Loft & Underfloor Insulation

Now is the best time to upgrade your loft or underfloor (suspended timber) insulation for the winter months. View our collection of insulation and accessories.
Loft & Underfloor Insulation
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Price: 0 – £379.90
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  • LOFT LEG Loft Flooring Legs - Raise Loft Boards by 175mm (12 per box) LOFT LEG Loft Flooring Legs - Raise Loft Boards by 175mm (12 per box)
    Sale 9%
    Summer Specials
    LOFT LEG by Loft Leg

    LL/LFL

    LOFT LEG Loft Flooring Legs - Raise Loft Boards by 175mm (12 per box)

    £14.45
    £1.20 per ea
    £12.04 ex. VAT
    £1.00 per ea
    £14.45
    £1.20 per ea
    £15.90 you save £1.45
    £12.04 ex. VAT
    £1.00 per ea
    £13.25 you save £1.21
  • LOFT LEG XL Loft Flooring Legs - Raise Loft Boards by 300mm (12 per box) LOFT LEG XL Loft Flooring Legs - Raise Loft Boards by 300mm (12 per box)
    Sale 9%
    Summer Specials
    LOFT LEG by Loft Leg

    LL/LFLXL

    LOFT LEG XL Loft Flooring Legs - Raise Loft Boards by 300mm (12 per box)

    £17.41
    £1.45 per ea
    £14.51 ex. VAT
    £1.21 per ea
    £17.41
    £1.45 per ea
    £19.15 you save £1.74
    £14.51 ex. VAT
    £1.21 per ea
    £15.96 you save £1.45
  • COROTOP Light - Breathable Membrane - 1m x 50m (50m²) COROTOP Light - Breathable Membrane - 1m x 50m (50m²)
    LIGHT by Corotop - Membranes

    FAK/CORLI

    COROTOP Light - Breathable Membrane - 1m x 50m (50m²)

    £36.90
    £0.73 per m²
    £30.75 ex. VAT
    £0.62 per m²
    £36.90
    £0.73 per m²
    you save £-36.90
    £30.75 ex. VAT
    £0.62 per m²
    £0.00 you save £-30.75
  • Insulation Support Netting - 1m x 100m
    SUPPORT NETTING by Insulation Merchant

    UIS/MESHNET-1001

    Insulation Support Netting - 1m x 100m

    £23.90
    £0.23 per m²
    £19.92 ex. VAT
    £0.20 per m²
    £23.90
    £0.23 per m²
    you save £-23.90
    £19.92 ex. VAT
    £0.20 per m²
    £0.00 you save £-19.92
  • Insulation Support Netting - 2m x 100m
    SUPPORT NETTING by Insulation Merchant

    UIS/MESHNET-1002

    Insulation Support Netting - 2m x 100m

    £47.90
    £0.23 per m²
    £39.92 ex. VAT
    £0.20 per m²
    £47.90
    £0.23 per m²
    you save £-47.90
    £39.92 ex. VAT
    £0.20 per m²
    £0.00 you save £-39.92
  • 100mm Superglass Multi-Roll 44 | Insulation Merchant 100mm Superglass Multi-Roll 44 | Insulation Merchant
    MULTI-ROLL 44 by Superglass

    SG/MR44-100

    100mm Superglass Multi-Roll 44

    £33.20
    £2.74 per m²
    £27.67 ex. VAT
    £2.28 per m²
    £33.20
    £2.74 per m²
    you save £-33.20
    £27.67 ex. VAT
    £2.28 per m²
    £0.00 you save £-27.67
  • 150mm Superglass Multi-Roll 44 | Insulation Merchant 150mm Superglass Multi-Roll 44 | Insulation Merchant
    MULTI-ROLL 44 by Superglass

    SG/MR44-150

    150mm Superglass Multi-Roll 44

    £31.70
    £4.11 per m²
    £26.42 ex. VAT
    £3.42 per m²
    £31.70
    £4.11 per m²
    you save £-31.70
    £26.42 ex. VAT
    £3.42 per m²
    £0.00 you save £-26.42
  • 200mm Superglass Multi-Roll 44 | Insulation Merchant 200mm Superglass Multi-Roll 44 | Insulation Merchant
    MULTI-ROLL 44 by Superglass

    SG/MR44-200

    200mm Superglass Multi-Roll 44

    £30.90
    £5.49 per m²
    £25.75 ex. VAT
    £4.58 per m²
    £30.90
    £5.49 per m²
    you save £-30.90
    £25.75 ex. VAT
    £4.58 per m²
    £0.00 you save £-25.75
  • 100mm Superglass Multi-Roll 40 | Insulation Merchant 100mm Superglass Multi-Roll 40 | Insulation Merchant
    MULTI-ROLL 40 by Superglass

    SG/MR40-100

    100mm Superglass Multi-Roll 40

    £37.50
    £3.21 per m²
    £31.25 ex. VAT
    £2.67 per m²
    £37.50
    £3.21 per m²
    you save £-37.50
    £31.25 ex. VAT
    £2.67 per m²
    £0.00 you save £-31.25
  • 150mm Superglass Multi-Roll 40 | Insulation Merchant 150mm Superglass Multi-Roll 40 | Insulation Merchant
    MULTI-ROLL 40 by Superglass

    SG/MR40-150

    150mm Superglass Multi-Roll 40

    £ Looking for a price?

    Add to a quote for our best rate.

