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Best Construction Vapour Barriers of 2026

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Corey Phillips

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Construction vapour barriers are an essential component in preventing moisture from penetrating walls, floors, and ceilings in buildings. These barriers are designed to restrict water vapour transmission, which can cause damage to the building structure and lead to the growth of mould and mildew. They are typically made from polyethylene or polypropylene materials and come in a range of sizes and thicknesses to suit different building applications. By installing vapour barriers, builders can help to maintain a healthy indoor environment, improve energy efficiency, and prolong the lifespan of the building.

At a Glance: Our Top Picks

Top 10 Construction Vapour Barriers

#TOP 1

Polythene Vapour Control Layer 500 Gauge - 125MU Green Tint 2.7m x 50m Roll

Polythene Vapour Control Layer 500 Gauge - 125MU Green Tint 2.7m x 50m Roll Cover

Polythene Vapour Control Layer 500 Gauge - 125MU Green Tint 2.7m x 50m Roll

Features

  • For Use Within Wall, Roof And Floor Construction
  • CE Marked To EN13984
  • Vapour Barrier Also Restricts The Movement Of Warm Moist Air And Improves Building Insulation.
9.9
FTB Score
#TOP 2

Polythene Vapour Moisture Control Layer Barrier Sheet Green Tint 125mu 500ga Green 4m x 50m

Polythene Vapour Moisture Control Layer Barrier Sheet Green Tint 125mu 500ga Green 4m x 50m Cover

Polythene Vapour Moisture Control Layer Barrier Sheet Green Tint 125mu 500ga Green 4m x 50m

Features

  • 125mu 500ga Green Polythene Vapour Barrier 4m X 50m
  • This 500ga Green Polythene Vapour Barrier 4m X 50m Prevents Moisture Damage And Mould By Providing A Barrier Against Damp Air. This Prevents Vapour From Permeating Through Buildings And Forming Condensation. Vapour Barriers Are Versatile, Typically Used Under Floors, Within Walls And In Roof Applications.
  • Made Of Impermeable Polythene, Designed To Block Water Vapour And Airflow Movement Suitable For Under Floors, Within Walls And In Roof Applications Minimises The Risk Of Mould Growth In Your Home Lightweight And Easy To Handle Green In Colour Technical Information Thickness: 500ga Length: 50m Width: 4m
9.8
FTB Score
#TOP 3

Aston Bs Aluminium Foil Vapour Barrier Membrane 1.5m x 50m (75sqm) - Reflective Insulation Roll for Roof, Wall & Floor - Moisture & Heat Resistant - CE Approved Thermal Insulation

  • ASTON BUILDING SUPPLIES LTD
  • Silver
  • 1.5MTR X 50MTR ROLL
Aston Bs Aluminium Foil Vapour Barrier Membrane 1.5m x 50m (75sqm) - Reflective Insulation Roll for Roof, Wall & Floor - Moisture & Heat Resistant - CE Approved Thermal Insulation Cover

Aston Bs Aluminium Foil Vapour Barrier Membrane 1.5m x 50m (75sqm) – Reflective Insulation Roll for Roof, Wall & Floor – Moisture & Heat Resistant – CE Approved Thermal Insulation

Features

  • Where To Use Versatile Enough For A Range Of Projects, The Aston BS Vapour Barrier Membrane Is Ideal For: Roofs (pitched Or Flat) Ceilings And Loft Spaces Internal And External Walls Flooring Systems And Underlays Conservatories And Extensions Install On The Warm Side Of Insulation To Prevent Interstitial Condensation And Achieve Optimal Thermal Performance.
  • Key Benefits Reduces Heat Loss: Reflects Up To 97% Of Radiant Heat Back Into Your Building. Improves Energy Efficiency: Creates A Thermal Barrier That Reduces Heating And Cooling Costs. Moisture & Condensation Control: Prevents Dampness, Mould, And Structural Damage. Lightweight & Easy To Install: Simple To Cut, Handle, And Fit In Any Insulation Setup. Durable Construction: Reinforced With A Scrim Mesh For Added Strength And Tear Resistance.
  • Why Choose Aston BS With A Focus On Innovation, Reliability, And Performance, Aston BS Offers Premium-Grade Building Materials Trusted By Professionals And Homeowners Alike. Each Product Is Engineered To The Highest Standards, Ensuring Long-Lasting Protection, Energy Savings, And Comfort.
9.6
FTB Score
#TOP 4

Green Vapour Check Barrier - 125 Micron (mu) | 2.5m Width | Various Lengths Moisture Control Layer (5 Metres)

Green Vapour Check Barrier - 125 Micron (mu) | 2.5m Width | Various Lengths Moisture Control Layer (5 Metres) Cover

