A 100% airtight vapour control layer with extreme variable vapour resistance which prevents structural damage and loss of insulation efficiency by adapting to moisture conditions and regulating the humidity in building elements.

Features and benefits:

Reduced drying out time, with additional drying capacity for unplanned humidity infiltration.
Extends the durability, health and longevity of buildings.
Greater energy efficiency and enhanced interior comfort.
Vapour resistance ranges from 1 MNs/g to 182 MNs/g.
Allows trapped moisture within a structure to escape.
Excellent values in volatile organic compounds testing, has been tested according to the ISO 16000 evaluation scheme.
Durable against alkali hence compatible with mortar and concrete surfaces.
Can be used in renovation on the outside: water column (to EN 20811) is 3 m.
CE marked to EN 13984.
Tyvek® AirGuard® Smart (dupont.co.uk)

Extract from the BBA certificate (please download the full certificate for reference):

KEY FACTORS ASSESSED

Condensation — the product will reduce the risk of interstitial condensation (see section 6).

Airtightness — the product is an air barrier and can reduce heat loss by air infiltration (see section 7).

Strength — the product has adequate strength to resist damage during installation (see section 8).

Properties in relation to fire — the membrane is classified as E in accordance with EN 13501-1:2007 and its use is restricted in some cases by the national Building Regulations (see section 9).

Durability — the product will have a lifetime equal to that of the building element in which it is installed (see section 11).

NHBC Standards 2021

In the opinion of the BBA, DuPont™ Tyvek® AirGuard® Smart, if installed, used and maintained in accordance with this Certificate, can satisfy or contribute to satisfying the relevant requirements in relation to NHBC Standards, Chapters 6.2 External timber framed walls, 6.9 Curtain walling and cladding, 6.10 Light steel framed walls and floors, 7.1 Flat roofs, terraces and balconies, 7.2 Pitched roofs and 9.2 Wall and ceiling finishes.

In NHBC projects where the product is used in conjunction with a vapour-closed insulation, a diffusion-open membrane must be used on the cold side of the insulation.

4 Use

4.1 TYVEK AirGuard Smart is satisfactory for use as an AVCL for the building envelope in new-build and refurbishments in domestic and non-domestic buildings up to and including humidity class 3, in the following specifications:

at the rafter line in slated or tiled pitched timber warm roof constructions in conjunction with an HR or LR underlay;
at ceiling level in warm pitched roof constructions;
at ceiling level in slated or tiled pitched ventilated cold roof constructions;
in walls in timber, masonry and steel-frame constructions;
ground bearing floors (insulation above floor slab, damp proof membrane below);
suspended floors; and
conventional flat roofs.