  • 200mm Superglass Multi-Roll 40 | Insulation Merchant 200mm Superglass Multi-Roll 40 | Insulation Merchant
    MULTI-ROLL 40 by Superglass

    SG/MR40-200

    200mm Superglass Multi-Roll 40

    £44.90
    £8.41 per m²
    £37.42 ex. VAT
    £7.01 per m²
    £44.90
    £8.41 per m²
    you save £-44.90
    £37.42 ex. VAT
    £7.01 per m²
    £0.00 you save £-37.42
  • 50mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 570mm (5.47m²) | Insulation Merchant 50mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 570mm (5.47m²) | Insulation Merchant
    Autumn Offers
    INDITHERM HEMP - 570 by IndiNature®

    IN/TH4057-50

    50mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 570mm (5.47m²)

    £42.98
    £7.86 per m²
    £35.82 ex. VAT
    £6.55 per m²
    £42.98
    £7.86 per m²
    you save £-42.98
    £35.82 ex. VAT
    £6.55 per m²
    £0.00 you save £-35.82
  • IndiNature IndiTherm Hemp Flexibatt Insulation | Insulation Merchant IndiNature IndiTherm Hemp Flexibatt Insulation | Insulation Merchant
    Autumn Offers
    INDITHERM HEMP - 570 by IndiNature®

    IN/TH4057-100

    100mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 570mm (2.74m²)

    £42.98
    £15.69 per m²
    £35.82 ex. VAT
    £13.07 per m²
    £42.98
    £15.69 per m²
    you save £-42.98
    £35.82 ex. VAT
    £13.07 per m²
    £0.00 you save £-35.82
  • 50mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 370mm (3.55m²) | Insulation Merchant 50mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 370mm (3.55m²) | Insulation Merchant
    Autumn Offers
    INDITHERM HEMP - 370 by IndiNature®

    IN/TH4037-50

    50mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 370mm (3.55m²)

    £27.90
    £7.86 per m²
    £23.25 ex. VAT
    £6.55 per m²
    £27.90
    £7.86 per m²
    you save £-27.90
    £23.25 ex. VAT
    £6.55 per m²
    £0.00 you save £-23.25
  • IndiNature IndiTherm Hemp Flexibatt Insulation | Insulation Merchant IndiNature IndiTherm Hemp Flexibatt Insulation | Insulation Merchant
    Autumn Offers
    INDITHERM HEMP - 370 by IndiNature®

    IN/TH4037-100

    100mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 370mm (1.78m²)

    £27.90
    £15.67 per m²
    £23.25 ex. VAT
    £13.06 per m²
    £27.90
    £15.67 per m²
    you save £-27.90
    £23.25 ex. VAT
    £13.06 per m²
    £0.00 you save £-23.25
  • 100mm Thermafleece CosyWool Sheep Wool (3 x 370mm rolls) | Insulation Merchant 100mm Thermafleece CosyWool Sheep Wool (3 x 370mm rolls) | Insulation Merchantv
    Autumn Offers
    COSYWOOL by Thermafleece

    TF/COSY-100x370

    100mm Thermafleece CosyWool Sheep Wool (3 x 370mm rolls)

    £96.80
    £13.41 per m²
    £80.67 ex. VAT
    £11.17 per m²
    £96.80
    £13.41 per m²
    you save £-96.80
    £80.67 ex. VAT
    £11.17 per m²
    £0.00 you save £-80.67
  • 100mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls) | Insulation Merchant 100mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls) | Insulation Merchant
    Autumn Offers
    COSYWOOL by Thermafleece

    TF/COSY-100x570

    100mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls)

    £99.35
    £13.41 per m²
    £82.79 ex. VAT
    £11.17 per m²
    £99.35
    £13.41 per m²
    you save £-99.35
    £82.79 ex. VAT
    £11.17 per m²
    £0.00 you save £-82.79
  • 150mm Thermafleece CosyWool Sheep Wool (3 x 370mm rolls) | Insulation Merchant 150mm Thermafleece CosyWool Sheep Wool (3 x 370mm rolls) | Insulation Merchant
    Autumn Offers
    COSYWOOL by Thermafleece

    TF/COSY-150x370

    150mm Thermafleece CosyWool Sheep Wool (3 x 370mm rolls)

    £95.99
    £20.12 per m²
    £79.99 ex. VAT
    £16.77 per m²
    £95.99
    £20.12 per m²
    you save £-95.99
    £79.99 ex. VAT
    £16.77 per m²
    £0.00 you save £-79.99
  • 150mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls) | Insulation Merchant 150mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls) | Insulation Merchant
    Autumn Offers
    COSYWOOL by Thermafleece

    TF/COSY-150x570

    150mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls)

    £98.60
    £20.12 per m²
    £82.17 ex. VAT
    £16.77 per m²
    £98.60
    £20.12 per m²
    you save £-98.60
    £82.17 ex. VAT
    £16.77 per m²
    £0.00 you save £-82.17
  • Knauf Loft Roll 44 | Insulation Merchant Knauf Loft Roll 44 | Insulation Merchant
    Black Friday
    Black Friday Daily Deal
    Free Shipping
    LOFT ROLL by Knauf Insulation

    KNI/LOFT44-100

    100mm Knauf Loft Roll 44 (Combi-Cut)

    £38.82
    £2.79 per m²
    £32.35 ex. VAT
    £2.33 per m²
    £38.82
    £2.79 per m²
    you save £-38.82
    £32.35 ex. VAT
    £2.33 per m²
    £0.00 you save £-32.35