Green Vapour Check Barrier - 125 Micron (mu) | 2.5m Width | Various Lengths Moisture Control Layer (5 Metres)

Features

  • 125 Micron Thickness: Offers Robust Vapor Resistance (500-Gauge) To Control Warm, Moist Air Within Structures.
  • 2.5m Wide Versatile Vapour Barrier: Suitable For Walls, Floors, And Roofs, Preventing Condensation And Protecting Insulation From Moisture.
  • Multiple Cut Options: Available In Various Lengths (select Preferred Cut In Material Options).
9.6
FTB Score
#TOP 5

Green Vapour Check Barrier - 125 Micron (mu) | 2.5m Width | Various Lengths Moisture Control Layer (10 Metres)

Green Vapour Check Barrier - 125 Micron (mu) | 2.5m Width | Various Lengths Moisture Control Layer (10 Metres) Cover

Green Vapour Check Barrier - 125 Micron (mu) | 2.5m Width | Various Lengths Moisture Control Layer (10 Metres)

Features

  • 125 Micron Thickness: Offers Robust Vapor Resistance (500-Gauge) To Control Warm, Moist Air Within Structures.
  • 2.5m Wide Versatile Vapour Barrier: Suitable For Walls, Floors, And Roofs, Preventing Condensation And Protecting Insulation From Moisture.
  • Multiple Cut Options: Available In Various Lengths (select Preferred Cut In Material Options).
9.6
FTB Score
#TOP 6

Vapour Barrier Membrane VCL+ 1 x 45m Aluminium Tape Set - Thermal, Insulating Reflective Aluminium Foil Barrier - Use for Flooring, Walls and Roof Insulation 1m x 50m - 50 sq/m

Vapour Barrier Membrane VCL+ 1 x 45m Aluminium Tape Set - Thermal, Insulating Reflective Aluminium Foil Barrier - Use for Flooring, Walls and Roof Insulation 1m x 50m - 50 sq/m Cover

Vapour Barrier Membrane VCL+ 1 x 45m Aluminium Tape Set - Thermal, Insulating Reflective Aluminium Foil Barrier - Use for Flooring, Walls and Roof Insulation 1m x 50m - 50 sq/m

Features

  • MULTI-PURPOSE - Versatility At Its Best! Our Vapour Barrier Membrane Can Be Used In Various Areas Of Your Home To Ensure Optimum Ambient Conditions. Whether It's Under Plasterboards Or As Part Of A Roofing System, This Product Will Not Disappoint. Installed On Warm Side Of Insulation, It Protects And Insulates From Interstitial Condensation.
  • LOWER YOUR HEATING BILLS - Vapour Barrier Membrane - Say Goodbye To Unwanted Moisture And Hello To A More Comfortable Home With Our High-Quality Vapour Barrier. It's Perfect For Use On Floors, Walls, And Roofs, Providing An Effective Insulating Layer That Reduces Heat Loss And Lowers Your Heating Costs. Increases Energy Efficiency By Reflecting Heat Back Into The Build.
  • PROUDLY A BRITISH BRAND - As A Proud British Company, We Take Great Pride In Delivering Top-Quality Products And Services To Our Customers. Our Vapour Barrier Is No Exception, Made From Premium Materials And Reinforcement Scrim Provides Sufficient Strength For Wall And Ceiling Applications
9.6
FTB Score
#TOP 7

Green Vapour Check Barrier - 125 Micron (mu) | 4m Width | Various Lengths Moisture Control Layer (2 Metres)

Green Vapour Check Barrier - 125 Micron (mu) | 4m Width | Various Lengths Moisture Control Layer (2 Metres) Cover

Green Vapour Check Barrier - 125 Micron (mu) | 4m Width | Various Lengths Moisture Control Layer (2 Metres)

Features

  • 125 Micron Thickness: Offers Robust Vapor Resistance (500-Gauge) To Control Warm, Moist Air Within Structures.
  • Versatile Vapour Barrier: Suitable For Walls, Floors, And Roofs, Preventing Condensation And Protecting Insulation From Moisture.
  • Multiple Cut Options: Available In Various Lengths (select Preferred Cut In Material Options).
9.4
FTB Score
#TOP 8

Vapour Barrier Membrane VCL- Thermal, Insulating Reflective Aluminium Foil Barrier - Use for Flooring, Walls and Roof Insulation. (1.5m x 50m (75 sq/m))

Vapour Barrier Membrane VCL- Thermal, Insulating Reflective Aluminium Foil Barrier - Use for Flooring, Walls and Roof Insulation. (1.5m x 50m (75 sq/m)) Cover

Vapour Barrier Membrane VCL- Thermal, Insulating Reflective Aluminium Foil Barrier - Use for Flooring, Walls and Roof Insulation. (1.5m x 50m (75 sq/m))

