DuPont Tyvek Supro Breather Membrane (1m x 50m)

By DuPont · Model: Tyvek Supro · Building Materials

BBA-approved roofing and wall breather membrane providing weather protection while allowing moisture vapour to escape from the building structure.

BBA certified for use as a roofing underlay and wall breather membrane
High vapour permeability allows moisture to escape from structure
Windtight and watertight protection against driving rain
UV resistant for up to 4 months exposure during construction
Lightweight 50m roll for easy handling on site
Compatible with all common roofing and cladding systems

Overview

Tyvek Supro is the breather membrane that architects and builders specify when they want a product that genuinely performs. Its combination of high vapour permeability and weather resistance makes it suitable for both pitched roofing underlays and timber frame wall construction, where managing moisture movement is critical to building longevity.

In-Depth Look

Tyvek Supro has earned its reputation as the go-to breather membrane for UK construction. Whether used as a pitched roof underlay or a timber frame wall membrane, it delivers consistent performance that building control inspectors recognise and accept without question.

Why Breathable Membranes Matter

Traditional roofing felt (Type 1F sarking felt) is a low-permeability membrane that traps moisture vapour inside the roof structure. As insulation levels in UK buildings have increased under Part L, more moisture is driven upward into the roof void, raising the risk of condensation on the underside of the felt and the top surfaces of roof timbers. A breathable membrane like Tyvek Supro has a vapour resistance of only 0.13 MNs/g — highly permeable — allowing moisture vapour to escape from the structure while its W1 water classification prevents driving rain from penetrating inward.

BBA Certification

The BBA (British Board of Agrément) certificate is what separates premium membranes from generic alternatives in UK building practice. Building control inspectors accept BBA-certified products as compliant with Building Regulations without requiring additional evidence or calculations. Many structural timber frame manufacturers specify a BBA-certified membrane as a warranty condition. For self-builders and contractors who want zero friction at inspection, the BBA stamp on Tyvek Supro removes the risk of challenge.

Installation Guidance

Tyvek Supro is laid horizontally from eaves to ridge, with each course overlapping the course below by a minimum of 150mm. The laps should be sealed with Tyvek tape at joints to maintain the windtight layer. On wall applications, the membrane is fixed to the structural frame before the outer cladding is applied, with the laps taped as specified. The 4-month UV resistance provides a generous site tolerance between membrane installation and cladding completion.

Compliance

Tyvek Supro is CE-marked and complies with BS EN 13859-1 (underlays for discontinuous roofing) and BS EN 13859-2 (underlays for walls), covering both primary applications.

Verdict

Tyvek Supro is the breather membrane that professionals specify when the building needs to perform correctly for decades. The BBA certification removes doubt at inspection stage, and the cost premium over generic alternatives is negligible relative to the total build cost.

Specifications
Roll Size	1m x 50m (50m²)
Weight	112g/m²
Vapour Resistance	0.13 MNs/g (highly permeable)
Water Resistance	W1 classification
UV Exposure	Up to 4 months
Certification	BBA, CE marked

Who It's For

Roofers installing breathable underlays on pitched roofs
Timber frame builders needing a reliable wall breather membrane
Self-builders and renovators upgrading from traditional felt underlays

Pros & Cons

Pros

BBA certified — accepted by building control without question
High vapour permeability reduces condensation risk in roof and wall voids
4-month UV resistance gives extended weather protection during construction
DuPont brand recognition and consistent quality

Cons

Higher cost than generic breather membranes
1m width requires overlapping on wider rafter spacings
Overkill for simple garden buildings or non-habitable structures

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