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

    SIG/C3080

    SIGA Corvum® 30/30 - 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
  • SIGA Fentrim® 20 50/85 (Pre-folded Internal Corner Tape) - 25m SIGA Fentrim® 20 50/85 (Pre-folded Internal Corner Tape) - 25m
    FENTRIM® 20 by SIGA

    SIG/F205085

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

    £84.55 inc. VAT
    £3.38 per LM (linear metre)
    £70.46 ex. VAT
    £2.82 per LM (linear metre)
    £84.55 inc. VAT
    £3.38 per LM (linear metre)
    you save £-84.55
    £70.46 ex. VAT
    £2.82 per LM (linear metre)
    £0.00 you save £-70.46
  • Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 3-6mm - Roll 12mm x 8m Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 3-6mm - Roll 12mm x 8m
    Sale 11%
    CONTEGA FIDEN EXO by Pro Clima

    PC/F1236

    Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 3-6mm - Roll 12mm x 8m

    £5.00 inc. VAT
    £4.17 ex. VAT
    £5.00 inc. VAT
    £5.64 you save £0.64
    £4.17 ex. VAT
    £4.70 you save £0.53
  • Pro Clima Constivap 2.3 Plus - 1.5m x 50m Pro Clima Constivap 2.3 Plus - 1.5m x 50m
    Sale 10%
    CONSTIVAP by Pro Clima

    PC/CV2350

    Pro Clima Constivap 2.3 Plus - 1.5m x 50m

    £152.60 inc. VAT
    £127.17 ex. VAT
    £152.60 inc. VAT
    £170.28 you save £17.68
    £127.17 ex. VAT
    £141.90 you save £14.73
  • Pro Clima Extoseal Encors - 200mm x 20m Pro Clima Extoseal Encors - 200mm x 20m
    Sale 2%
    EXTOSEAL by Pro Clima

    PC/ENCORS200

    Pro Clima Extoseal Encors - 200mm x 20m

    £184.40 inc. VAT
    £153.67 ex. VAT
    £184.40 inc. VAT
    £189.48 you save £5.08
    £153.67 ex. VAT
    £157.90 you save £4.23
  • Pro Clima Roflex 30 - Airtight Pipe Grommet (Pack of 10) Pro Clima Roflex 30 - Airtight Pipe Grommet (Pack of 10)
    Sale 11%
    ROFLEX by Pro Clima

    PC/R30-10

    Pro Clima Roflex 30 - Airtight Pipe Grommet (Pack of 10)

    £37.74 inc. VAT
    £3.77 per ea
    £31.45 ex. VAT
    £3.15 per ea
    £37.74 inc. VAT
    £3.77 per ea
    £42.84 you save £5.10
    £31.45 ex. VAT
    £3.15 per ea
    £35.70 you save £4.25
  • 3m Pro Clima Intello Plus - Vapour Check Membrane (50m) | Insulation Merchant 3m Pro Clima Intello Plus - Vapour Check Membrane (50m) | Insulation Merchant
    Sale 10%
    INTELLO PLUS by Pro Clima

    PC/IP5030

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

    £535.90 inc. VAT
    £3.57 per m²
    £446.58 ex. VAT
    £2.98 per m²
    £535.90 inc. VAT
    £3.57 per m²
    £598.20 you save £62.30
    £446.58 ex. VAT
    £2.98 per m²
    £498.50 you save £51.92
  • SIGA Hard Rubber Roller for tape sealing
    by SIGA

    SIG/HRR

    SIGA Hard Rubber Roller for tape sealing

    £23.25 inc. VAT
    £19.38 ex. VAT
    £23.25 inc. VAT
    you save £-23.25
    £19.38 ex. VAT
    £0.00 you save £-19.38
  • Pro Clima Solitex Plus Connect - Vapour Permeable Membrane + Pre-applied Tape (1.5m x 50m 75m²) Pro Clima Solitex Plus Connect - Vapour Permeable Membrane + Pre-applied Tape (1.5m x 50m 75m²)
    Sale 1%
    SOLITEX PLUS by Pro Clima

