DAFA DiFoil™

UseUse the DAFA DiFoil™ vapour barrier for thermal insulated building ele-ments where there is a risk of sum-mer condensation or other moisture on the external side of the vapour barrier. For example, well-insulated structures exposed to direct sun during the summer can achieve such a high difference in temperature between the outside and the inside that there is risk of condensation on the vapour barrier. This is a typical phenomenon in holiday homes that are empty for long periods. It is important that the foil's text side faces the warm side of the structure (as shown on the pictures).

The materialDAFA DiFoil™ consists of a polyeth-ylene (PE) rolled product coated with moisture-absorbent polypropylene (PP) insulation. The material can tolerate direct sunlight for a maxi-mum of three months and must not be exposed to direct contact with solvent-based wood preservatives.

DAFA DiFoil™ is a permeable vapour barrier used to prevent dry rot, mould and mildew, primarily in exterior walls and ceiling constructions. The vapour barrier allows periodic condensation moisture to move from one side of the material to the other, but is still tight enough to stop normal vapour pressure.

Using DAFA DiFoil™ as a vapour barrier in sunlit building elements and structures susceptible to build-ing moisture ensures effectiveness against mildew, mould and dry rot.

– for sustainable construction

Transport, delivery and storageRolled in a tube made from recy-cled cardboard, tightly packaged in PE foil. Must be transported and stored horizontally on a Europal-let. Storage must be protected against the weather and direct sunlight. Must only be stacked to a height of two pallets.

Technical specifications

Length 50 metres

Width 1.5 metres

Roll width 1.5 metres

Roll weight* 5 kg

Vapour tight-ness, Sd value

≥ 8 m

Fire classification E

Colour Grey

DAFA item number

620014525

EAN no. 5705636344676

Quality assuranceDAFA DiFoil™ is CE-marked according to EU standard PN-EN 13984:2006/A1:2007

GuaranteeDAFA DiFoil™ is covered by a 25-year product guarantee from delivery.

* Tol. +/- 30%

CO

NSTRUCTION TECHNOLO

GY

VAPOR BARRIER

warranty

years

Project planningIn the design of innovative and al-ternative structures, an assessment of the moisture conditions and structure must always be carried out in order to identify the correct vapour barrier solution.

Sealing abilityDAFA DiFoil™ belongs to the group of permeable vapour barriers. With an Sd value of ≥ 8 m, the vapour barrier can absorb/transport ap-prox. 7 g water per m² in 24 hours.

The Sd value's conversion factor to z value is approximately 5.7.

The vapour barrier must be placed no more than one-third of the way inside the total thermal insulation layer, measured from the warmest side of the insulation layer. The substrate for the ceiling cladding can be installed out-side the vapour barrier with suitable dimensions to enable electrical installa-tions, etc. to be carried out without too many conduits. When affixing DAFA DiFoil™ to absorbent surfaces, such as plaster, concrete or untreated wood, use DAFA foil adhesive.

General principle – Light exterior steel wall.1. Attach DAFA DiFoil™ to the surface of the steel with double-sided adhesive tape.2. If necessary, z profiles can be fitted with provi-sion for electrical installations, etc.

General principle – Sloping wall in wooden roof structure.1. Staple DAFA DiFoil™ to the wooden substrate.2. If necessary, boarding can be installed with provision for electrical installations etc.

Mount the vapour barrier foil with overlaps and tape with DAFA vapour barrier tape.

Installation

1

2

outside

inside

2

1outside inside

Use the complete DAFA Airstop System™ to ensure the tightness of critical conduits and building element transitions. See also www.dafa-as.com/airstop

A selection of other products in the DAFA Airstop System™

DAFA Airstop internal and ex-ternal corners

DAFA PE lining foil

DAFA universal pipe and cable collar

DAFA rafter shoe collar

DAFA blue and green vapour barrier tape

DAFA foil adhesive

DAFA PE plinth and sill foil

DAFA double-sided adhesive vapour bar-rier tape

DAFA DiFoil™

DAFA A/S • Holmstrupgaardvej 12 • DK-8220 Brabrand • Tel. +45 87 47 66 66 • E-mail dafa@dafa.dk • www.dafa-as.com

JANUARY 2011

ENVIRONMENTAL CERTIFICATE