Moisture Management for Suspended Timber Floor Construction
Many suspended timber floor constructions have discontinuous insulation between the joists. That leaves an opening to improve moisture management and airtightness – by fitting a Tyvek® membrane and carefully sealing the gaps and joints.
Tyvek® membranes are ideal for suspended timber floor construction. They are vapour-open, yet greatly reduce air flow when correctly installed. This helps to minimise underfloor condensation (and hence the risk of mould or decay) while improving the thermal efficiency of your floor and building.
Achieving Airtightness
Tyvek® Supro membranes are sturdy and durable. They provide adequate support for the insulation, and are recommended for use in suspended timber floor constructions. To achieve optimal airtightness in suspended timber floor construction, however, it is important to fit them methodically. Airtightness can only be achieved if the membrane is laid continuously with sealed laps.
Full Range of Accessories
DuPont has a full range of top quality tapes and accessories to help you achieve optimal airtightness. Click here for details:
Membrane Selection Guide 
Find the right products with the Membrane Selection Guide for DuPont™ Tyvek® and AirGuard™ products.
Featured
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Free CPD Seminars
DuPont™ Tyvek® offers free CPD seminars for architects and other construction professionals covering energy efficiency and building protection.
DUPONT PRODUCTS & SERVICES
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Tyvek® Supro
Tyvek® Supro is the market-leading breather membrane, and is a water resistant membrane suitable for all supported and unsupported pitched roof applications in commercial and residential buildings.
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All Tyvek® breather membrane products
A complete listing of all Tyvek® breather membrane products
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AirGuard® Reflective E
AVCL which boosts your thermal efficiency
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AirGuard® Reflective
DuPont™ AirGuard® Reflective is a low emissivity internal vapour barrier that combined with an airgap can enhance thermal comfort by reflecting up to 95% of radiant heat back into the building.
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Tyvek® AirGuard® Smart
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AirGuard® Control
DuPont™ AirGuard® Control is a tough, transparent vapour control barrier that improves airtightness by reducing convective heat loss and air leakage while also minimising the risk of condensation in roof and wall insulation.
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Tyvek® Plastering Tape
A high performance airtight and moisture adaptive carrier tape that can be rendered. It seals difficult areas like windows, doors and timber to block connections – 1 product that fits application outside and inside.
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Tyvek® Double-sided Tape
DuPont™ Tyvek® Double-sided Tape is an advanced sealer tape that bonds all Tyvek® membranes to smooth surfaces, and seals membrane overlaps effectively.
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Tyvek® Butyl Tape
DuPont™ Tyvek® Butyl Tape provides a moisture- and airtight seal between Tyvek® breather membranes or AirGuard® AVCLs and a wide range of materials.
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AirGuard® Tape
High performance airtight vapour control layer overlap tape, that is very flexible, hand-tearable with a very high tack that sticks on all smooth or rough surfaces such as PE films, spun-bond, wood or PVC.
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AirGuard® Sealant
An adhesive sealant for permanently elastic, airtight bonding of joints and structural connections as well as connections of vapour control layers to surfaces such as stone. It provides excellent adhesion to most surfaces such as stone, concrete, plaster, plasterboards and wood.
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Tyvek® Primer
Transparent primer that is permanently tacky after curing and with very fast curing time.
DUPONT BRANDS
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AirGuard®: Vapour Control Layer Solutions
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Webinar: Design Air-tight, Condensation Free Buildings
With the trend towards greater energy efficiency in buildings, as driven by Building Regulations, air tightness plays a vital role in meeting these standards. While in the past little or no attention was paid to airtightness, in recent years it has come become clear how much air tightness can contribute to the energy balance of a building.
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Tyvek® Sealing Tape
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Tyvek® Breather Membrane Solutions
CASE STUDIES
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Tyvek® Supro at the Jamaica Inn: Reliable resistance for a windswept cultural icon
The famous Jamaica Inn is situated 280metres above sea level on Bodmin moor. The roof of its new accommodation extension benefits from advanced breather membrane Tyvek® Supro, which is fully compliant with BS5534:2014
INFORMATION & IDEAS
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How to – Vapour control and vapour barrier installation
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How to - Install vapour control and vapour barrier membrane on down lights and ceiling hatches
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How to - Fixing the vapour barrier and vapour control membrane – timber, concrete and steelwork
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How to - Selecting the right vapour control and vapour barrier sealing tape for the job
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Tape selection guide
Find the right Tyvek® and AirGuard® tapes and adhesive accessories for your application with our selection guide.
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Technical Library
Find here all the technical information about DuPont™ Tyvek® & DuPont™ AirGuard®.
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Free CPD Seminars
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Building In Energy Efficiency
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Give Home Energy Efficiency a Boost
DuPont™ Tyvek® solutions can significantly improve home energy efficiency. The combination of low-emissivity, vapour-open Tyvek® Reflex and AirGuard® Reflective is particularly effective.
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Tyvek® offers unrestricted application when tested in accordance with BS5534:2014
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Tyvek® is compliant to New BS5534 Annex A
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Underlayment: Quality and Thickness of Functional Layers Are Critical
Tyvek® membranes are proven to resist ageing better than most common multi-layer underlayments. Even after prolonged exposure to UV radiation and heat, Tyvek® underlayment stays watertight and provides superior condensation control.