    PC/SPC

    Pro Clima Solitex Plus Connect - Vapour Permeable Membrane + Pre-applied Tape (1.5m x 50m 75m²)

    £338.30 inc. VAT
    £4.51 per m²
    £281.92 ex. VAT
    £3.76 per m²
    £338.30 inc. VAT
    £4.51 per m²
    £344.16 you save £5.86
    £281.92 ex. VAT
    £3.76 per m²
    £286.80 you save £4.88
  • Pro Clima Roflex 200 - Airtight Pipe Grommet (Pack of 10) Pro Clima Roflex 200 - Airtight Pipe Grommet (Pack of 10)
    Sale 1%
    ROFLEX by Pro Clima

    PC/R200-10

    Pro Clima Roflex 200 - Airtight Pipe Grommet (Pack of 10)

    £81.90 inc. VAT
    £8.19 per ea
    £68.25 ex. VAT
    £6.83 per ea
    £81.90 inc. VAT
    £8.19 per ea
    £82.92 you save £1.02
    £68.25 ex. VAT
    £6.83 per ea
    £69.10 you save £0.85
  • Pro Clima Extoseal Magov Butyl Tape (60mm x 10m) Pro Clima Extoseal Magov Butyl Tape (60mm x 10m)
    Sale 5%
    EXTOSEAL by Pro Clima

    PC/EXTOSEALMAGOV

    Pro Clima Extoseal Magov Butyl Tape (60mm x 10m)

    £38.50 inc. VAT
    £3.85 per LM (linear metre)
    £32.08 ex. VAT
    £3.21 per LM (linear metre)
    £38.50 inc. VAT
    £3.85 per LM (linear metre)
    £40.56 you save £2.06
    £32.08 ex. VAT
    £3.21 per LM (linear metre)
    £33.80 you save £1.72
  • Pro Clima Tescon Invis - 100mm x 30m
    Sale 2%
    TESCON by Pro Clima

    PC/TINVIS-100

    Pro Clima Tescon Invis - 100mm x 30m

    £52.90 inc. VAT
    £1.76 per LM (linear metre)
    £44.08 ex. VAT
    £1.47 per LM (linear metre)
    £52.90 inc. VAT
    £1.76 per LM (linear metre)
    £54.36 you save £1.46
    £44.08 ex. VAT
    £1.47 per LM (linear metre)
    £45.30 you save £1.22
  • Pro Clima Contega Solido SL-D100 (External Double-sIded Corner Adhesive Tape) - 100mm x 30m Pro Clima Contega Solido SL-D100 (External Double-sIded Corner Adhesive Tape) - 100mm x 30m
    Sale 2%
    CONTEGA SOLIDO SL-D by Pro Clima

    PC/SOLSLD100

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

    £79.40 inc. VAT
    £2.64 per LM (linear metre)
    £66.17 ex. VAT
    £2.21 per LM (linear metre)
    £79.40 inc. VAT
    £2.64 per LM (linear metre)
    £81.60 you save £2.20
    £66.17 ex. VAT
    £2.21 per LM (linear metre)
    £68.00 you save £1.83
  • Pro Clima Roflex 50 - Airtight Pipe Grommet (Pack of 10) Pro Clima Roflex 50 - Airtight Pipe Grommet (Pack of 10)
    Sale 5%
    ROFLEX by Pro Clima

    PC/R50-10

    Pro Clima Roflex 50 - Airtight Pipe Grommet (Pack of 10)

