Retrofit

Our expertise lies in providing advanced Retrofit solutions for both internal and external wall insulation, ensuring your home stays cosy while saving you money on energy bills.

With our wide range of wood fibre insulation, you can rely on year-round comfort. It keeps your house warm during chilly winters and pleasantly cool throughout the summer months.

Choose Insulation Merchant for a more comfortable, energy-efficient home that you'll love living in!

Retrofit Insulation | Insulation Merchant

Autumn Offers

View our Autumn deals and promotions across our range of products.
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  • 115mm EJOT ejotherm STR U 2G Masonry Screw in Anchors (Box of 100) | Insulation Merchant
    Sale 9%
    SCREW + WASHER by EJOT

    115mm EJOT ejotherm STR U 2G Masonry Screw in Anchors (Box of 100)

    £39.06 per item
    £0.39 per screws
    inc. VAT
    £32.55 per item
    £0.33 per screws
    ex. VAT
    £42.97 Save £3.91
    £39.06 per item
    £0.39 per screws
    inc. VAT
    £35.81 Save £3.26
    £32.55 per item
    £0.33 per screws
    ex. VAT
  • Pro Clima Contega Solido SL150 (Internal Single-sIded Corner Adhesive Tape) - 150mm x 30m | Insulation Merchant
    CONTEGA by Pro Clima

    Pro Clima Contega Solido SL150 (Internal Single-sIded Corner Adhesive Tape) - 150mm x 30m

    £97.30 per item
    £3.24 per LM (linear metre)
    inc. VAT
    £81.08 per item
    £2.70 per LM (linear metre)
    ex. VAT
    Save £-97.30
    £97.30 per item
    £3.24 per LM (linear metre)
    inc. VAT
    £0.00 Save £-81.08
    £81.08 per item
    £2.70 per LM (linear metre)
    ex. VAT
  • 60mm STEICO Therm (wet) - 600mm x 1350mm - per board | Insulation Merchant
    THERM (WET) by Steico

    60mm STEICO Therm (wet) - 600mm x 1350mm - per board

    This product is not available.

    Enquire for more information and advice.

  • SIGA Majvest® 700 SOB - Open Facade Membrane (1.5m x 33.4m) | Insulation Merchant
    MAJVEST® by SIGA

    SIGA Majvest® 700 SOB - Open Facade Membrane (1.5m x 33.4m)

    £378.96 per item
    £7.56 per m²
    inc. VAT
    £315.80 per item
    £6.30 per m²
    ex. VAT
    Save £-378.96
    £378.96 per item
    £7.56 per m²
    inc. VAT
    £0.00 Save £-315.80
    £315.80 per item
    £6.30 per m²
    ex. VAT
  • 100mm Thermafleece Supasoft Insulation (2 x 590mm rolls) - 5.90m² | Insulation Merchant

    5.0

    SUPASOFT by Thermafleece

    100mm Thermafleece Supasoft Insulation (2 x 590mm rolls) - 5.90m²

    £65.41 per item
    £11.09 per m²
    inc. VAT
    £54.51 per item
    £9.24 per m²
    ex. VAT
    Save £-65.41
    £65.41 per item
    £11.09 per m²
    inc. VAT
    £0.00 Save £-54.51
    £54.51 per item
    £9.24 per m²
    ex. VAT
  • 3m Pro Clima Intello Plus - Vapour Check Membrane (50m) | Insulation Merchant
    INTELLO by Pro Clima

    3m Pro Clima Intello Plus - Vapour Check Membrane (50m)

    £603.84 per item
    £4.02 per m²
    inc. VAT
    £503.20 per item
    £3.35 per m²
    ex. VAT
    £0.00 Save £-603.84
    £603.84 per item
    £4.02 per m²
    inc. VAT
    £0.00 Save £-503.20
    £503.20 per item
    £3.35 per m²
    ex. VAT
  • SIGA Majvest® 200 - Breather Membrane (Particularly for Closed Facade) | Insulation Merchant
    MAJVEST® by SIGA

    SIGA Majvest® 200 - Breather Membrane (Particularly for Closed Facade)

    £195.45 per item
    £2.60 per m²
    inc. VAT
    £162.88 per item
    £2.17 per m²
    ex. VAT
    Save £-195.45
    £195.45 per item
    £2.60 per m²
    inc. VAT
    £0.00 Save £-162.88
    £162.88 per item
    £2.17 per m²
    ex. VAT
  • SIGA Fentrim® IS 20 (Pre-folded Internal Corner Tape) - All sizes | Insulation Merchant
    Internal Use
    FENTRIM® by SIGA

    SIGA Fentrim® IS 20 (Pre-folded Internal Corner Tape) - All sizes

    From £54.05 per item
    £2.16 per LM (linear metre)
    inc. VAT
    From £45.04 per item
    £1.80 per LM (linear metre)
    ex. VAT
    Save £-54.05
    From £54.05 per item
    £2.16 per LM (linear metre)
    inc. VAT
    £0.00 Save £-45.04
    From £45.04 per item
    £1.80 per LM (linear metre)
    ex. VAT
  • SIGA Majcoat® 350 Diffusion-open Breathable Roof Membrane | Insulation Merchant
    Bat Friendly
    MAJCOAT® by SIGA

    SIGA Majcoat® 350 Diffusion-open Breathable "Bat-Safe" Roof Membrane

    £549.45 per item
    £10.97 per m²
    inc. VAT
    £457.88 per item
    £9.14 per m²
    ex. VAT
    Save £-549.45
    £549.45 per item
    £10.97 per m²
    inc. VAT
    £0.00 Save £-457.88
    £457.88 per item
    £9.14 per m²
    ex. VAT
  • 100mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls) | Insulation Merchant
    COSYWOOL by Thermafleece

