Airtight & Windtight Systems

Airtightness and Widtightness are essential aspects to consider when building or renovating. Air leakage into and out of a property can be detrimental to the thermal performance of insulation. Creating an airtight seal in the property helps minimize heat loss or gain and eliminates drafts ensuring a consistent indoor temperature. It also helps eliminate the entry of pollutants, allergens, and moisture, resulting in a healthier indoor environment. 

Shop our range of airtight membranes, tapes, grommets, and sealants.

Airtight and windtight systems | Insulation Merchant

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Airtight & Windtight Membranes

Airtight & Windtight Membranes

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Airtight and windtight systems | Insulation Merchant

Airtight & Windtight Tapes and Sealants

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Liquid Airtight Membranes

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Airtight Grommets

Airtight Grommets

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Expanding Tapes

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Pro Clima

Pro Clima

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SIGA

SIGA

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  • Pro Clima Aerosanna Fleece Pro Clima Aerosanna Fleece
    Sale 5%
    AEROSANA FLEECE by Pro Clima

    PC/AVFL

    Pro Clima Aerosanna Fleece

    £17.67
    £0.70 per LM (linear metre)
    £14.73 ex. VAT
    £0.59 per LM (linear metre)
    £17.67
    £0.70 per LM (linear metre)
    £18.60 you save £0.93
    £14.73 ex. VAT
    £0.59 per LM (linear metre)
    £15.50 you save £0.78
  • Pro Clima Contega Solido EXO-D80 (External Double-sIded Corner Adhesive Tape) - 30m x 80mm Pro Clima Contega Solido EXO-D80 (External Double-sIded Corner Adhesive Tape) - 30m x 80mm
    Sale 5%
    CONTEGA SOLIDO EXO-D by Pro Clima

    PC/SOLEXOD80

    Pro Clima Contega Solido EXO-D80 (External Double-sIded Corner Adhesive Tape) - 30m x 80mm

    £64.75
    £2.15 per LM (linear metre)
    £53.96 ex. VAT
    £1.80 per LM (linear metre)
    £64.75
    £2.15 per LM (linear metre)
    £68.16 you save £3.41
    £53.96 ex. VAT
    £1.80 per LM (linear metre)
    £56.80 you save £2.84
  • SIGA Wigluv® black 20/40 Split External Adhesive Tape (60mm x 25m) SIGA Wigluv® black 20/40 Split External Adhesive Tape (60mm x 25m)
    WIGLUV® BLACK 20/40 by SIGA

    SIG/WLB2040

    SIGA Wigluv® black 20/40 Split External Adhesive Tape (60mm x 25m)

    £58.50
    £2.34 per LM (linear metre)
    £48.75 ex. VAT
    £1.95 per LM (linear metre)
    £58.50
    £2.34 per LM (linear metre)
    you save £-58.50
    £48.75 ex. VAT
    £1.95 per LM (linear metre)
    £0.00 you save £-48.75
  • SIGA Trestard® 420 black FR (Fire Rated Tape) - All Sizes SIGA Trestard® 420 black FR (Fire Rated Tape) - All Sizes
    Fire Rated
    TRESTARD® 420 by SIGA

    SIG/T420-150

    SIGA Trestard® 420 black FR (Fire Rated Tape) - All Sizes

    From £131.25
    £5.25 per LM (linear metre)
    From £109.38 ex. VAT
    £4.38 per LM (linear metre)
    From £131.25
    £5.25 per LM (linear metre)
    you save £-131.25
    From £109.38 ex. VAT
    £4.38 per LM (linear metre)
    £0.00 you save £-109.38
  • SIGA Fentrim® 330 Grey Adhesive Tape - 150mm SIGA Fentrim® 330 Grey Adhesive Tape - 150mm
    FENTRIM® 330 GREY by SIGA