    £40.60 inc. VAT
    £4.06 per ea
    £33.83 ex. VAT
    £3.38 per ea
    £40.60 inc. VAT
    £4.06 per ea
    £42.84 you save £2.24
    £33.83 ex. VAT
    £3.38 per ea
    £35.70 you save £1.87
  • Pro Clima Tescon Profect 50 (Pre-folded Corner Tape) - 30m x 50mm (12/38mm Split) Pro Clima Tescon Profect 50 (Pre-folded Corner Tape) - 30m x 50mm (12/38mm Split)
    Sale 1%
    TESCON by Pro Clima

    PC/TP50

    Pro Clima Tescon Profect 50 (Pre-folded Corner Tape) - 30m x 50mm (12/38mm Split)

    £52.90 inc. VAT
    £1.76 per LM (linear metre)
    £44.08 ex. VAT
    £1.47 per LM (linear metre)
    £52.90 inc. VAT
    £1.76 per LM (linear metre)
    £53.64 you save £0.74
    £44.08 ex. VAT
    £1.47 per LM (linear metre)
    £44.70 you save £0.62
  • SIGA Meltell® 320 Black Hybrid Sealant (310ml cartridge) SIGA Meltell® 320 Black Hybrid Sealant (310ml cartridge)
    MELTELL® by SIGA

    SIG/MT320B-31

    SIGA Meltell® 320 Black Hybrid Sealant (310ml cartridge)

    £8.70 inc. VAT
    £28.06 per litres
    £7.25 ex. VAT
    £23.39 per litres
    £8.70 inc. VAT
    £28.06 per litres
    you save £-8.70
    £7.25 ex. VAT
    £23.39 per litres
    £0.00 you save £-7.25
  • Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 7-12mm - Roll 15mm x 4.3m Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 7-12mm - Roll 15mm x 4.3m
    Sale 10%
    CONTEGA FIDEN EXO by Pro Clima

    PC/F15712

    Pro Clima Contega Fiden Exo (Expansion Joint Tape) - Joint 7-12mm - Roll 15mm x 4.3m

    £7.00 inc. VAT
    £5.83 ex. VAT
    £7.00 inc. VAT
    £7.80 you save £0.80
    £5.83 ex. VAT
    £6.50 you save £0.67
  • SIGA Fentrim® IS 2 (Pre-folded External Corner Tape) SIGA Fentrim® IS 2 (Pre-folded External Corner Tape)
    External Use
    FENTRIM® IS 20 by SIGA

    SIG/FIS275

    SIGA Fentrim® IS 2 (Pre-folded External Corner Tape)

    From £54.90 inc. VAT
    £2.19 per LM (linear metre)
    From £45.75 ex. VAT
    £1.83 per LM (linear metre)
    From £54.90 inc. VAT
    £2.19 per LM (linear metre)
    you save £-54.90
    From £45.75 ex. VAT
    £1.83 per LM (linear metre)
    £0.00 you save £-45.75
  • 50mm SIGA Nail Sealing Tape - 30m | Insulation Merchant 50mm SIGA Nail Sealing Tape - 30m | Insulation Merchant
    NAIL SEALING by SIGA

    SIG/NST50

    50mm SIGA Nail Sealing Tape - 30m

    £50.10 inc. VAT
    £1.67 per LM (linear metre)
    £41.75 ex. VAT
    £1.39 per LM (linear metre)
    £50.10 inc. VAT
    £1.67 per LM (linear metre)
    you save £-50.10
    £41.75 ex. VAT
    £1.39 per LM (linear metre)
    £0.00 you save £-41.75
  • Pro Clima Contega Solido SL200 (Internal Single-sIded Corner Adhesive Tape) - 200mm x 30m Pro Clima Contega Solido SL200 (Internal Single-sIded Corner Adhesive Tape) - 200mm x 30m
    Sale 2%
    CONTEGA SOLIDO SL by Pro Clima

    PC/SOLSL200

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

    £119.50 inc. VAT
    £99.58 ex. VAT
    £119.50 inc. VAT
    £122.76 you save £3.26
    £99.58 ex. VAT
    £102.30 you save £2.72