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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  • SIGA Fentrim® grommet (Black) - External Airtight Cable & Pipe Sealing SIGA Fentrim® grommet (Black) - External Airtight Cable & Pipe Sealing
    FENTRIM® GROMMET by SIGA

    SIG/FGB-812

    SIGA Fentrim® grommet (Black) - External Airtight Cable & Pipe Sealing

    From £4.20 inc. VAT
    From £3.50 ex. VAT
    From £4.20 inc. VAT
    you save £-4.20
    From £3.50 ex. VAT
    £0.00 you save £-3.50
  • Pro Clima Contega Solido SL150 (Internal Single-sIded Corner Adhesive Tape) - 150mm x 30m Pro Clima Contega Solido SL150 (Internal Single-sIded Corner Adhesive Tape) - 150mm x 30m
    Sale 2%
    CONTEGA SOLIDO SL by Pro Clima

    PC/SOLSL150

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

    £88.90 inc. VAT
    £2.96 per LM (linear metre)
    £74.08 ex. VAT
    £2.47 per LM (linear metre)
    £88.90 inc. VAT
    £2.96 per LM (linear metre)
    £91.32 you save £2.42
    £74.08 ex. VAT
    £2.47 per LM (linear metre)
    £76.10 you save £2.02
  • Pro Clima Orcon F - Flexible airtight solid acrylic sealant (600ml) Pro Clima Orcon F - Flexible airtight solid acrylic sealant (600ml)
    Sale 4%
    ORCON F by Pro Clima

    PC/ORC600

    Pro Clima Orcon F - Flexible airtight solid acrylic sealant (600ml)

    £13.25 inc. VAT
    £0.02 per ml
    £11.04 ex. VAT
    £0.02 per ml
    £13.25 inc. VAT
    £0.02 per ml
    £13.92 you save £0.67
    £11.04 ex. VAT
    £0.02 per ml
    £11.60 you save £0.56
  • Pro Clima Kaflex Duo - Airtight Cable Grommet (Pack of 15) Pro Clima Kaflex Duo - Airtight Cable Grommet (Pack of 15)
    Sale 5%
    KAFLEX by Pro Clima

    PC/KDUO-15

    Pro Clima Kaflex Duo - Airtight Cable Grommet (Pack of 15)

    £43.50 inc. VAT
    £2.90 per ea
    £36.25 ex. VAT
    £2.42 per ea
    £43.50 inc. VAT
    £2.90 per ea
    £45.84 you save £2.34
    £36.25 ex. VAT
    £2.42 per ea
    £38.20 you save £1.95
  • 60mm SIGA Wigluv® Black 60 External Adhesive Tape - (40m x 60mm) | Insulation Merchant 60mm SIGA Wigluv® Black 60 External Adhesive Tape - (40m x 60mm) | Insulation Merchant
    WIGLUV® BLACK 60 by SIGA

    SIG/WLB60

    60mm SIGA Wigluv® Black 60 External Adhesive Tape - (40m x 60mm)

    From £64.75 inc. VAT
    £1.61 per LM (linear metre)
    From £53.96 ex. VAT
    £1.35 per LM (linear metre)
    From £64.75 inc. VAT
    £1.61 per LM (linear metre)
    you save £-64.75
    From £53.96 ex. VAT
    £1.35 per LM (linear metre)
    £0.00 you save £-53.96
  • SIGA Wigluv® 100 External Adhesive Tape - (100mm x 25m) SIGA Wigluv® 100 External Adhesive Tape - (100mm x 25m)
    WIGLUV® 100 by SIGA

    SIG/WL100

    SIGA Wigluv® 100 External Adhesive Tape - (100mm x 25m)

    £56.15 inc. VAT
    £2.24 per LM (linear metre)
    £46.79 ex. VAT
    £1.87 per LM (linear metre)
    £56.15 inc. VAT
    £2.24 per LM (linear metre)
    you save £-56.15
    £46.79 ex. VAT
    £1.87 per LM (linear metre)
    £0.00 you save £-46.79
  • SIGA Fentrim® IS 20 (Pre-folded Internal Corner Tape) - All sizes SIGA Fentrim® IS 20 (Pre-folded Internal Corner Tape) - All sizes
    Internal Use
    FENTRIM® IS 20 by SIGA

