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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  • LOFT LEG Loft Flooring Legs - Raise Loft Boards by 175mm (12 per box) | Insulation Merchant LOFT LEG Loft Flooring Legs - Raise Loft Boards by 175mm (12 per box) | Insulation Merchant
    Sale 9%
    LOFT LEG by Loft Leg

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

    £14.45 inc. VAT
    £1.20 per ea
    £12.04 ex. VAT
    £1.00 per ea
    £14.45 inc. VAT
    £1.20 per ea
    £15.90 Save £1.45
    £12.04 ex. VAT
    £1.00 per ea
    £13.25 Save £1.21
  • LOFT LEG XL Loft Flooring Legs - Raise Loft Boards by 300mm (12 per box) | Insulation Merchant LOFT LEG XL Loft Flooring Legs - Raise Loft Boards by 300mm (12 per box) | Insulation Merchant
    Sale 10%

    4.0

    LOFT LEG by Loft Leg

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

    £17.23 inc. VAT
    £1.43 per ea
    £14.36 ex. VAT
    £1.20 per ea
    £17.23 inc. VAT
    £1.43 per ea
    £19.15 Save £1.92
    £14.36 ex. VAT
    £1.20 per ea
    £15.96 Save £1.60
  • COROTOP Light - Breathable Membrane - 1m x 50m (50m²) | Insulation Merchant COROTOP Light - Breathable Membrane - 1m x 50m (50m²) | Insulation Merchant

    5.0

    LIGHT by Corotop - Membranes

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

    £36.90 inc. VAT
    £0.73 per m²
    £30.75 ex. VAT
    £0.62 per m²
    £36.90 inc. VAT
    £0.73 per m²
    Save £-36.90
    £30.75 ex. VAT
    £0.62 per m²
    £0.00 Save £-30.75
  • Insulation Support Netting - 1m x 100m | Insulation Merchant

    5.0

    SUPPORT NETTING by Insulation Merchant

    Insulation Support Netting - 1m x 100m

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

    Insulation Support Netting - 2m x 100m

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

    100mm Superglass Multi-Roll 44

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

    150mm Superglass Multi-Roll 44

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

    200mm Superglass Multi-Roll 44

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

    100mm Superglass Multi-Roll 40

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

    150mm Superglass Multi-Roll 40

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    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

    200mm Superglass Multi-Roll 40

    £44.90 inc. VAT
    £8.41 per m²
    £37.42 ex. VAT
    £7.01 per m²
    £44.90 inc. VAT
    £8.41 per m²
    Save £-44.90
    £37.42 ex. VAT
    £7.01 per m²
    £0.00 Save £-37.42
  • 50mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 570mm (5.47m²) 50mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 570mm (5.47m²)
    INDITHERM HEMP - 570 by IndiNature®

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

    £45.13 inc. VAT
    £8.25 per m²
    £37.61 ex. VAT
    £6.88 per m²
    £45.13 inc. VAT
    £8.25 per m²
    Save £-45.13
    £37.61 ex. VAT
    £6.88 per m²
    £0.00 Save £-37.61
  • 100mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 570mm (2.74m²) 100mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 570mm (2.74m²)

    5.0

    INDITHERM HEMP - 570 by IndiNature®

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

    £42.98 inc. VAT
    £15.69 per m²
    £35.82 ex. VAT
    £13.07 per m²
    £42.98 inc. VAT
    £15.69 per m²
    Save £-42.98
    £35.82 ex. VAT
    £13.07 per m²
    £0.00 Save £-35.82
  • 50mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 370mm (3.55m²) 50mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 370mm (3.55m²)
    INDITHERM HEMP - 370 by IndiNature®

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

    £27.90 inc. VAT
    £7.86 per m²
    £23.25 ex. VAT
    £6.55 per m²
    £27.90 inc. VAT
    £7.86 per m²
    Save £-27.90
    £23.25 ex. VAT
    £6.55 per m²
    £0.00 Save £-23.25
  • 100mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 370mm (1.78m²) 100mm IndiNature IndiTherm Hemp Flexibatt Insulation - 1200 x 370mm (1.78m²)

    5.0

    INDITHERM HEMP - 370 by IndiNature®

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

    £27.90 inc. VAT
    £15.67 per m²
    £23.25 ex. VAT
    £13.06 per m²
    £27.90 inc. VAT
    £15.67 per m²
    Save £-27.90
    £23.25 ex. VAT
    £13.06 per m²
    £0.00 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

    5.0

    COSYWOOL by Thermafleece

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

    £96.80 inc. VAT
    £13.41 per m²
    £80.67 ex. VAT
    £11.17 per m²
    £96.80 inc. VAT
    £13.41 per m²
    Save £-96.80
    £80.67 ex. VAT
    £11.17 per m²
    £0.00 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

    5.0

    COSYWOOL by Thermafleece

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

    £99.35 inc. VAT
    £13.41 per m²
    £82.79 ex. VAT
    £11.17 per m²
    £99.35 inc. VAT
    £13.41 per m²
    Save £-99.35
    £82.79 ex. VAT
    £11.17 per m²
    £0.00 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

    4.6

    COSYWOOL by Thermafleece

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

    £95.99 inc. VAT
    £20.12 per m²
    £79.99 ex. VAT
    £16.77 per m²
    £95.99 inc. VAT
    £20.12 per m²
    Save £-95.99
    £79.99 ex. VAT
    £16.77 per m²
    £0.00 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

    5.0

    COSYWOOL by Thermafleece

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

    £98.60 inc. VAT
    £20.12 per m²
    £82.17 ex. VAT
    £16.77 per m²
    £98.60 inc. VAT
    £20.12 per m²
    Save £-98.60
    £82.17 ex. VAT
    £16.77 per m²
    £0.00 Save £-82.17
  • Knauf Loft Roll 44 | Insulation Merchant Knauf Loft Roll 44 | Insulation Merchant
    Spring Savings
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    5.0

    LOFT ROLL by Knauf Insulation

    100mm Knauf Loft Roll 44 (Combi-Cut)

    £44.22 inc. VAT
    £3.18 per m²
    £36.85 ex. VAT
    £2.65 per m²
    £44.22 inc. VAT
    £3.18 per m²
    Save £-44.22
    £36.85 ex. VAT
    £2.65 per m²
    £0.00 Save £-36.85