68.81 per pack (Inc VAT)
    ISOVER Cavity Wall Slab 36 is a glass mineral wool slab supplied in 50-150mm thicknesses. The strong, resilient, and flexible batts are 455mm wide to fit between standard wall tie spacing, for warmer rooms and greater occupant comfort.
  • ISOVER RD Party Wall Insulation Roll ISOVER RD Party Wall Insulation Roll

    ISOVER RD Party Wall Insulation Roll

    £66.20 - £70.57 per roll (Ex VAT)
    £79.44 - £84.68 per roll (Inc VAT)
    The ISOVER RD Party Wall glass mineral wool roll is a cost effective acoustic insulation used to reduce the passage of sound across a masonry party wall and minimise the air movement within the cavity, improving its thermal performance. Available in a...
  • ISOVER Slab 32 Cavity Wall Insulation 455 x 1200mm

    ISOVER Slab 32 Cavity Wall Insulation 455 x 1200mm

    £58.62 - £78.46 per pack (Ex VAT)
    £70.34 - £94.15 per pack (Inc VAT)
    ISOVER Cavity Wall Slab (CWS) 32 is a BBA certified glass mineral wool slab that is made from 75% recycled glass. Cavity Slab 32 offers exceptional thermal performance in external masonry cavity walls, with a thermal conductivity of 0.032 W/m.K. hence...
  • Rockwool Flexi Thermal Acoustic Insulation Slab 1200 x 400mm

    Rockwool Flexi Thermal Acoustic Insulation Slab 1200 x 400mm

    £39.50 - £42.74 per pack (Ex VAT)
    £47.40 - £51.29 per pack (Inc VAT)
    Rockwool FLEXI® 400 x 1200mm is a A1 multi use, dual purpose thermal and acoustic insulation product that offers perfect friction fit for framed constructions. ROCKWOOL FLEXI® is a unique, flexible edged insulation product, developed using patented...
  • Rockwool Flexi Thermal Acoustic Insulation Slab 1200 x 600mm

    Rockwool Flexi Thermal Acoustic Insulation Slab 1200 x 600mm

    £55.68 - £79.24 per pack (Ex VAT)
    £66.82 - £95.09 per pack (Inc VAT)
    Rockwool FLEXI® 100 x 600 x 1200mm is an A1 insulation slab that offers perfect friction fit for framed constructions. ROCKWOOL FLEXI® is a unique, flexible edged insulation product, developed using patented technology for a fast and easy, secure...
  • Rockwool Full Fill Cavity Batt Insulation 1200 x 455mm

    Rockwool Full Fill Cavity Batt Insulation 1200 x 455mm

    £45.79 - £56.96 per pack (Ex VAT)
    £54.95 - £68.35 per pack (Inc VAT)
    The Rockwool Full Fill Cavity Batt 455 x 1200mm is a A1 insulation slab for masonry cavity walls. ROCKWOOL® Cavity insulation is a full-fill insulation solution for masonry cavity wall construction, suitable for use in new builds and extensions...
  • Rockwool PWCB Party Wall Cavity Barrier Insulation 1200 x 200mm

    Rockwool PWCB Party Wall Cavity Barrier Insulation 1200 x 200mm

    £170.54 - £232.97 per pack (Ex VAT)
    £204.65 - £279.56 per pack (Inc VAT)
    Rockwool Party Wall Cavity Barriers or PWCBs, work to improve a building’s safety by preventing the spread of fire within concealed voids. By specifying and installing the TCB Cavity Barrier or PWCB Cavity Barrier, they provide essential protection...
  • Rockwool RW3 Acoustic Insulation Slab 1200 x 600mm

    Rockwool RW3 Acoustic Insulation Slab 1200 x 600mm

    £38.24 - £48.53 per pack (Ex VAT)
    £45.89 - £58.24 per pack (Inc VAT)
    Rockwool RW3 Acoustic 600 x 1200mm insulation slab is a A1 fire rated a stone wool insulation slab for general building applications. ROCKWOOL RW3 is a general building slab designed for use as acoustic, thermal and fire protection of walls, ceilings,...

Insulation

Insulation is an effective way to save energy in your home or property, as it helps to prevent draughts as well as energy from depleting out of the building, ultimately wasting money. Insulating your loft or attic is a simple and effective way to reduce heat loss and reduce your overall heating bill. Loft insulation is effective for at least 40 years.

Whilst saving energy is the most common incentive for home and property owners, there are many other reasons as to why you might want to install insulation. Insulation can prevent sound from travelling either around your home or between you and neighbouring houses. Good insulation also helps to prevent mould and condensation from appearing in your home, which is often caused by the differing temperatures of your internal and external walls. Insulation can also form part of your home’s resistance against the quick spread of fire.

There are a variety of different insulation products that we offer at Howarth and knowing which one to purchase will be determined by where you wish to use it and what you want to achieve from it, such as:

Glass wool, which is suitable for lofts and a variety of walls. Glass wool is manufactured from recycled glass, and it is not combustible, so it is ideal for offering both acoustic and thermal performance, as well as being water-resistant. It can also act as a cavity wall insulation, which means that it will trap the air in the insulation material that has been injected into the cavity. The clever use of materials helps trap warm air and prevent air circulating. As a result, heat loss is prevented using conduction and convection.

PIR boards are a rigid insulation board that can be used in walls, flooring, and lofts.

Polystyrene is ideal for walls, flooring and under concrete. It offers an excellent thermal insulator property as an insulation board, and it is also very easy to work with.

Rockwool is a stone-based insulation, which is suitable for cavities, partitions, and external walls, as well as floors and lofts.

Pipe insulation is used to insulate all hot and cold-water pipes, including radiators and boiler systems. These are designed to prevent pipes from freezing during the cooler months.

For further information and expert advice about insulation, please contact your friendly local Howarth branch.

Frequently Asked Questions

How thick should loft insulation be?
The recommended depth for loft isolation is 270 millimetres for glass wool, 250 millimetres for rock wool, or 220 millimetres for cellulose.
How much is loft insulation?
The average loft insulation cost is between £5 and £11 per square metre. This means that it should cost no more than about £1250 to insulate a 4-bedroom detached home.
Is loft insulation flammable?
Loft insulation is non-combustible.
What is loft insulation made of?
Loft insulation is made of glass fibre, sheep’s wool, hemp, or recycled polyester.

How to guides

Insulation for every application

Unsure how to keep your keep your heating costs down? Read this article on types of insulation and more.

What is the Green Homes Grant?

The £2 billion grant aims to encourage homeowners to make their homes more energy efficient, benefitting the environment as well as protecting and creating jobs.

How to insulate a shed

Where do you start when it comes to insulating your shed? Click on this article to find out more.

Celotex Insulation

What is Celotex? A guide on what Celotex Insulation is and how its used around your home.

Isover Insulation

Isover Insulation - Learn more about Isover and their types of insulation boards.

How to insulate a garage

A step-by-step guide on how to insulate your garage.