    SIG/FIS2075

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

    From £52.30 inc. VAT
    £2.09 per LM (linear metre)
    From £43.58 ex. VAT
    £1.74 per LM (linear metre)
    From £52.30 inc. VAT
    £2.09 per LM (linear metre)
    you save £-52.30
    From £43.58 ex. VAT
    £1.74 per LM (linear metre)
    £0.00 you save £-43.58
  • SIGA Majvest® 700 SOB - Open Facade Membrane (1.5m x 33.4m) SIGA Majvest® 700 SOB - Open Facade Membrane (1.5m x 33.4m)
    MAJVEST® 700 SOB by SIGA

    SIG/MV700S

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

    £327.15 inc. VAT
    £6.53 per m²
    £272.63 ex. VAT
    £5.44 per m²
    £327.15 inc. VAT
    £6.53 per m²
    you save £-327.15
    £272.63 ex. VAT
    £5.44 per m²
    £0.00 you save £-272.63
  • SIGA Rissan® 100 VCL & Jointing Airtightness Tape - 100mm x 25m SIGA Rissan® 100 VCL & Jointing Airtightness Tape - 100mm x 25m
    RISSAN® 100 by SIGA

    SIG/R100

    SIGA Rissan® 100 VCL & Jointing Airtightness Tape - 100mm x 25m

    £53.95 inc. VAT
    £2.15 per LM (linear metre)
    £44.96 ex. VAT
    £1.80 per LM (linear metre)
    £53.95 inc. VAT
    £2.15 per LM (linear metre)
    you save £-53.95
    £44.96 ex. VAT
    £1.80 per LM (linear metre)
    £0.00 you save £-44.96
  • Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 10-18mm - Roll 20mm x 2.6m Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 10-18mm - Roll 20mm x 2.6m
    Sale 0%
    CONTEGA FIDEN EXO by Pro Clima

    PC/F201018

    Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 10-18mm - Roll 20mm x 2.6m

    £8.70 inc. VAT
    £7.25 ex. VAT
    £8.70 inc. VAT
    £8.76 you save £0.06
    £7.25 ex. VAT
    £7.30 you save £0.05
  • SIGA Fentrim® grommet (White) - Internal Airtight Cable & Pipe Sealing SIGA Fentrim® grommet (White) - Internal Airtight Cable & Pipe Sealing
    FENTRIM® GROMMET by SIGA

    SIG/FGW-812

    SIGA Fentrim® grommet (White) - Internal Airtight Cable & Pipe Sealing

    From £4.20 inc. VAT
    From £3.50 ex. VAT
    From £4.20 inc. VAT
    you save £-4.20
    From £3.50 ex. VAT
    £0.00 you save £-3.50
  • SIGA Majvest® 200 - Breather Membrane (Particularly for Closed Facade) SIGA Majvest® 200 - Breather Membrane (Particularly for Closed Facade)
    MAJVEST® 200 by SIGA

    SIG/MV200-15

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

    £195.45 inc. VAT
    £2.60 per m²
    £162.88 ex. VAT
    £2.17 per m²
    £195.45 inc. VAT
    £2.60 per m²
    you save £-195.45
    £162.88 ex. VAT
    £2.17 per m²
    £0.00 you save £-162.88
  • Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 5-10mm (Roll 20mm x 5.6m) Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 5-10mm (Roll 20mm x 5.6m)
    Sale 0%
    CONTEGA FIDEN EXO by Pro Clima

    PC/F20510

    Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 5-10mm (Roll 20mm x 5.6m)

    £8.94 inc. VAT
    £7.45 ex. VAT
    £8.94 inc. VAT
    £9.00 you save £0.06
    £7.45 ex. VAT
    £7.50 you save £0.05
  • Pro Clima Roflex 100 - Airtight Pipe Grommet (Pack of 10) Pro Clima Roflex 100 - Airtight Pipe Grommet (Pack of 10)
    Sale 2%
    ROFLEX by Pro Clima