    SIG/F330G-150

    SIGA Fentrim® 330 Grey Adhesive Tape - 150mm

    £163.60
    £6.54 per LM (linear metre)
    £136.33 ex. VAT
    £5.45 per LM (linear metre)
    £163.60
    £6.54 per LM (linear metre)
    you save £-163.60
    £136.33 ex. VAT
    £5.45 per LM (linear metre)
    £0.00 you save £-136.33
  • SIGA Dockskin® 100 Fibrous Surface Primer - 1kg bottle SIGA Dockskin® 100 Fibrous Surface Primer - 1kg bottle
    DOCKSKIN® by SIGA

    SIG/DS100-1

    SIGA Dockskin® 100 Fibrous Surface Primer - 1kg bottle

    £29.25
    £24.38 ex. VAT
    £29.25
    you save £-29.25
    £24.38 ex. VAT
    £0.00 you save £-24.38
  • SIGA Fentrim® 2 50/85 (Pre-folded External Corner Tape) - 25m SIGA Fentrim® 2 50/85 (Pre-folded External Corner Tape) - 25m
    FENTRIM® 2 by SIGA

    SIG/F2-5085

    SIGA Fentrim® 2 50/85 (Pre-folded External Corner Tape) - 25m

    £88.80
    £3.55 per LM (linear metre)
    £74.00 ex. VAT
    £2.96 per LM (linear metre)
    £88.80
    £3.55 per LM (linear metre)
    you save £-88.80
    £74.00 ex. VAT
    £2.96 per LM (linear metre)
    £0.00 you save £-74.00
  • SIGA Majcoat® 350 Diffusion-open Breathable Roof Membrane SIGA Majcoat® 350 Diffusion-open Breathable Roof Membrane
    New
    MAJCOAT® 350 by SIGA

    SIG/MC350-15

    SIGA Majcoat® 350 Diffusion-open Breathable Roof Membrane

    £ Looking for a price?

    Add to a quote for our best rate.

  • SIGA Tape Dispenser SIGA Tape Dispenser
    TAPE DISPENSER by SIGA

    SIG/TD

    SIGA Tape Dispenser

    £26.10
    £21.75 ex. VAT
    £26.10
    you save £-26.10
    £21.75 ex. VAT
    £0.00 you save £-21.75
  • Pro Clima Contega Solido EXO-D100 (External Double-sIded Corner Adhesive Tape) - 30m x 100mm Pro Clima Contega Solido EXO-D100 (External Double-sIded Corner Adhesive Tape) - 30m x 100mm
    Sale 5%
    CONTEGA SOLIDO EXO-D by Pro Clima

    PC/SOLEXOD100

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

    £77.50
    £2.58 per LM (linear metre)
    £64.58 ex. VAT
    £2.15 per LM (linear metre)
    £77.50
    £2.58 per LM (linear metre)
    £81.60 you save £4.10
    £64.58 ex. VAT
    £2.15 per LM (linear metre)
    £68.00 you save £3.42
  • SIGA Primur Roll (Flexible Membrane Seal)
    PRIMUR by SIGA

    SIG/P12

    SIGA Primur Roll (Flexible Membrane Seal)

    £20.35
    £2.54 per LM (linear metre)
    £16.96 ex. VAT
    £2.12 per LM (linear metre)
    £20.35
    £2.54 per LM (linear metre)
    you save £-20.35
    £16.96 ex. VAT
    £2.12 per LM (linear metre)
    £0.00 you save £-16.96
  • SIGA Fentrim® 20 (Pre-folded Internal Corner Tape) - All sizes
    Internal Use
    FENTRIM® 20 by SIGA

    SIG/F20-100

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

    From £63.45
    £2.53 per LM (linear metre)
    From £52.88 ex. VAT
    £2.12 per LM (linear metre)
    From £63.45
    £2.53 per LM (linear metre)
    you save £-63.45
    From £52.88 ex. VAT
    £2.12 per LM (linear metre)
    £0.00 you save £-52.88
  • SIGA Majvest® 500 SA - Self-Adhesive Facade Membrane (1.52m x 30.5m) SIGA Majvest® 500 SA - Self-Adhesive Facade Membrane (1.52m x 30.5m)
    MAJVEST® 500 SA by SIGA