Features

  • MULTI-PURPOSE - Versatility At Its Best! Our Vapour Barrier Membrane Can Be Used In Various Areas Of Your Home To Ensure Optimum Ambient Conditions. Whether It's Under Plasterboards Or As Part Of A Roofing System, This Product Will Not Disappoint. Installed On Warm Side Of Insulation, It Protects And Insulates From Interstitial Condensation.
  • LOWER YOUR HEATING BILLS - Vapour Barrier Membrane - Say Goodbye To Unwanted Moisture And Hello To A More Comfortable Home With Our High-Quality Vapour Barrier. It's Perfect For Use On Floors, Walls, And Roofs, Providing An Effective Insulating Layer That Reduces Heat Loss And Lowers Your Heating Costs. Increases Energy Efficiency By Reflecting Heat Back Into The Build.
  • PROUDLY A BRITISH BRAND - As A Proud British Company, We Take Great Pride In Delivering Top-Quality Products And Services To Our Customers. Our Vapour Barrier Is No Exception, Made From Premium Materials And Reinforcement Scrim Provides Sufficient Strength For Wall And Ceiling Applications
9.3
FTB Score
#TOP 9

Tyvek Dupont Airguard Reflective Vapour Barrier

Tyvek Dupont Airguard Reflective Vapour Barrier Cover

Tyvek Dupont Airguard Reflective Vapour Barrier Membrane 50m x 1.5m Roll

The Tyvek Airguard Vapour Barrier is designed to provide excellent insulation for construction projects. With a generous size of 50m x 1.5m, it effectively prevents moisture from entering your structures, ensuring a dry and comfortable environment. This vapour barrier also reflects heat, helping to maintain energy efficiency in your home. By using this product, you can enjoy a more energy-efficient space, reducing heating costs and improving overall comfort.

9.2
FTB Score

What We Like

  • Excellent moisture protection
  • Energy efficient
  • Large coverage area
  • Heat reflective
#TOP 10

Green Vapour Check Barrier - 125 Micron (mu) | 4m Width | Various Lengths Moisture Control Layer (5 Metres)

Green Vapour Check Barrier - 125 Micron (mu) | 4m Width | Various Lengths Moisture Control Layer (5 Metres) Cover

Green Vapour Check Barrier - 125 Micron (mu) | 4m Width | Various Lengths Moisture Control Layer (5 Metres)

Features

  • 125 Micron Thickness: Offers Robust Vapor Resistance (500-Gauge) To Control Warm, Moist Air Within Structures.
  • Versatile Vapour Barrier: Suitable For Walls, Floors, And Roofs, Preventing Condensation And Protecting Insulation From Moisture.
  • Multiple Cut Options: Available In Various Lengths (select Preferred Cut In Material Options).
9.1
FTB Score

Frequently Asked Questions (FAQs)

1. What does a vapour barrier do?

A vapour barrier is an important component in building construction. Its purpose is to help prevent water vapour from reaching building walls, ceilings, attics, crawlspaces or roofs, where it can condense and cause building materials to rot or grow mould.

2. Where does a vapour barrier go?

Vapor barriers are usually best installed on the side of the wall that experiences the hotter temperature and moister conditions: the inner surface in colder climates and the outer surface in hot, humid climates. In existing spaces, oil-based paints or vapor-barrier latex paints offer an effective moisture barrier.

3. What is the difference between DPM and vapour barrier?

While damp proof membranes are used under floors to stop damp rising up into the building, vapour control membranes prevent moisture from inside the building creeping into the walls and accumulating in the insulation cavities.

4. Do I need vapour barrier?

If you live in a mixed climate – hot and humid with several heating months in the winter, you probably need a vapor retarder. Specifically, if you live in climate zones 4C (marine), 5, 6, 7 and 8.

Editor's Notes

During our construction vapour barrier research, we found 32 construction vapour barrier products and shortlisted 10 quality products. We collected and analyzed 3,414 customer reviews through our big data system to write the construction vapour barriers list. We found that most customers choose construction vapour barriers with an average price of £20.00.

The construction vapour barriers are available for purchase. We have researched hundreds of brands and picked the top brands of construction vapour barriers, including Damplas, ASTON BUILDING SUPPLIES LTD, Just The Job Supplies, Trade Store, Tyvek.

Written by

Corey Phillips Avatar

Corey Phillips

Corey Philips is an electrician and lighting expert. He graduated from the University of Birmingham in 2012 with a Bachelor's degree in electrical and electronics engineering. Corey is a specialist contractor in lights. He sells and installs and recommends lights and lamp sheds, and other lights accessories. Aside from that, Corey is vast in installing and maintaining electrical appliances like air conditioners, water heaters, and the likes.