    25mm Thermafleece CosyWool Sheep Wool (1 x 570mm roll)

    £38.81 per item
    £5.67 per m²
    inc. VAT
    £32.34 per item
    £4.73 per m²
    ex. VAT
    £34.65 Save £-4.16
    £38.81 per item
    £5.67 per m²
    inc. VAT
    £28.88 Save £-3.47
    £32.34 per item
    £4.73 per m²
    ex. VAT
  • SIGA Corvum® 12/48 Pre-folded Corner Adhesive Tape (60mm x 25m) | Insulation Merchant
    CORVUM® by SIGA

    SIGA Corvum® 12/48 Pre-folded Corner Adhesive Tape (60mm x 25m)

    £49.25 per item
    £1.97 per LM (linear metre)
    inc. VAT
    £41.04 per item
    £1.64 per LM (linear metre)
    ex. VAT
    Save £-49.25
    £49.25 per item
    £1.97 per LM (linear metre)
    inc. VAT
    £0.00 Save £-41.04
    £41.04 per item
    £1.64 per LM (linear metre)
    ex. VAT
  • 100mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls) | Insulation Merchant
    COSYWOOL by Thermafleece

    25mm Thermafleece CosyWool Sheep Wool (1 x 370mm roll)

    £25.20 per item
    £5.68 per m²
    inc. VAT
    £21.00 per item
    £4.73 per m²
    ex. VAT
    £22.50 Save £-2.70
    £25.20 per item
    £5.68 per m²
    inc. VAT
    £18.75 Save £-2.25
    £21.00 per item
    £4.73 per m²
    ex. VAT
  • SIGA Corvum® 30/30 - Pre-folded Corner Adhesive Tape (60mm x 25m) | Insulation Merchant
    CORVUM® by SIGA

    SIGA Corvum® 30/30 - Pre-folded Corner Adhesive Tape (60mm x 25m)

    £49.25 per item
    £1.97 per LM (linear metre)
    inc. VAT
    £41.04 per item
    £1.64 per LM (linear metre)
    ex. VAT
    Save £-49.25
    £49.25 per item
    £1.97 per LM (linear metre)
    inc. VAT
    £0.00 Save £-41.04
    £41.04 per item
    £1.64 per LM (linear metre)
    ex. VAT
  • 60mm STEICOduo Dry - 600mm x 2230mm | Insulation Merchant
    DUO DRY by Steico

    60mm STEICOduo Dry - 600mm x 2230mm

    This product is not available.

    Enquire for more information and advice.

  • Pro Clima Contega Solido SL-D100 (External Double-sIded Corner Adhesive Tape) - 100mm x 30m | Insulation Merchant
    CONTEGA by Pro Clima

    Pro Clima Contega Solido SL-D100 (External Double-sIded Corner Adhesive Tape) - 100mm x 30m

    £86.92 per item
    £2.89 per LM (linear metre)
    inc. VAT
    £72.43 per item
    £2.41 per LM (linear metre)
    ex. VAT
    Save £-86.92
    £86.92 per item
    £2.89 per LM (linear metre)
    inc. VAT
    £0.00 Save £-72.43
    £72.43 per item
    £2.41 per LM (linear metre)
    ex. VAT
  • 80mm STEICO Therm (wet) - 600mm x 1350mm - per board | Insulation Merchant

    5.0

    THERM (WET) by Steico

    80mm STEICO Therm (wet) - 600mm x 1350mm - per board

    This product is not available.

    Enquire for more information and advice.

  • 100mm STEICO Therm (wet)- 600mm x 1350mm - per board | Insulation Merchant
    THERM (WET) by Steico

    100mm STEICO Therm (wet)- 600mm x 1350mm - per board

    This product is not available.

    Enquire for more information and advice.

  • Pro Clima Contega Solido SL200 (Internal Single-sIded Corner Adhesive Tape) - 200mm x 30m | Insulation Merchant
    CONTEGA by Pro Clima

    Pro Clima Contega Solido SL200 (Internal Single-sIded Corner Adhesive Tape) - 200mm x 30m

    £130.67 per item
    inc. VAT
    £108.89 per item
    ex. VAT
    Save £-130.67
    £130.67 per item
    inc. VAT
    £0.00 Save £-108.89
    £108.89 per item
    ex. VAT
  • SIGA Fentrim® 20 50/85 (Pre-folded Internal Corner Tape) - 25m | Insulation Merchant
    FENTRIM® by SIGA

    SIGA Fentrim® 20 50/85 (Pre-folded Internal Corner Tape) - 25m

    £87.40 per item
    £3.49 per LM (linear metre)
    inc. VAT
    £72.83 per item
    £2.91 per LM (linear metre)
    ex. VAT
    Save £-87.40
    £87.40 per item
    £3.49 per LM (linear metre)
    inc. VAT
    £0.00 Save £-72.83
    £72.83 per item
    £2.91 per LM (linear metre)
    ex. VAT
  • Lime Green Silic8 AF1 Aerogel Adhesive & Primer | Insulation Merchant
    SILIC8 by Lime Green

    Lime Green Silic8 AF1 Aerogel Adhesive & Primer

    From £109.90 per item
    inc. VAT
    From £91.58 per item
    ex. VAT
    Save £-109.90
    From £109.90 per item
    inc. VAT
    £0.00 Save £-91.58
    From £91.58 per item
    ex. VAT