    SIG/MV500S-60

    SIGA Majvest® 500 SA - Self-Adhesive Facade Membrane (1.52m x 30.5m)

    £575.95
    £12.43 per m²
    £479.96 ex. VAT
    £10.36 per m²
    £575.95
    £12.43 per m²
    you save £-575.95
    £479.96 ex. VAT
    £10.36 per m²
    £0.00 you save £-479.96
  • SIGA Wetguard® 200 SA - 780mm x 50m SIGA Wetguard® 200 SA - 780mm x 50m
    WETGUARD® by SIGA

    SIG/WG200S-78

    SIGA Wetguard® 200 SA - 780mm x 50m

    £382.25
    £9.80 per m²
    £318.54 ex. VAT
    £8.17 per m²
    £382.25
    £9.80 per m²
    you save £-382.25
    £318.54 ex. VAT
    £8.17 per m²
    £0.00 you save £-318.54
  • SIGA Sicrall® 170 VCL and Jointing Airtight Tape SIGA Sicrall® 170 VCL and Jointing Airtight Tape
    SICRALL® by SIGA

    SIG/S170

    SIGA Sicrall® 170 VCL and Jointing Airtight Tape

    £113.10
    £2.82 per LM (linear metre)
    £94.25 ex. VAT
    £2.36 per LM (linear metre)
    £113.10
    £2.82 per LM (linear metre)
    you save £-113.10
    £94.25 ex. VAT
    £2.36 per LM (linear metre)
    £0.00 you save £-94.25
  • SIGA Dockskin® 100 Fibrous Surface Primer - 4kg tub SIGA Dockskin® 100 Fibrous Surface Primer - 4kg tub
    DOCKSKIN® by SIGA

    SIG/DS100-4

    SIGA Dockskin® 100 Fibrous Surface Primer - 4kg tub

    £99.70
    £83.08 ex. VAT
    £99.70
    you save £-99.70
    £83.08 ex. VAT
    £0.00 you save £-83.08
  • Siga Knife & Ruler Set Siga Knife & Ruler Set
    by SIGA

    SIG/KNIRUL

    Siga Knife & Ruler Set

    £25.00
    £20.83 ex. VAT
    £25.00
    you save £-25.00
    £20.83 ex. VAT
    £0.00 you save £-20.83
  • SIGA Majcoat® 150 SOB Breather Membrane - 1.5m x 50m SIGA Majcoat® 150 SOB Breather Membrane - 1.5m x 50m
    MAJCOAT® 150 by SIGA

    SIG/MC150S

    SIGA Majcoat® 150 SOB Breather Membrane - 1.5m x 50m

    £240.00
    £3.20 per m²
    £200.00 ex. VAT
    £2.67 per m²
    £240.00
    £3.20 per m²
    you save £-240.00
    £200.00 ex. VAT
    £2.67 per m²
    £0.00 you save £-200.00
  • SIGA Primur® Tubular Bag Bonding Adhesive (600ml) SIGA Primur® Tubular Bag Bonding Adhesive (600ml)
    PRIMUR® by SIGA

    SIG/PTB

    SIGA Primur® Tubular Bag Bonding Adhesive (600ml)

    £23.00
    £38.33 per litres
    £19.17 ex. VAT
    £31.94 per litres
    £23.00
    £38.33 per litres
    you save £-23.00
    £19.17 ex. VAT
    £31.94 per litres
    £0.00 you save £-19.17
  • SIGA Majpell® 25 Vapour Control Layer - 1.5m x 50m (75m²) SIGA Majpell® 25 Vapour Control Layer - 1.5m x 50m (75m²)
    MAJPELL® 25 by SIGA

    SIG/MP25-15

    SIGA Majpell® 25 Vapour Control Layer - 1.5m x 50m (75m²)

    £224.70
    £2.99 per m²
    £187.25 ex. VAT
    £2.50 per m²
    £224.70
    £2.99 per m²
    you save £-224.70
    £187.25 ex. VAT
    £2.50 per m²
    £0.00 you save £-187.25