    PC/R100-10

    Pro Clima Roflex 100 - Airtight Pipe Grommet (Pack of 10)

    £48.90 inc. VAT
    £4.89 per ea
    £40.75 ex. VAT
    £4.08 per ea
    £48.90 inc. VAT
    £4.89 per ea
    £50.40 you save £1.50
    £40.75 ex. VAT
    £4.08 per ea
    £42.00 you save £1.25
  • SIGA Corvum® 12/48 Pre-folded Corner Adhesive Tape (60mm x 25m) SIGA Corvum® 12/48 Pre-folded Corner Adhesive Tape (60mm x 25m)
    CORVUM® by SIGA

    SIG/C1248

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

    £47.65 inc. VAT
    £1.90 per LM (linear metre)
    £39.71 ex. VAT
    £1.59 per LM (linear metre)
    £47.65 inc. VAT
    £1.90 per LM (linear metre)
    you save £-47.65
    £39.71 ex. VAT
    £1.59 per LM (linear metre)
    £0.00 you save £-39.71
  • Pro Clima DB+ - 1.35m x 50m Pro Clima DB+ - 1.35m x 50m
    Sale 11%
    DB+ by Pro Clima

    PC/DBPLUS

    Pro Clima DB+ - 1.35m x 50m

    £203.90 inc. VAT
    £3.02 per m²
    £169.92 ex. VAT
    £2.52 per m²
    £203.90 inc. VAT
    £3.02 per m²
    £231.36 you save £27.46
    £169.92 ex. VAT
    £2.52 per m²
    £192.80 you save £22.88
  • Pro Clima Dasatop - 1.5m x 50m (75m²) Pro Clima Dasatop - 1.5m x 50m (75m²)
    Sale 10%
    DASATOP by Pro Clima

    PC/DT

    Pro Clima Dasatop - 1.5m x 50m (75m²)

    £197.90 inc. VAT
    £2.63 per m²
    £164.92 ex. VAT
    £2.20 per m²
    £197.90 inc. VAT
    £2.63 per m²
    £219.96 you save £22.06
    £164.92 ex. VAT
    £2.20 per m²
    £183.30 you save £18.38
  • Pro Clima Extoseal Encors - 150mm x 20m Pro Clima Extoseal Encors - 150mm x 20m
    Sale 2%
    EXTOSEAL by Pro Clima

    PC/ENCORS150

    Pro Clima Extoseal Encors - 150mm x 20m

    £136.50 inc. VAT
    £113.75 ex. VAT
    £136.50 inc. VAT
    £140.28 you save £3.78
    £113.75 ex. VAT
    £116.90 you save £3.15
  • Pro Clima Kaflex Multi - Airtight Cable Grommet (Pack of 10) Pro Clima Kaflex Multi - Airtight Cable Grommet (Pack of 10)
    Sale 1%
    KAFLEX by Pro Clima

    PC/KMULTI-10

    Pro Clima Kaflex Multi - Airtight Cable Grommet (Pack of 10)

    £104.90 inc. VAT
    £10.49 per ea
    £87.42 ex. VAT
    £8.74 per ea
    £104.90 inc. VAT
    £10.49 per ea
    £106.20 you save £1.30
    £87.42 ex. VAT
    £8.74 per ea
    £88.50 you save £1.08
  • Pro Clima Roflex 150 - Airtight Pipe Grommet (Pack of 10) Pro Clima Roflex 150 - Airtight Pipe Grommet (Pack of 10)
    Sale 11%
    ROFLEX by Pro Clima

    PC/R150-10

    Pro Clima Roflex 150 - Airtight Pipe Grommet (Pack of 10)

    £60.40 inc. VAT
    £6.04 per ea
    £50.33 ex. VAT
    £5.03 per ea
    £60.40 inc. VAT
    £6.04 per ea
    £68.40 you save £8.00
    £50.33 ex. VAT
    £5.03 per ea
    £57.00 you save £6.67