Breathable Vent Card

What is a breathable vent card?

A breathable vent card is a card that is permeable to water yet strong and rigid enough to support the insulation. It is also required to maintain a 50mm air gap between the roofing felt and insulation or membrane to allow water vapour to leave your building, so it must be long lasting.

Frequently asked questions

The most commonly asked questions are covered here. If you have any specific questions please do not hesitate to contact us by completing the form on the contact us page or calling our customer services team on (085) 144 3637.

A breathable vent card to require by Irish building regulations. “B.5.2.1R2(a) Insulation between and below rafters, 50 mm ventilated cavity between the insulation and breathable membrane” 2019 Part L Building Regs

The breathable vent card is placed in between your attic or loft rafters 50mm from the roofing felt, to allow water vapour to escape the structure. This is to prevent the buildup of harmful damp and mold to accumulate in the attic or loft. Water vapour is built up in any structure where humans breathe, sweat, shower or cook.

Counter battened roofs do not require a breathable vent card as an air gap is maintained on the outer side of the roofing felt. This means that the spray foam can be applied directly to the roofing felt. Always remember to ask your contractor to make sure that your roof has an air gap as damp and mold can damage your heatly and root wood of it is allowed to build up in your attic or loft.

what is a breathable vent card

All our contractors have been trained to install the vent cards.

Yes, we do, we use an open cell foam EZero E500 Foam NSAI Cert No. 11/0365.

nsai certificate


Spray foam Insulation dublin

Unique Breathable Vent Card

The breathable vent card system is developed to meet Irish building regulations which require that a 50mm air gap be maintained between the roofing deck or felt and the insulation material.

Open cell spray foam insulation is the best insulation to be used in a residential building as open cell foam is ‘breathable’ allowing moisture to escape the building while maintaining an airtight seal.

  • NSAI Agrément Certified Fully Breathable System
  • Better fire rating than any other comparable Open Cell spray foam made in Europe passed EN 13501-1 : (Bs1d0)
  • Insulation and perfect air seal in a single application.
  • Water blew formula Lower u value 0.0376 W/m2K
  • Seven times better air seal compared with traditional insulation.
  • Elimination of unplanned air-borne moisture movement and related condensation.
  • Energy savings of about 50% compared with conventional insulation.
  • Non Toxic product.